Open-plan kitchen extension with rooflight, large glazing and oak flooring

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House Extensions in London & the Home Counties

Rear and side extensions that add light and space: open-plan kitchen-diners, rooflights, large glazing and seamless links to the garden.

Free quote Call 07774 600 922

Extensions in London

House Extensions by Alex Deco Design

An extension is one of the best ways to add space and value without moving. Alex Deco Design builds rear and side extensions across London and the Home Counties, including Watford, St Albans, Harpenden, Amersham and Beaconsfield, and takes care of the build from groundwork to finishing.

Many of our extensions create open-plan kitchen, dining and living areas with rooflights, bifold or sliding glazed doors and large-format floor tiles or oak flooring, so the new space opens onto the garden and fills with daylight.

What’s included

Groundworks, foundations and brickwork
Structural openings and steelwork into the existing house
Roof structure, rooflights and glazing
Bifold or sliding doors and windows
Electrics, plumbing and underfloor heating
Plastering, flooring and decoration
Kitchen and fitted furniture installation

Our work

Extensions gallery

A selection of recent projects. Tap any photo to enlarge.

Dark fitted kitchen with a rooflight and large-format tiled floor in a rear extension

Grey shaker kitchen with large island, brass pendant lights and bar stools

Open-plan kitchen and dining space with rooflight, bifold doors and large floor tiles

Grey shaker kitchen with crittall-style doors to the garden and oak flooring

Dark kitchen with rooflight and glazed doors opening to the garden

Open-plan kitchen with marble island, curved banquette seating and glass pendant lights

Open-plan kitchen, dining and living area with island, rooflight and large-format floor tiles

Kitchen with marble waterfall island, oak-effect tall units and glazed doors to the garden

Open-plan living and dining room with bifold doors, rooflight and bespoke fitted TV unit

Rear extension in yellow London brick with crittall-style glazing and a loft dormer above

Refurbished room with oak flooring and sliding glazed doors to the garden

Rendered rear extension with bifold doors and large-format porcelain terrace

Dark kitchen with rooflight, integrated ovens and light floor tiles

Rendered extension with grey-framed door, window and porcelain patio with step lights

Kitchen extension with cream shaker cabinets, blue island and oak flooring

Porcelain terrace with illuminated steps beside a modern rendered extension

Extension interior with exposed brick wall, crittall-style doors and stone floor tiles

Open-plan kitchen, living and dining area with large rooflight

Brick rear extension with sliding glass doors, glazed corner window seat and sandstone patio

Rear extension seen from the garden with sliding glass doors and a sandstone terrace

Why Alex Deco Design

A contractor you can rely on

Full build service

From groundworks through to the finished interior.

Light-filled design

Rooflights and glazing planned to bring daylight deep into the room.

Free site visit

We discuss your plans and give a written quotation.

See what customers say on Google

Read our Google reviews

Areas we cover

Extensions across London & the Home Counties

We carry out extensions in Watford, St Albans, Harpenden, Amersham, Beaconsfield and across north, north-west, west, south-west and central London. See all areas we cover.

Watford Harpenden Beaconsfield Amersham St Albans North London North West London West London South West London Central London

Questions

Do I need planning permission for an extension?

It depends on the property and the size of the extension. Many projects fall under permitted development, others need planning. Your local council or an architect can confirm, and we can talk it through at the site visit.

Can you work from our architect's drawings?

Yes. We can build to your existing drawings and structural details, or discuss how to take the project forward.

Do you cover my area?

We cover London and the Home Counties, including Watford, St Albans, Harpenden, Amersham and Beaconsfield.

Is the quotation free?

Yes. Call 07774 600 922 or send a message and we will arrange a visit.

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