SEMI-DETACHED HOUSE EXTENSION LONDON

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H1: Semi-Detached House Extension London – Rear, Side & Wrap-Around Extensions | LASTING LTD

A semi-detached house extension is one of the best ways to expand ground-floor living space, increase natural light and add significant property value.
LASTING LTD builds high-quality extensions for semi-detached homes across London — including rear extensions, side extensions, double-storey and wrap-around configurations.

Structural RSJ included • Fast construction • Premium finishing • Free site visit

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Why Semi-Detached Extensions Are Ideal for London Homes

Semi-detached homes offer major design flexibility:

Large open-plan kitchen/living layouts

Perfect for bifold or sliding door openings

Plenty of sunlight from side + rear

More structural options vs terraced houses

Excellent ROI (+15–25% property value)

Suitable for:

• Open-plan kitchen diners

• Family living areas

• Utility rooms / office space

• Larger rear lounges

• Additional bathrooms

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Why Choose LASTING LTD

• 10+ years experience with semi-detached extensions

• Structural steel RSJ beams included

• Architectural drawings & engineering support

• Building Control + planning assistance

• Full project management

• Clean, fast, reliable workmanship

• Premium finishing & attention to detail

• Transparent fixed pricing

CTA: Get a Free Semi-Detached Extension Quote

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Types of Semi-Detached Extensions We Build

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1. Rear Extension (Most Popular)

Ideal for:

• Large kitchen diner

• Open-plan living room

• Modern glazing & skylights

Benefits:

• Fastest approval

• Strongest resale value

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2. Side Extension / Side Return Extension

Perfect for:

• Widening a narrow kitchen

• Extending utility rooms

• Creating additional floor area

Side spaces in semi-detached houses are often underused → ideal for extension.

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3. Wrap-Around Extension

The premium option combining rear + side, giving massive open-plan space.

Best for:

• Luxury kitchen diner

• Large folding/sliding doors

• Complete ground-floor reconfiguration

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4. Double-Storey Semi-Detached Extension

Adds:

• New bedroom(s)

• En-suite

• Extended ground floor

Most cost-effective per m² of new space.

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What’s Included in the Build

Structural

• RSJ steel beams

• Load-bearing wall removal

• New foundations

• Drainage works

• Brick/blockwork

• Roof (flat/pitched)

External

• Bifold/sliding doors

• Skylights / roof lanterns

• Insulation to Building Regs

• Rendering, brick slips or cladding

Internal

• Plumbing & heating

• Electrical installation

• Underfloor heating (optional)

• Plastering & painting

• Flooring: tiles, wood, LVT

• Kitchen fitting (optional)

Management

• Dedicated project manager

• Weekly progress updates

• Building Control compliance

• Snagging + final certification

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Semi-Detached House Extension Cost (London 2025)

All prices include:
Labour
Materials
Structural steel
Project management
Finishing

CTA: Request a Personalised Quote

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Timeline

• Design & planning: 2–6 weeks

• Structural & groundworks: 3–6 weeks

• Roofing & glazing: 1–2 weeks

• Interiors & finishing: 3–6 weeks

Average total: 10–14 weeks

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Benefits of Working With LASTING LTD

• Guaranteed premium finish

• Fast start dates in North & East London

• Experienced structural team

• Excellent communication

• Absolutely no hidden costs

• We handle everything from drawings to completion

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Areas We Cover

• Enfield

• Barnet

• Haringey

• Edmonton

• Palmers Green

• Walthamstow

• Muswell Hill

• Finchley

• Tottenham

• North London

• East London

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Related Services:

• House Extension London

• Single Storey Extension

• Timber Frame Extension

• Loft Conversion London

• Structural RSJ Installation

Related Areas:

• Builder in North London

• Builder in Enfield

• Builder in Barnet

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Start Your Semi-Detached House Extension Today

Transform your ground floor into a bright, modern open-plan space.
Fast, reliable and fully managed by LASTING LTD.

CTA:

• Get a Free Quote

• WhatsApp Us (Fast Response)

• Book a Site Visit