Design and build · Surrey
House extensions in Epsom, designed and built by one team from our base in New Haw, about 10 miles away.
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10 to 14 weeks
to build a single-storey rear extension
Borough Council decides planning
Conservation areas
Epsom Town Centre, Church Street, Stamford Green and others
10 miles
from our base in New Haw
Building in Epsom
Epsom's houses give extensions different starting points: older houses on the roads built up after 1869, inter-war estates such as Copse Edge Avenue, Langley Vale's 20th-century homes and the newer Horton homes. Allow 16 to 24 weeks on site for a double-storey or wrap-around extension, and 10 to 14 weeks for a single-storey one at the rear.
Ground and heritage controls drive many of the design decisions. The centre, north and west of the town sit on London Clay, so foundations are designed for clay that shrinks and swells, while the south and east are on chalk. Surface water, not river flooding, is the borough's main flood risk, which makes drainage from a new roof part of the design. In any conservation area side extensions need planning permission, and some of the borough's heritage Article 4 directions also cover rear extensions. For a house inside the Green Belt, whose boundary the council says has not changed since the 1940s, the test is whether an extension adds disproportionately to the original house. Designs are checked against the council's 2004 householder guidance, and the route is confirmed for each house before design.
What we build
Push out into the garden to create a bright kitchen-diner or family room, often achievable under Permitted Development.
Add space across two floors at once, gaining extra living space below and a bedroom or bathroom above.
Combine a rear and side-return extension into one L-shaped footprint for a dramatic increase in ground-floor space.
Reclaim the narrow, underused alley beside Victorian and Edwardian homes to widen and flood the rear with light.
Open the back of the house into a single sociable hub built around cooking, dining and family life.
Roof lanterns, rooflights, bi-fold and sliding doors that pour daylight deep into the new space.
Our nearest finished extension
Greenwich, London · about 15 miles from Epsom
Opening the rear of a 1930s semi into one room meant removing a load-bearing wall between the existing kitchen and the new extension, on a site where a narrow side passage was the only route for materials in and spoil out. The new ground-floor shower room also had to be formed within the existing rear lobby, well away from the original layout's plumbing.
The structural opening was formed with a steel beam cased into a shallow flush bulkhead that follows the line of the removed wall, keeping the ceiling clean and the sightline from kitchen to garden completely open. Deliveries were sequenced in small daily loads through the side passage to keep the neighbouring boundary clear, and services for the new shower room were routed within the extension's floor build-up so no boxing-in was needed in the finished rooms.
View this projectExtension FAQs
Straight answers on house extensions in Epsom.
When it goes beyond Permitted Development, or when a conservation area or Article 4 direction takes the relevant rights away. A single-storey rear extension within the size limits can be Permitted Development, and outside conservation areas a larger one may go through prior approval, which takes around 6 to 8 weeks. A two-storey rear extension in a conservation area, or one covered by a heritage direction, needs a full application, with a standard decision taking 8 to 13 weeks.
Free Cost Proposal
Tell us about the project. We'll arrange a free site visit, then send a clear, itemised Cost Proposal.
“The attention to detail and absolute financial transparency provided by Grand Innovations completely redefined our expectations of what a home renovation could be. High standard of work, the extension is beautiful and has added so much value onto our home. Really appreciated the weekly billing, rather than a big amount upfront.”
