Free consultation & quote
We visit, talk through your ideas and send a clear, fixed written quote — no obligation.
Crawley & West Sussex · 20+ Years
Home Extension Specialists in Crawley
With over 20 years’ experience and 250+ 5-star reviews, Shield Build offers a personal, bespoke extension service across Crawley & West Sussex — managing every stage from concept to completion, including planning, Building Regs and structural calculations.
Fully insured
Free no-obligation quotes
Building Regs handled
What’s included
- Full bespoke design & planning service
- Planning permission & Building Regs handled
- Structural calculations taken care of
- Gas & electrical by certified professionals
- High-quality materials & workmanship guarantee
20+
Years’ experience
250+
5-star reviews
100%
Fully insured
Free
Fixed written quotes
End–to–end
Project managed
Our extension services
Your extension journey, start to finish
We manage every stage of the project — from the first design through to the final finishing touches — tailored to your home and your vision.
Single-Storey Extensions
Create more space with our custom-designed single-storey extensions — perfect for kitchens, living areas and more.
Most popular
Two-Storey Extensions
Add bedrooms, bathrooms and living space across two floors, designed to blend seamlessly with your home.
Maximise space
Kitchen & Living Extensions
Bright, open-plan kitchen-diners and living spaces with bi-fold doors and roof lights.
Free design
Garage Conversions
Turn an underused garage into a room, home office or annexe that works for your family.
Quick win
Design & Planning
Our comprehensive design and planning service ensures your extension meets your needs and complies with regulations.
Regs handled
Project Management
Our project management service ensures your build runs as smoothly as possible from start to finish.
End to end
Why extend?
Why build an extension on your home?
A space that works for you
Whether it’s a new kitchen, a home office or a playroom, an extension offers versatile options to suit your lifestyle.
Add value to your home
An extension can add roughly 5–10% to your property’s value — a strong return on your investment.
Stay in the home you love
Create the extra space you need while avoiding the upheaval of moving — more room without leaving your beloved home.
Why Shield Build
Extensions done right the first time
In our 20+ years specialising in house extensions, we’ve often been called in to fix projects gone wrong by general builders who cut corners. A poorly executed extension leads to costly mistakes and stress — so we build flawless, bespoke extensions that add real value to your home.
Fully qualified team
Planning permission, Building Regs and structural calculations all handled in-house.
Safe & fully functional
All gas and electrical work carried out by trusted, fully certified professionals.
Built to last
Only high-quality materials, for a finish built to stand the test of time.
On time, on budget
Delivered to the highest standard of workmanship — when we said, for what we quoted.
How it works
From inspection to full compliance
From inspection and compliance reports through to repairs and full installation — everything you need to keep your property safe and compliant.
Design, planning & regs
We handle the drawings, any planning application, Building Regs and structural calculations for you.
The build
Our team builds your extension to a high standard, kept tidy and on schedule throughout.
Sign-off & guarantee
Final walk-round, completion certificates and your written workmanship guarantee.
Genuine reviews
Don't take our word for it
★★★★★
Very professional service. Arrived on time and did a great job on our fire door and left the place like he was never there. Have already recommended him to my neighbours.
Neil Hazell
House Owner
Common questions
Frequently asked questions
Andrew
Founder, Shield Build
Not sure what your property needs? Get in touch and I’ll give you honest advice on staying compliant — no sales pressure.
Call us directly
Reply within one working day
How much does an extension cost?
The cost varies depending on size, specifications and materials. We provide detailed quotes after understanding your specific requirements — get in touch for a personalised estimate, and once you’re happy we set out a schedule of stage payments in writing.
Do I need planning permission for an extension?
Many extensions fall under permitted development, but it depends on the size and your property. We assess this for you and handle any planning application that’s needed — you won’t have to deal with the council yourself.
How long does it take to build an extension?
Most single-storey extensions take around 8–12 weeks on site once approvals are in place. We give you a realistic timeline with your quote and keep you updated throughout.
Can I live in my home while an extension is being built?
In most cases, yes. We seal off the works from the rest of your home wherever possible and keep the site tidy, talking you through what to expect at each stage.