LACD builds house extensions across London as main contractor. Most extensions here are added to existing period houses, which means taking down and re-supporting walls, working to a party wall award, connecting to old drainage and matching or deliberately contrasting with the original building. Our founder’s structural engineering background means these questions are answered before work starts, not discovered on site.

Types of extension we build

The illustrations below show the main types of extension. They are visualisations for guidance, not photographs of LACD projects.

Single-storey rear extension

Illustration of a single-storey rear extension to a Victorian house

Extends the ground floor into the garden, usually for a larger kitchen, dining or family space with wide glazing to the garden.

Side-return extension

Illustration of a side-return extension to a Victorian terrace

Infills the narrow strip beside the back addition of a Victorian or Edwardian terrace, turning a galley kitchen into a full-width room.

Wrap-around extension

Illustration of a wrap-around extension to a London house

Combines a rear and side-return extension around the back addition, which gives the biggest change to a ground-floor layout.

Double-storey extension

Illustration of a double-storey rear extension to a Victorian terrace

Adds space on two floors, typically a larger ground floor below and a bedroom or bathroom above. Planning is more sensitive because of the effect on neighbours.

Glazed kitchen extension

Illustration of a glazed kitchen extension to a Victorian terrace

A rear extension with a largely glazed roof and wide doors, bringing daylight deep into a kitchen and dining space.

Glass box extension

Illustration of a glass box extension to a Victorian townhouse

A single-storey extension with frameless or minimally framed glazing, often used where the design should contrast with a period house.

Orangery

Illustration of an orangery extension to a Victorian townhouse

A single-storey garden room with a central roof lantern and a solid perimeter roof, giving daylight without the heat gain of a fully glazed roof.

What we manage on every extension

Structure: steel beams, padstones and foundations designed for the existing building, with temporary propping while walls are opened up.
Party walls: notices and awards in place before steel bears on a shared wall or foundations are dug near the neighbours.
Approvals: planning or permitted development, Building Control inspections and completion certificates.
Drainage: surveys of existing runs, and build-over agreements where public sewers are affected.
Envelope: glazing, rooflights, roofs and brickwork detailed for weather-tightness and thermal performance.
Services and finishes: underfloor heating, electrics, kitchens and bespoke joinery, coordinated with the structure from the start.

Cost and programme

Typical construction rates in London, before fees and VAT:

Extension	£ per m²	Programme
Single-storey rear	£3,360 – £6,600	10–20 weeks
Side-return	£2,880 – £6,000	12–22 weeks
Wrap-around	£3,600 – £6,240	16–28 weeks
Double-storey	£3,000 – £6,600	18–32 weeks

For a full budget including professional fees, party wall, Building Control, contingency and VAT, use the project cost calculator.

Recent extension projects

Shepherdess Walkgarden extension to a Grade II-listed townhouse, on screw piles with a Douglas fir frame
Falkland Roadrear extension in Vande Moortel brick with Accoya beams, plus refurbishment of the flat
Muswell Hillwrap-around extension, loft conversion and full refurbishment
Two-storey extension, Hackneytwo-storey glazed rear extension with a tiled facade and a full refurbishment

What clients say

We recently worked with Yasin Yuksel on a major renovation project, including a loft conversion, a full two-storey house renovation, a new kitchen and bathroom, and a 25-square-metre extension. From start to finish, he was absolutely excellent. He was extremely reliable, transparent, and professional throughout the entire process. Communication was always easy and clear. He was kind, responsive, and always willing to explain things in detail. Even though the project ended up being slightly delayed by a couple of weeks, this was only due to additional work we requested along the way.

Mr C. Gul, Retrofit Designer

LACD worked to a high standard and with diligence. We are happy with the outcome, and hope to work with them again in the future.

Martin, Architect, RIBA

Yasin from LACD was an excellent find. He is both a great communicator and an expert in his field. He assisted with design decisions as well as catering for problems that came up along the way without hesitation.

Molly, Interior Designer

Yasin is not just very knowledgeable but is also a very responsible team member who communicated very well with us, the client, suppliers and all the others involved with the projects.

Studio Anares

Yasin and his team were motivated to produce a finished construction which would be practical and comfortable for my family and me in our daily lives, paying good attention to details and always bringing in common sense.

London townhouse owner