House Extensions

A rear extension involves extending the back of your property into the garden to create a larger living area, kitchen-diner, or open-plan space. This is one of the most common and cost-effective ways to extend a home in London.

Ideal for:

• Open-plan kitchen/diners
• Extended living rooms
• Family or entertainment areas

Average house extension cost in London:
£1,900 – £2,400+ per m²
(Turnkey build, excluding kitchen fittings and finishes)

A side return extension fills in the often-unused alley space to the side of a property, especially common in Victorian and Edwardian terraced houses. It’s a smart way to add space without sacrificing too much of the garden.

Ideal for:

• Kitchen expansions
• Dining areas
• Improving flow and light in narrow homes

Average house extension cost in London:
£2,000 – £2,600+ per m²

Combining a rear and side return extension, a wraparound extension offers the most space and design flexibility. It’s ideal for creating large, open-plan layouts with stunning indoor-outdoor connections.

Ideal for:

• Large open-plan kitchen/living/dining spaces
• Homes needing maximum ground floor expansion
• Contemporary layouts with bi-fold doors or skylights

Average house extension cost in London:
£2,200 – £2,800+ per m²

A two-storey extension adds additional space on both the ground and first floors. It’s a great investment for families who need more bedrooms, bathrooms, or workspace without moving house.

Ideal for:

• Adding a master suite, en-suite bathrooms, or extra bedrooms
• Creating open-plan space downstairs and bedrooms upstairs

Average house extension cost in London:
£2,400 – £3,000+ per m²
(Note: cost-effective per m² due to shared foundations and roofing)

A dedicated kitchen extension can transform the heart of your home — perfect for modern kitchen-diners, family zones, and entertaining spaces.

Ideal for:

• Open-plan layouts
• Kitchen islands and dining zones
• Bright spaces with skylights or garden access

Average house extension cost in London:
£1,900 – £2,500+ per m²
(Depending on design complexity and finishes)

While not a ground-floor extension, many of our clients combine house extensions with a loft conversion to fully maximise their space.

Ideal for:

• Additional bedroom with en-suite
• Home office or guest room
• Adding value in space-restricted homes

Average house extension cost in London:
£45,000 – £75,000+
(for dormer lofts with en-suite)