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House Extensions in London
If you're thinking about extending, you're probably juggling the same questions most London homeowners face:
- Will it go over budget?
- How disruptive will it be day-to-day (especially the kitchen)?
- Do we need planning permission and how long will it take?
- How do we choose a builder we can actually trust?
Before we get into extension types and costs, here’s a quick, practical guide to making the build run smoothly at home.
Mini guide: living through an extension (without losing your mind)
We work with homeowners who care about getting the extra space right, and having a builder they can rely on. We focus on clear communication, detailed quotes, and hands-on site management.
Our house extension process
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First visit: brief + feasibility + next steps
Quote + programme (clear and comparable)
Design & specification (make it buildable)
On site, we talk through what you want to achieve and what matters most (space, layout, finish, budget). We’ll also assess the practical side — access, structure, neighbours, and any likely constraints — then outline the best route forward.
You’ll receive a detailed quote and a realistic timeline, with clarity on what’s included, what’s excluded/allowances, and how variations are handled.
Work with your architect/designer, or we can help shape the brief. We make sure the design is practical, the key details are defined, and the specification matches your budget — so you’re not making expensive decisions mid-build.
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Planning / Party Wall / Building Regs support
Build phase (managed day-to-day)
Snagging + handover
We’ll guide you through what’s required and help you avoid common delays — especially where neighbours, conservation areas, or approvals are involved.
Site setup and protection, trade scheduling, quality checks, and regular updates — so you always know what’s happening next and what decisions (if any) are coming up.
Final checks, snagging, sign-off, and a clean handover so you can start using the space properly.
Types of London House Extensions
Rear Extension
Best for: Bigger kitchen-diner, open-plan family space, better garden connection. Transform how you live day-to-day with a seamless indoor-outdoor flow.
Typical outcomes: Larger kitchen, dining zone, family seating area, improved light.
Side Return Extension
Best for: Victorian/Edwardian terraces with a narrow side alley. A smart way to widen the ground floor without sacrificing significant garden space.
Typical outcomes: Wider kitchen, better storage, space for an island, improved circulation.
Wraparound Extension
Best for: Maximum ground-floor transformation. By combining rear and side extensions, you unlock a major lifestyle upgrade and massive floor plans.
Typical outcomes: Big open-plan kitchen-diner, utility, downstairs WC, strong garden connection.
Double-Storey Extension
Best for: Adding both ground-floor living space and upstairs bedrooms/bathrooms. The ultimate solution for a long-term family home layout.
Typical outcomes: Larger kitchen/living downstairs plus new master suite or bedrooms upstairs.
London Extension Cost Guide
Extension costs in London vary based on structural complexity, access, and specification. Below is a guide to typical ranges for clear budgeting.
Estimated Cost Ranges
Calculated for North & East London standard builds.
- Rear extension: £30k–£80k
- Side extension: £35k–£90k
- Wraparound: £50k–£120k
- Double-storey: £80k–£180k+
Key Cost Drivers
Factors that influence your final investment:
- Structural steelwork & load-bearing removal
- Foundations & groundworks complexity
- High-spec glazing (Bifold/Sliding doors)
- Kitchen & bathroom finish level
What's Included in Your Quote
Clear, comparable quotes so you know exactly what you're paying for:
- Full Project Management & Scheduling
- Site Setup, Protection & Welfare
- Structural Work & Build Execution
- Demolition & Waste Removal
- Final Snagging & Project Handover
Items Usually Clarified Separately
Items typically treated as allowances or personal selections:
- Kitchen Units & Specialist Appliances
- Bespoke Joinery & Fit-out
- Designer Lighting Fittings
- External Landscaping Beyond Build Site
We'll talk you through every detail clearly before you commit.