House Extensions
Create more living space with seamless, high-quality house extensions — single or double-storey, side, rear, wraparound or kitchen extensions across London.
Extend your home, upgrade your lifestyle
Whether it’s an open-plan kitchen, a new bedroom, or extra family space, NMSM delivers extensions that integrate seamlessly with your home.
Tailored Design
We work with your architect or provide design support for the perfect layout.
Seamless Integration
Brickwork, roofing and finishes matched to your existing home.
Clear Management
Weekly progress reports and transparent variation logging.
On-Time Delivery
Realistic timelines and strong site management to keep works on track.
Types of house extensions
Rear Extension
Extend outwards into the garden — popular for open-plan kitchen diners.
Side Extension
Make use of unused alleyways or narrow side plots for practical extra space.
Wraparound
Combine rear + side extension for maximum ground floor transformation.
Double Storey
Add bedrooms and bathrooms upstairs while extending living space below.
What’s included
- Surveys, groundworks, foundations, drainage connections
- Structural works: RSJs, steel frames, brick/block/stonework
- Roofing, skylights, bifold/sliding doors, windows
- First/second fix electrics, plumbing, heating & ventilation
- Insulation, plastering, flooring, carpentry & joinery
- Kitchens, bathrooms, bespoke storage, feature finishes
- Exterior landscaping, patios, drainage adjustments
- Certificates, warranties, Building Control approvals
How an extension project runs
Consultation & Quote
We review your space, drawings, and provide a transparent quote.
Planning & Approvals
Planning permission, party wall agreements, and Building Regs handled.
Build Phase
Groundworks, structure, roof, glazing, MEP and finishes.
Handover
Snag-free completion with warranties, certificates, and aftercare.
Typical extensions: 8–12 weeks (single storey) · 12–16+ weeks (double storey).
Recent Extension Projects
A snapshot of our house extension work across Greater London.
House Extension – FAQs
Do I need planning permission for an extension?
Many single-storey rear or side extensions fall under permitted development, but larger/double-storey ones may need planning. We’ll advise and apply if required.
How long does an extension take?
Timelines vary, but typically 8–12 weeks for single-storey and 12–16+ weeks for double-storey. We provide a programme before works start.
Can you match my existing finishes?
Yes. We carefully source matching bricks, roof tiles and finishes so the extension blends seamlessly with your home.
What about party wall agreements?
If works affect a shared wall, we’ll guide you through the Party Wall Act process and coordinate with surveyors if needed.
Ready to extend your home?
Tell us about your plans — we’ll provide a clear, no-obligation quote.