House Extensions in Essex & Suffolk
Single-storey, double-storey and loft extensions, managed end to end.
Get Your Bespoke QuoteExtension Builders Across Essex & Suffolk
Judson Developments build house extensions throughout Essex and Suffolk — single-storey and double-storey extensions, kitchen extensions, loft conversions and rear extensions. We guide you through planning permission and permitted development, then manage the build from foundations to final finish, so your extension adds genuine space and value without the usual stress.
Our Services
We design and build extensions that add space, light, and value — tailored to suit your home and lifestyle.
Single-Storey Extensions
Create more living space with seamless ground-level extensions designed to blend with your home.
Double-Storey Extensions
Add both space and value with carefully planned multi-level extensions.
Kitchen Extensions
Expand your kitchen into a modern, functional hub for cooking, dining, and entertaining.
Open-Plan Living Spaces
Transform your home with open-plan layouts that maximise light, flow, and flexibility.
Garden Rooms & Orangeries
Bring the outdoors in with stylish garden rooms or orangeries tailored to your needs.
Bespoke Design Solutions
Custom-designed extensions built around your vision, with finishes that complement your home.
Get Planning Advice.
House Extension FAQs
Do I need planning permission for an extension?
Many single-storey rear extensions fall under permitted development, but the limits on depth, height and garden coverage are specific — and differ for terraced, semi-detached and detached homes. Our guide to permitted development in Essex covers the detail.
How much does an extension cost?
Single-storey extensions typically run £1,800–£3,000 per square metre nationally, with Essex and the South East sitting higher. Our 2026 extension cost guide works through real examples by size.
How long does an extension take?
A straightforward single-storey extension is usually 10–16 weeks on site. Design, planning and building regulations approval beforehand can add two to four months if permission is required.
Do you handle planning and building regulations?
Yes. We guide you through what’s needed, coordinate with architects and structural engineers, and manage building control sign-off so it isn’t left to you.
Can we stay in the house during the build?
In most cases yes, particularly for rear extensions where the existing house stays sealed until the final connection. We’ll be upfront about the disruptive stages so you can plan around them.
Is a double-storey extension twice the price?
No — the foundations, drainage and roof are already being paid for, so adding a second storey typically adds around 50–60% rather than 100%. It’s often better value per square metre.
What types of extension do you build?
Single-storey, double-storey, roof and loft extensions — see our guides to single storey, single vs double storey, roof and loft extensions for the detail on each.
Do you provide the drawings, or do I need an architect?
Often we can handle straightforward drawings ourselves, or bring in the right professional as part of the project. Our guide to extension architects explains when a full architect is worth it and when it isn’t.
Why Work With Us?
At Judson Developments, we combine Gas Safe certification with over 13 years of experience to deliver work you can trust. Every project is tailored to your home, and with a 5★ customer rating, our reputation speaks for itself.
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What Our Clients Say
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