Home Extension Plan – Learn Before You Build
Everything You Need to Know to Plan a Stress-Free Extension That Adds Value
Thinking of extending your home? Whether it’s to gain an extra bedroom, open up your kitchen, or add that much-needed home office, the first and most important step is creating a home extension plan that actually works.
Without the right plan in place, even the best intentions can lead to delays, budget blowouts, or planning rejections. That’s why we’ve created this no-nonsense guide to help you understand what goes into a proper extension—from design and regulations to finding the right builders and avoiding common mistakes.
If you’ve been searching for home extension builders near me, read this first—it could save you thousands and weeks of stress.
What Is a Home Extension Plan?
A home extension plan is more than just a set of drawings. It’s the complete roadmap that outlines:
What you want to build (e.g. single-storey rear extension, wraparound, loft extension)
How it will affect your current structure
Budget ranges and timelines
Permissions you’ll need
Who will carry out the work
How you’ll live in the home during the build
Whether you’re planning a small utility room or a full rear home extension, this plan sets the tone for everything that follows.
Step 1: Define the Purpose and Budget
Start by asking:
What problem is this extension solving?
More space? Better light? Higher resale value?
Once you know the “why,” the “what” becomes clearer. From there, work out your realistic budget range, including a 10–15% contingency for unexpected costs.
Remember, rear home extensions often cost more than you think once structural support, steelwork, and finishes are factored in. A solid plan avoids surprises later.
Step 2: Get a Measured Survey and Feasibility Check
Before speaking to builders, get a measured survey done. This helps your designer or architect create accurate floor plans. Then, work with professionals who can confirm feasibility—especially if you're on a tight site, in a conservation area, or dealing with complex ground levels.
Safe-Bricks Limited offers feasibility assessments for home extension plans in Brighton & Hove, helping you avoid design ideas that are likely to get rejected or cause problems on site.
Step 3: Understand the Types of Rear Home Extensions
Rear home extensions are among the most popular in the UK. Here are three common options:
1. Single-Storey Rear Extension
Perfect for creating an open-plan kitchen diner, utility room, or play area. It typically extends 3–6 metres out from the rear of the house.
2. Wraparound Extension
Combines a side return and rear extension. More complex but ideal for creating a large, light-filled family space.
3. Double-Storey Rear Extension
Adds space above and below—ideal for an extra bedroom or bathroom upstairs. Requires more planning and structural consideration.
The right option depends on your goals, budget, and site conditions—which is why a detailed home extension plan is crucial from day one.
Step 4: Planning Permission or Permitted Development?
Many small extensions fall under Permitted Development (PD), meaning you might not need full planning permission. However, you’ll still need Building Regulations approval and structural calculations.
If your project doesn’t fall under PD (e.g. it’s over a certain size, close to a boundary, or in a conservation area), you’ll need to apply for planning permission.
Check your local authority website for guidance—or ask us to manage this part for you.
Step 5: Choose the Right Team
This is where many projects succeed—or fail.
Avoid going straight to general builders without checking experience, references, and qualifications. Look for home extension builders near me with:
Proven structural and groundworks experience
Familiarity with local planning regulations
Clean communication and clear quotations
An understanding of timelines, access, and neighbour considerations
Safe‑Bricks Limited specialises in rear home extensions and structural builds throughout Brighton & Hove. We work in small, expert-led teams, offering clear advice, full transparency, and professional support every step of the way.
Step 6: Don’t Forget the Details
The best home extension plans include:
Heating and electrical layouts
Lighting ideas
Drainage updates
Interior finish specs
Temporary access and safety measures during the build
The more detailed your plan, the smoother the build. We help you break everything down so there’s no ambiguity when it comes time to build.
Final Thought: Planning = Peace of Mind
The success of your home extension doesn’t start on site—it starts with the plan.
A detailed, realistic, and professionally informed home extension plan will:
Prevent delays and cost overruns
Make it easier to get planning approval
Keep your builder accountable
Maximise your finished space and value
Whether you're exploring options or ready to get started, investing in a proper plan is always worth it.
Let’s Build It Right from the Start
Safe‑Bricks Limited offers site assessments, structural consultations, and full planning support for rear home extensions and major structural work.
If you’re searching for home extension builders near me, we’d love to help you turn your ideas into a safe, beautiful, and well-executed build.
