House Extensions
House Extensions in Hertfordshire, Bedfordshire & Cambridgeshire
Need more space but love where you live? LJT Construction has been designing and building house extensions across Hitchin, Bedford, Cambridge and the surrounding areas for almost 20 years — giving growing families room to breathe without the upheaval of moving house.
Introduction
A well-planned extension can transform how a home works — more space for family life, a better connection to the garden, or simply a layout that finally makes sense. We manage every stage of your extension ourselves, from design and planning through to the final finish, so you deal with one trusted builder rather than a string of subcontractors.
Types of Extension We Build
Single-Storey Extensions
The most popular way to extend a kitchen, dining area, or living space out into the garden. Often achievable under permitted development rights, single-storey extensions are usually quicker to build and a cost-effective way to add significant everyday living space.
Double-Storey Extensions
Ideal when you need more space both upstairs and down — an extra bedroom or bathroom above a larger kitchen or living area, for example. Building both storeys at once is typically more cost-effective per square metre than two separate projects.
Side Return Extensions
Common on terraced and semi-detached homes, a side return extension fills in the unused side alley to widen the kitchen or living space, often paired with a rear extension to open the whole ground floor up.
Wrap-Around Extensions
Combining a side return and rear extension into one continuous space, a wrap-around delivers the biggest transformation of ground-floor living space and is a favourite for open-plan kitchen-diners.
Why Choose LJT Construction
- Almost 20 years of experience building extensions across Hertfordshire, Bedfordshire and Cambridgeshire
- One point of contact from design through to completion — no chasing multiple trades
- Structural work carried out to full Building Regulations standard, including steels, foundations and drainage
- Clear, honest quotes with no hidden extras
- Careful, tidy site work — we treat your home and garden with respect while we're there
- Friendly advice from the first phone call, whether or not you go ahead
Our Process
- Free consultation and survey — we visit your property, discuss what you want from the extra space, and advise on the right approach for your home and budget.
- Design and planning — we produce drawings and handle Building Regulations applications, and planning permission where needed.
- Groundworks and structure — foundations, steels, brickwork and the roof, all signed off to regulation.
- First and second fix — insulation, plastering, electrics, plumbing, windows and doors.
- Finishing touches — decoration, flooring and a final walkthrough so you're completely happy before we leave.
Do You Need Planning Permission?
Many single-storey extensions fall under permitted development rights and don’t need full planning permission, though there are limits on size and position that vary by property. Double-storey and larger extensions more often require an application. Building Regulations approval is always required regardless of size or type. We’ll assess your property at the free survey stage and tell you exactly what’s needed for your project, and handle any applications on your behalf.
FREQUENTLY ASKED QUESTIONS
How long does a house extension take?
A single-storey extension typically takes 8 to 12 weeks, while a double-storey extension can take 12 to 16 weeks, depending on size and complexity. We’ll give you a clear timeline before work begins.
Will I need to move out during the work?
Most clients stay in their homes throughout, particularly for single-storey rear or side extensions. For larger or more disruptive projects we’ll talk you through what to expect at the survey stage.
How much does a house extension cost?
Cost depends on the size, type, and specification of the extension. We provide a detailed, no-obligation quote after a free site survey, so you know exactly what you’re paying for before committing.
Will an extension add value to my home?
Yes — a well-designed extension is one of the most reliable ways to add both usable space and resale value, particularly when it improves the flow between kitchen, dining and garden.
Ready to give your home more room to live in?
Get in touch today for a free, no-obligation extension quote and friendly advice from a builder who’s seen it all.