Home Extensions

Home Extensions

Discover

Extend
Convert,
Create.

Home extensions are the perfect way to increase the size
and value of your London property. We can help you add
much needed space to your home, with single or multi-
storey extensions, rear extensions, side extensions or
even loft conversions.

Our experts are here to ensure that the cost of extension
will suit budgets of all sizes.

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EXTENSIONS & CONVERSIONS


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Loft conversion

Reclaim your roof. Loft conversions can be the most cost effective way of adding real value to your property. See below or click here for loft conversion costs.

See case study
3D render of kitchen for article on single storey extension in Merton

Side Extension

A side extension allows you to transform unused outdoor space into valuable indoor space. Extend your kitchen, living room, or even add additional bedrooms and bathrooms.

See case study
standard extension image on blog on Architect Fees for Extension Work

Rear Extension

A patio, terrace or garden might not be the most effective use of the space available to you. With a rear house extension you can greatly increase your home’s floorspace.

See case study
contemporary extension image on blog on Architect Fees for Extension Work

Single Storey Extension

Create extraordinary new rooms and views with the addition of a single storey extension. Click here to see our cost of a single storey extension guide.

See case study
artist's impression of finished development on portfolio for New Developments North London

Multi-Storey extension

Transform your property by adding multiples of the current floorplan. The sky’s the limit with the potential uplift in value that a multi-storey extension can provide.

See case study

WHAT DOES AN EXTENSION COST?

Our cost of extension estimates provide you with a rough guide to get you started.

COST OF EXTENSION

What’s the cost of an extension? Extensive experience shows costs range from £1000-1800/sqm.

Site survey: from £350
Planning: from £850
Construction from £50K
costs: @£1000-1800m²

COST OF SIDE
& REAR EXTENSION

The cost of side and rear extensions usually average around £1700/sqm.

Site survey: from £400
Planning: from £1100
Construction from £70K
costs: @£1000-1800m²

LOFT CONVERSION COST

Loft conversion costs vary greatly, but usually average £1000/sqm.

Site survey: from £400
Planning: from £950
Construction from £40K
costs @£1000-1800m²

COST OF SINGLE STORY EXTENSION

The cost of a single storey extension will in most cases averages £1100/sqm

Site survey: from £400
Planning: from £1200
Construction from £65k
costs: @£1000-1800m²

COST OF MULTI-STORY EXTENSION

Multi-storey extensions require more structural work therefore cost on average £1800/sqm.

Site survey: from £500
Planning: from tba
Construction from £75k
costs: @£1000-1800m²
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Our Process

  • Site survey followed by project planning.
  • Extension cost analysis, extension costing and project approval.
  • Design the home extension and submit planning application.
  • Start the build - or let us manage it for you.
Learn more

Why Extension Architecture? We are...

Reliable
Excellent value
London’s leading architect

Get in touch to plan your dream home extension

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