House Extensions
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Architectural Design, Planning Permission & Building Regulations for Home Extensions
A house extension is one of the most effective ways to add space, increase property value, and improve how your home works for modern living.
At Planning Build, we help homeowners design and deliver beautiful, practical and planning-compliant home extensions. Our team provides a complete service including architectural design, planning permission, building regulations drawings and structural engineering.
Whether you want a rear extension, side extension, wraparound extension or double-storey extension, we guide you from the first concept through to construction.
Why Build A House Extension?
Moving home is expensive and stressful. Extending your property allows you to unlock the potential of your existing home without relocating.
A well-designed extension can:
Create open-plan kitchen and living spaces
Add extra bedrooms or bathrooms
Improve natural light and layout
Increase property value
Make your home more functional for growing families
Many homeowners in the UK choose extensions because they are often more cost-effective than moving house.
Types of House Extensions We Design?
Planning Build provides architectural design and technical drawings for all major types of house extensions.
Rear Extensions
Rear extensions are the most common type of extension in the UK. They are ideal for expanding kitchens, dining areas or living spaces.
Side Extensions
Side extensions utilise unused space along the side of your property and can significantly increase internal floor area.
Wraparound Extensions
A wraparound extension combines a rear and side extension, creating large open-plan living areas.
Double Storey Extensions
Double storey extensions add space across two floors, making them ideal for adding bedrooms and bathrooms upstairs while expanding living areas below.
Kitchen Extensions
Kitchen extensions create larger cooking and dining areas, often with bi-fold doors and garden views.
Single Storey Extensions
Single storey extensions are one of the most popular options for homeowners wanting to expand ground floor living space.
Do You Need Planning Permission For An Extension?
Some house extensions fall under Permitted Development Rights, meaning planning permission may not be required.
However, many extensions still require full planning permission, particularly if:
The extension is large
The property is in a conservation area
The property is a flat or maisonette
The design exceeds permitted development limits
At Planning Build, we assess your project and advise whether your extension can proceed under Permitted Development or requires planning permission.
We also prepare and submit the full planning application on your behalf.
Projects We Support
Our Planning & Build Process
We believe successful projects start with clarity. That’s why we follow a structured, transparent process from initial feasibility to final delivery.
Step 1: Planning Appraisal & Feasibility
At this stage, we assess:
Whether your proposed development is feasible
Whether planning permission is required
What type of application (if any) is needed
Estimated planning and consultant costs
Key planning risks and constraints
The overall likelihood of success
This early-stage assessment reduces uncertainty, minimises risk and ensures you make informed decisions before committing further time or investment.
Step 2: Design & Technical Preparation
If your project is viable, our team will guide you through the next stages.
We provide a fully integrated service including:
Architectural design
Planning permission applications
Building regulations drawings
Structural engineering coordination
Technical detailing
Our approach ensures that design, compliance and buildability are aligned from the outset, preventing delays later in the process.
Step 3: Application Submission & Management
Once your design is finalised, we prepare and submit all required documentation.
We:
Compile and submit your planning application
Liaise with the local authority
Respond to case officer queries
Manage amendments if required
Provide regular progress updates
You won’t need to chase the council; we handle everything on your behalf.
Step 4: Post-Approval & Construction Support
After securing planning approval, we continue supporting your project through:
Building regulations approval
Structural engineering integration
Construction coordination
Our goal is to provide a seamless transition from concept to completion.
Step 5: Ongoing Support & Communication
If you choose to instruct us, our experts manage the entire process for you.
You receive:
Clear timelines
Transparent advice
Regular updates
Direct communication with your dedicated consultant
We make the process straightforward, structured and stress-free.
What We Do
Planning Build offers a full suite of services tailored to every stage of your planning and construction journey:
Planning
Services
We assist with planning permission, applications, and appeals, guiding you through UK planning requirements from start to decision.
Design
Services
We provide architectural and structural design services, delivering compliant, practical, and build-ready solutions.
Build
Services
Our construction and engineering services turn approved plans into completed projects, delivered safely and efficiently.
Frequently Asked Questions
How much does planning permission cost?
Planning application fees vary depending on development type and scale. Local authority fees are set nationally, but consultancy fees depend on complexity.
Can I start building without planning permission?
No. Starting works without required approval can lead to enforcement action.
What happens if planning permission is refused?
You may revise and resubmit or appeal through the Planning Inspectorate within statutory time limits.
With a dedicated team of experienced planning professionals, we provide a truly personal, end-to-end service. Because of our size, our consultants remain hands-on throughout your matter from start to finish. That means clear accountability, direct communication, and someone who is always available when you need guidance. We believe in transparency at every stage, offering honest advice and discussing fees openly from the outset.
The feedback from our clients reflects the level of care, skill and commitment we bring to every case:
“So far my experience has been great; the planning team and admin team are always responsive and helpful. My application for planning has been logged with ease.” – E. Leyland
We Can Assist You
Please call 02035811233, complete our enquiry form, or email our planning law UK expert.
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What Our Clients Say
The consultants explained possibilities under the caravan act. It’s a refreshing system. The consultant provided a consturctive answer.
Rosie Murray
Secure Your Property. Start Your Project. Stay Compliant
Speak with our expert team today and take the next step toward approval and completion.