How to Prevent Condensation in Garage Conversions in Brighton and Hove
A garage can appear completely dry before conversion and then develop condensation or mould after it becomes a heated room.
That does not necessarily mean water has suddenly started entering through the walls.
The environment inside the building has changed.
Before conversion, a garage may be:
Before conversion, a garage may be:
- Unheated
- Draughty
- Lightly occupied
- Used mainly for storage
- Poorly insulated
After conversion, the same space may become:
After conversion, the same space may become:
- Heated
- Insulated
- More airtight
- Regularly occupied
- Connected to the rest of the house
People then introduce moisture through normal occupation, while insulation and new windows change surface temperatures and air movement.
Preventing condensation therefore requires the insulation, heating, ventilation and moisture behaviour of the building to be considered together.
Government ventilation guidance specifically treats adequate ventilation as necessary for controlling indoor pollutants and excess moisture, while Historic England warns that changing insulation, airtightness, heating or ventilation in traditional construction can alter the building's moisture balance.
What Is Condensation?
Air contains water vapour.
When humid air encounters a sufficiently cold surface, some of that water vapour can condense into liquid water.
In a garage conversion this might appear as:
In a garage conversion this might appear as:
- Water on windows
- Damp corners
- Black mould
- Damp window reveals
- Mould behind furniture
- Moisture around external-wall junctions
- Damp patches near ceilings
The visible moisture may therefore have originated inside the room rather than passing through the wall from outside.
Condensation Is Different From Penetrating Damp
This distinction is important.
Condensation
Moisture originates principally from water vapour within the internal environment and condenses where conditions allow.
Penetrating Moisture
Water enters through defects such as:
- Roof leaks
- Failed render
- Cracked masonry
- Defective gutters
- Poor window detailing
Ground-Related Moisture
Moisture may interact with:
- Floor construction
- External ground levels
- Below-ground walls
These different mechanisms require different responses.
Do not assume every damp patch in a converted garage is condensation.
Equally, do not assume every damp patch means water is passing through the wall.
Why Garage Conversions Can Develop Condensation
Conversion changes the way the space performs.
An old garage may have had considerable uncontrolled air leakage through:
- Garage door
- Gaps
- Roof
- Windows
That is not an efficient ventilation strategy, but it can mean moisture rarely accumulates internally. During conversion you may install:
During conversion you may install:
- New insulated wall
- Double-glazed window
- New door
- Wall insulation
- Roof insulation
- Insulated floor
At the same time, the room becomes occupied.
That can increase internal moisture while reducing uncontrolled ventilation.
Historic England specifically warns that increasing airtightness without ensuring adequate ventilation can increase condensation risk.
Four Things Need to Work Together
A good condensation strategy considers four main factors:
- 1Moisture generation
- 2Surface temperature
- 3Ventilation
- 4Heating
Focusing entirely on any one of these can miss the wider cause. For example:
More insulation without adequate ventilation
can still result in high internal humidity.
More ventilation without adequate heating
can still leave very cold surfaces.
More heating without moisture removal
can increase the amount of water vapour that the air carries.
The building needs to work as a system.
1. Control Moisture Generation
Everyday activities introduce moisture into a home.
Examples include:
- Showering
- Cooking
- Drying clothes
- Breathing
- Washing
A garage converted into an ordinary office will usually create less moisture than one containing:
A garage converted into an ordinary office will usually create less moisture than one containing:
- Shower room
- Utility
- Washing machine
- Kitchenette
The room use therefore matters when the ventilation system is designed.
2. Keep Internal Surfaces Warm Enough
Insulation can increase the temperature of internal surfaces.
That can reduce the likelihood of warm humid air reaching a sufficiently cold surface for condensation to form.
But insulation has to be:
But insulation has to be:
- Correctly designed
- Appropriate to the existing wall
- Installed continuously
- Properly detailed at junctions
Simply placing insulation over the largest flat areas while leaving cold bridges around the edges can relocate the condensation problem rather than solve it.
3. Provide Appropriate Ventilation
Ventilation removes moisture generated inside the building.
Approved Document F provides the statutory guidance framework for ventilation in dwellings and specifically incorporates checks for condensation and mould as indicators that ventilation may be inadequate.
A garage conversion should therefore have a ventilation strategy rather than relying accidentally on gaps around the old garage door.
4. Provide Appropriate Heating
A room intended for occupation needs a sensible heating strategy.
Heating affects:
- Air temperature
- Surface temperature
- Relative humidity
- Comfort
A cold converted garage used intermittently can develop different moisture conditions from a room maintained at a reasonably stable temperature.
Large rapid fluctuations in temperature can also influence moisture behaviour, particularly in traditional construction. Historic England notes that heating changes affect evaporation and the subsequent potential for condensation.
What Is a Thermal Bridge?
A thermal bridge is an area where heat passes through the building envelope more readily than through surrounding construction.
In a garage conversion, common locations can include:
In a garage conversion, common locations can include:
- Floor-to-wall junction
- Roof-to-wall junction
- Window reveals
- Garage-door infill junctions
- Structural elements
- Corners
These areas can become colder than the surrounding wall.
If humid internal air reaches them, condensation or mould may occur even though the rest of the room appears dry.
Garage-Door Infill Junctions
The former garage-door opening deserves particular attention.
The new wall may be modern insulated construction, while the original walls either side are older and colder.
This creates a junction between two different constructions.
The detail should consider:
- Insulation continuity
- Damp protection
- Window reveals
- Floor junction
- Existing wall
The new wall itself might perform very well while the narrow strips where it joins the old garage remain the coldest surfaces in the room.
Window Reveals
Window reveals are common locations for condensation because there is limited space around the frame for insulation.
Poor detailing can create:
- Cold reveal surfaces
- Mould around corners
- Condensation near the frame
The window specification and wall insulation should therefore be considered together.
Simply buying a high-performance window does not guarantee that the surrounding wall junction performs equally well.
Corners
Corners can have lower surface temperatures because of their geometry and reduced air movement.
They are also common locations for furniture.
That combination can create ideal conditions for mould:
That combination can create ideal conditions for mould:
- Cold surface
- Humidity
- Limited airflow
Persistent mould in one corner does not necessarily mean water is entering through that corner externally.
The complete moisture pattern should be investigated.
Furniture Against External Walls
Large furniture placed tightly against an external wall can restrict air circulation.
Examples include:
- Wardrobes
- Sofas
- Cabinets
- Desks
The surface behind them may remain cooler and receive less warm room air.
This can contribute to localised mould.
Allowing some air movement can help, although recurring condensation still deserves investigation of the overall insulation, heating and ventilation strategy.
Garage Conversion Wall Insulation
The correct insulation approach depends on what the garage walls are made from.
Possible walls include:
Possible walls include:
- Modern cavity masonry
- Single-skin brick
- Blockwork
- Solid brick
- Bungaroosh
- Flint
- Mixed traditional masonry
The same internal lining should not automatically be specified for all of them.
Internal Wall Insulation
Internal insulation can improve comfort and thermal performance.
However, it also changes the temperature and moisture conditions within the existing wall.
Historic England's current guidance warns that unsuitable insulation applied to traditional construction can hinder drying and create moisture accumulation within the building fabric.
For traditional walls, insulation therefore needs to be approached as a hygrothermal change to the wall, not simply as extra material fitted behind plasterboard.
Do Not Insulate a Wet Wall Without Understanding Why It Is Wet
Before installing internal insulation, investigate:
- Roof leaks
- Failed render
- Cracking
- Gutters
- Downpipes
- External ground levels
- Drainage
If the wall is being repeatedly wetted from outside, hiding it behind insulation is unlikely to be a satisfactory long-term solution.
Historic England's joint guidance on traditional buildings recommends understanding moisture sources alongside ventilation, heating and insulation before specifying remedial work.
Bungaroosh and Condensation
Bungaroosh can form part of older Brighton garages or the original house beside them.
It is not inherently a cause of condensation.
The issue is how the traditional wall interacts with:
The issue is how the traditional wall interacts with:
- External moisture
- Internal insulation
- Heating
- Ventilation
- New finishes
If bungaroosh is defective, repair it first.
If it is sound, the insulation and finish should be selected with its moisture behaviour in mind.
Do Bungaroosh Walls Need to "Breathe"?
The phrase is widely used but technically imprecise.
Walls do not breathe in the biological sense.
What matters includes:
What matters includes:
- Water-vapour movement
- Liquid moisture transport
- Evaporation
- Material porosity
- Drying potential
Traditional materials often interact with moisture differently from dense modern assemblies.
Historic England describes heat and moisture transfer through traditional construction as interdependent hygrothermal behaviour governed by both materials and the surrounding environment.
For Safe-Bricks, the practical question is therefore not simply: Is this breathable? It is: How will this complete wall receive, move and release moisture after the conversion?
Lime Does Not Automatically Prevent Condensation
Using lime plaster does not remove the need for:
- Insulation design
- Ventilation
- Heating
Lime-based finishes can be appropriate for particular traditional substrates.
But a cold room with excessive internal humidity can still experience condensation.
Material compatibility and indoor environmental control are related but separate issues.
Cement Does Not Automatically Cause Condensation Either
The reverse simplification is also unhelpful.
Finding cement render does not prove it caused the condensation.
Assess:
Assess:
- Wall construction
- Render condition
- Exposure
- Internal insulation
- Ventilation
- heating
A sound modern garage wall with an appropriate cementitious render system may perform perfectly well.
The specification needs to follow the building.
External Rainwater Still Matters
Condensation should not distract from external maintenance.
A wall repeatedly wetted by:
- Leaking gutter
- Cracked render
- Defective roof
- Failed window seal
may become colder and harder to dry.
That can complicate the internal moisture environment.
Repair external water-entry defects before relying on internal environmental changes alone.
Coastal Exposure
Brighton and Hove's coastal environment can subject buildings to substantial wind-driven rain exposure.
That is principally an external moisture issue rather than condensation itself.
But a persistently wetter external wall can influence:
But a persistently wetter external wall can influence:
- Internal surface temperature
- Drying
- moisture conditions
The exterior envelope should therefore remain weather-resistant.
Floor Condensation
The floor can also become a cold surface.
A former garage slab may have had little or no insulation because the building was never designed as normal living accommodation.
If the floor remains significantly colder than the room, it can affect:
If the floor remains significantly colder than the room, it can affect:
- Comfort
- Surface temperature
- Junction conditions
The garage conversion Building Regulations design should therefore consider the floor alongside the walls and roof.
Approved Document C addresses resistance to moisture in floors, walls and roofs.
Floor-to-Wall Junctions
This is one of the details most likely to be forgotten.
Suppose:
Suppose:
- Floor is insulated
- Wall is insulated
but the junction between them contains a strip of original cold masonry.
That small area may become the coldest surface in the room.
Thermal continuity needs to be considered through the complete detail.
Roof Condensation
Roof spaces can also experience condensation.
The correct strategy depends on the roof construction.
Possible garage roofs include:
Possible garage roofs include:
- Cold pitched roof
- Flat roof
- Warm roof
- Room above
Roof insulation and ventilation should be designed together.
Historic England's current roof guidance specifically notes that adequate ventilation of cold roof spaces can reduce condensation risk.
Do Not Randomly Add Insulation Below a Flat Roof
Changing the insulation arrangement of a flat roof changes temperature distribution through the construction.
That can affect where condensation might occur within the build-up.
The roof should therefore have a defined construction specification rather than simply filling available voids with insulation.
Surface Condensation vs Interstitial Condensation
There are two important concepts.
Surface Condensation
Moisture forms on the visible internal surface.
Examples:
Examples:
- Window
- Wall corner
- Ceiling
Interstitial Condensation
Moisture forms within layers of the building construction.
This can be more difficult to detect because it may occur behind:
This can be more difficult to detect because it may occur behind:
- Plasterboard
- Insulation
- Membranes
The design therefore needs to consider not only what the room surface looks like but how the complete build-up behaves.
Why Interstitial Condensation Matters
Moisture accumulating inside a construction can potentially affect:
- Timber
- Insulation
- finishes
- masonry
without immediately producing visible surface water.
This is one reason wall and roof insulation details should follow an appropriate technical specification rather than being improvised on site.
Vapour Control Layers
Some modern constructions use designed vapour-control layers as part of the moisture strategy.
Whether one is appropriate depends on:
- Wall or roof construction
- Insulation system
- Position of materials
It should not be installed indiscriminately.
In traditional buildings, the complete drying strategy needs considering before introducing highly vapour-resistant layers.
Airtightness and Ventilation
Reducing unwanted air leakage can improve energy efficiency and comfort.
But airtightness and ventilation are not interchangeable.
A well-designed room can be relatively airtight and properly ventilated.
The ventilation should be intentional.
Historic England warns that increasing airtightness without corresponding ventilation can raise condensation risk in older buildings.
Trickle Ventilators
Depending on the applicable ventilation strategy and Building Regulations standard, background ventilators in windows may form part of the ventilation provision.
Do not decide whether to include them purely on aesthetic preference.
The complete ventilation strategy should determine:
- Whether they are required
- Where ventilation is provided
- How the room integrates with the rest of the dwelling
Approved Document F provides the relevant statutory guidance.
Opening Windows
Opening windows can provide useful purge ventilation.
But a Building Regulations ventilation strategy should not generally depend solely on the homeowner remembering to open a window whenever internal humidity rises.
The permanent ventilation provision should be designed appropriately for the dwelling and room use.
Mechanical Ventilation
Some garage conversions require mechanical extraction.
This is particularly relevant where the conversion contains:
- Shower
- Bathroom
- Utility room
- Other moisture-producing uses
The extract system should discharge appropriately rather than simply moving moisture into an enclosed:
The extract system should discharge appropriately rather than simply moving moisture into an enclosed:
- Roof void
- Wall cavity
- Floor void
Garage Conversion Bathrooms
Adding a shower dramatically changes moisture production within the conversion.
The design then needs to coordinate:
- Waterproofing
- Heating
- Mechanical extraction
- Background ventilation
- drainage
Do not specify the ventilation as though the garage remains an ordinary bedroom or office.
Utility Rooms
A garage converted partly into a utility can also produce more moisture.
Consider:
- Washing machine
- Tumble dryer
- Wet laundry
- Sink
Drying clothes internally can introduce substantial moisture to the indoor environment.
The ventilation strategy should follow the actual use.
Tumble Dryers
Where a tumble dryer requires external discharge, its ducting should be installed correctly.
Where a different type of appliance is used, follow the manufacturer's ventilation and installation requirements.
Do not allow moisture-producing appliances to discharge uncontrolled moisture into the converted room.
Home Offices
A home office generally produces much less moisture than a bathroom or utility room.
But condensation can still occur where:
- Heating is intermittent
- External walls remain cold
- Ventilation is limited
- Furniture blocks airflow
The solution still needs to address the actual pattern rather than assuming low-moisture use makes condensation impossible.
Bedrooms
A garage converted into a bedroom is occupied for long periods.
People release water vapour simply through normal occupation.
The room therefore needs:
The room therefore needs:
- Appropriate ventilation
- Suitable thermal performance
- Effective heating
A bedroom should not depend on a portable dehumidifier to function normally.
Heating Intermittently
A converted garage used occasionally as an office or gym may be allowed to become cold and then heated rapidly before occupation.
This can create substantial temperature swings.
More stable environmental conditions can sometimes reduce the likelihood of repeated cold surfaces and moisture cycling.
Historic England notes that changes in heating patterns can alter evaporation and condensation behaviour in traditional building fabric.
Radiator Position
Heating position can influence internal temperature distribution.
Avoid designing the room so that significant external-wall areas remain consistently cold while the thermostat sits in a much warmer location.
The overall heat-loss calculation and room layout should determine the heating provision.
Underfloor Heating
Underfloor heating can provide relatively even heat distribution.
It may be particularly useful where:
- Wall space is limited
- Garage floor is already being rebuilt
But it still needs:
But it still needs:
- Appropriate insulation
- Correct floor build-up
- ventilation
Underfloor heating is not a substitute for the rest of the moisture strategy.
Mould Around Windows
If mould develops mainly around the window, investigate:
- Reveal temperature
- Insulation continuity
- Ventilation
- internal humidity
- seal condition
Do not simply apply mould-resistant paint repeatedly.
The recurring pattern may indicate a colder local surface or insufficient moisture removal.
Mould Behind Furniture
If mould occurs exclusively behind:
- Wardrobe
- Sofa
- Cabinet
restricted air circulation may be contributing. But check whether that wall also has:
But check whether that wall also has:
- insulation gap
- external defect
- unusually cold surface
The furniture may be revealing the problem rather than causing the entire problem.
Mould at Ceiling Corners
This can indicate a colder junction where:
- Roof insulation
- Wall insulation
meet. Inspect insulation continuity before assuming the problem is simply poor housekeeping.
Black Mould
Black mould indicates that conditions have allowed fungal growth.
Cleaning the visible mould can be necessary.
But unless the environmental conditions that supported the growth are changed, it may return.
Those conditions can involve combinations of:
- Humidity
- cold surfaces
- ventilation
- heating
The underlying cause should therefore be addressed.
Mould-Resistant Paint
Specialist paint can help resist surface mould growth in some situations.
It should not be used as a substitute for correcting:
- Persistent condensation
- Cold bridging
- inadequate ventilation
- external leakage
Paint is the final surface treatment.
The building beneath it still needs to function properly.
Dehumidifiers
A dehumidifier can be useful for:
- Temporary drying
- Managing unusual short-term moisture loads
- Investigation
It should not normally be the only thing making a newly converted room habitable.
If the conversion requires permanent dehumidification simply to prevent mould under normal occupation, the underlying environmental design deserves investigation.
Relative Humidity
A simple humidity monitor can provide useful information about the internal environment.
It can help identify:
- Whether humidity rises significantly during occupation
- Whether ventilation lowers it
- Whether a moisture problem follows particular activities
Like a moisture meter, it provides evidence rather than a complete diagnosis.
The building fabric and conditions still need to be considered.
Moisture Meters
A handheld masonry moisture reading cannot by itself determine whether a patch is caused by:
- Condensation
- Rain penetration
- Ground moisture
- Salts
- Plumbing
Historic England's joint position statement on moisture investigation recommends a holistic approach that understands building construction, moisture sources, ventilation, heating and insulation rather than relying on isolated measurements.
Condensation Immediately After Construction
A newly converted garage may temporarily contain additional construction moisture from:
- Plaster
- Screed
- Mortar
- Concrete
That moisture has to leave the building. Do not confuse temporary drying moisture with a permanent design failure without considering:
Do not confuse temporary drying moisture with a permanent design failure without considering:
- Construction stage
- material drying
- ventilation
- heating
Likewise, do not automatically assume persistent mould months later is merely the building still drying.
The pattern and conditions need investigating.
Drying New Construction
Traditional and modern wet materials should be allowed appropriate curing and drying.
Historic England's drying guidance favours controlled, generally gradual drying and notes that ventilation can play an important role.
Do not attempt to force all moisture out instantly through extreme heating.
Condensation After New Windows
A common pattern is:
- 1Old draughty garage door removed.
- 2New insulated wall and double-glazed window installed.
- 3Air leakage decreases.
- 4Internal humidity rises.
- 5Condensation appears somewhere else.
The new window did not necessarily cause damp.
The building's ventilation characteristics changed.
That change should have been accounted for in the design.
Why Better Windows Sometimes Collect Less Condensation
High-performance glazing tends to have a warmer internal glass surface than poor glazing.
This can reduce condensation on the glass itself.
But if room humidity remains high, condensation may instead become visible on the next-coldest surface such as:
But if room humidity remains high, condensation may instead become visible on the next-coldest surface such as:
- Reveal
- external corner
- wall-to-ceiling junction
This is why simply eliminating water from the window does not prove the moisture problem has disappeared.
Do Not Block Designed Ventilation
Once the room is occupied, do not routinely:
Once the room is occupied, do not routinely:
- Block background ventilators
- Disable extract fans
because they create a slight draught or noise.
If the system causes comfort problems, investigate the design or commissioning rather than permanently defeating the ventilation provision.
Check Extract Fans
Mechanical ventilation requires maintenance.
Depending on the system, check:
- Grilles
- filters
- ducts
- fan operation
A system that no longer moves the intended amount of air cannot provide the ventilation assumed when the room was designed.
Current Building Regulations Position in August 2026
A new 2026 edition of Approved Document F has already been published.
However, the associated 2026 Building Regulations changes generally come into force for ordinary non-higher-risk building work on 24 March 2027, subject to transitional provisions. Earlier versions continue to apply to work falling under previous regulatory standards.
A garage conversion being designed in 2026 should therefore use the ventilation standard actually applicable to that project rather than assuming the newest publication date automatically determines compliance.
Traditional Buildings Need Particular Care
Historic England advises that traditional building performance depends on interactions between:
- Building fabric
- External environment
- Heating
- Ventilation
- Occupation
and that energy-efficiency measures can change those relationships.
This is particularly relevant where a garage conversion adds modern insulation directly beside an older Brighton wall.
The traditional wall should not be treated as though it is simply defective modern cavity construction.
A Typical Older Brighton Conversion
A common Brighton garage combines four quite different constructions in one small room:
- Side wall: original bungaroosh
- Front: new insulated masonry replacing the garage door
- Floor: new insulated build-up
- Roof: upgraded modern system
Those four elements have very different thermal and moisture characteristics.
A good conversion resolves the junctions between them rather than forcing one generic detail across every surface.
Should You Remove Cement Render Before Conversion?
Not automatically.
Assess:
Assess:
- Is it cracked?
- Is water getting behind it?
- Is masonry deteriorating?
- Is it significantly affecting drying?
- Would removal damage the wall?
If the render is sound and the wall is performing acceptably, wholesale removal may be unnecessary.
If it is demonstrably contributing to deterioration, removal and replacement may be justified.
The decision should follow evidence.
Should You Use Lime Plaster?
Possibly, where the substrate and intended wall performance justify it.
An original traditional wall may be suitably repaired using lime.
A new insulated stud lining may appropriately use modern plasterboard.
A shower area may require a dedicated waterproof backing system.
Different parts of one conversion can legitimately use different materials.
Preventing Condensation: Design Checklist
Before the garage is converted, check:
Existing Building
- Roof is watertight
- External render or masonry is sound
- Gutters and drainage work correctly
- Ground levels are appropriate
- Existing moisture problems have been investigated
Floor
- Moisture strategy established
- Insulation designed
- Wall junction resolved
Walls
- Construction identified
- Defects repaired
- Insulation appropriate
- Thermal bridges considered
Roof
- Construction identified
- Insulation correctly designed
- Roof ventilation or moisture strategy resolved
Windows
- Suitable performance
- Reveal insulation considered
- Required ventilation incorporated
Heating
- Appropriate heat output
- Controls planned
- System integrated with room use
Ventilation
- Permanent strategy designed
- Background ventilation addressed
- Purge ventilation addressed
- Mechanical extraction provided where necessary
Occupation
- Room use established
- Bathroom or utility moisture loads accounted for
Condensation prevention is most successful when these decisions are made before the room is plastered.
The Mistakes That Cause Most Problems
Nearly every condensation problem we are called to in a converted garage traces back to one of these:
- Insulating and sealing the room without designing any ventilation to replace the old garage draughts
- Insulating the flat areas but leaving cold edges, corners, reveals and floor junctions
- Assuming mould on an external wall proves penetrating damp, or that low-level staining proves rising damp
- Covering existing damp or unrepaired bungaroosh with insulation before investigating it
- Adding an extract fan, mould paint or a dehumidifier after the problem appears, instead of designing the room properly
Each of these is a design decision made before plastering, which is why the strategy has to be settled at that stage.
If Condensation Has Already Appeared
A sensible investigation sequence is:
- 1Identify where condensation or mould occurs.
- 2Record when it occurs.
- 3Check room humidity.
- 4Check heating patterns.
- 5Check ventilation.
- 6Inspect extract systems.
- 7Inspect insulation junctions where possible.
- 8Check external walls, roof and ground for water defects.
- 9Identify the wall construction.
- 10Distinguish surface condensation from other moisture sources.
- 11Correct the underlying cause.
- 12Allow affected materials to dry appropriately.
- 13Clean and reinstate finishes once conditions are controlled.
Do not start by assuming the final remedial product.
Condensation vs Water Leak: Useful Clues
Patterns can provide clues.
More Consistent With Condensation
- Mould in corners
- Condensation on windows
- Problems behind furniture
- Worse during colder weather
- Humidity-related pattern
More Consistent With Water Penetration
- Localised staining beneath roof defect
- Damage following rain
- Defined patch around window leak
- Saturation beside cracked render
These are clues rather than definitive diagnoses.
Buildings can also have more than one moisture source at the same time.
Safe-Bricks' Approach to Condensation Prevention
For a Brighton garage conversion, our preferred sequence is:
- 1Inspect the existing garage.
- 2Identify wall, floor and roof construction.
- 3Investigate any existing moisture.
- 4Repair active external defects.
- 5Design the floor build-up.
- 6Design wall insulation according to substrate.
- 7Design roof insulation appropriately.
- 8Resolve thermal bridges.
- 9Plan windows and reveals.
- 10Plan heating.
- 11Design the ventilation strategy.
- 12Account for the intended room use.
- 13Complete first-fix services.
- 14Inspect insulation before covering.
- 15Complete plastering and finishes.
- 16Allow construction moisture to dry appropriately.
- 17Test heating and ventilation.
- 18Monitor unusual moisture patterns after occupation where necessary.
The goal is not simply to prevent visible mould.
It is to create a room whose thermal, ventilation and moisture performance works as a complete system.
Garage Conversion Condensation in Brighton and Hove
Safe-Bricks undertakes complete garage conversions throughout Brighton and Hove.
Our work can include:
- Existing-building investigation
- Bungaroosh repairs
- Traditional masonry repair
- Garage-door infill
- Floor upgrading
- Insulation
- Thermal-junction detailing
- Heating and services
- Ventilation coordination
- Plastering
- Decoration
- Bathrooms and utility spaces
More Garage Conversion Guides
More garage conversion guides are available:
Concerned About Condensation in a Garage Conversion?
If you are planning a conversion or already have condensation and mould in a converted garage, send Safe-Bricks photographs showing:
- Complete room
- External elevations
- Window and reveals
- Floor-to-wall junctions
- Mould or condensation
- Furniture positions where relevant
- Roof or ceiling
- Existing ventilation
- External ground levels
- Render or masonry
- Exposed wall construction where available
Also tell us:
Also tell us:
- What the room is used for
- How it is heated
- What ventilation is installed
- When the condensation appears
- Whether the problem changes after rain
This helps distinguish between a ventilation or thermal problem and moisture entering from another source.
Where further investigation is required, the next step should be based on the actual building rather than automatically prescribing damp-proofing treatment.
Not sure where to start?
Send us photographs of the area of concern. It is the most straightforward first step — we will look at what you can see and advise on the appropriate next steps.