Walton-on-the-Naze, Essex
Semi-detached rear extension in Walton-on-the-Naze
For homes in Walton-on-the-Naze, a semi-detached rear extension is often the simplest way to gain space without moving. Single or two-storey extensions for semi-detached houses, with side access and one party wall. We take it from survey to completion certificate.
Walton-on-the-Naze sits in Essex, with postcode districts including CO13 and CO14. Where a Walton-on-the-Naze semi already has a small lean-to at the back, we usually replace it rather than extend it.
Book a free site visit
Tell us about the house and we'll call to arrange a free, no-obligation visit.
How much does a semi-detached rear extension cost in Walton-on-the-Naze?
Guide prices for a semi-detached rear extension in Walton-on-the-Naze start from our East of England rate of £2,010–£3,290 per square metre, including VAT. East of England prices run slightly above our West Midlands baseline; clay soils near trees are the main foundation variable.
| Size | Guide price inc VAT |
|---|---|
| 3 m wide × 4 m deep (12 m²) | £24,000–£39,500 |
| 4 m wide × 5 m deep (20 m²) | £40,500–£65,500 |
| 4 m wide × 6 m deep (24 m²) | £48,500–£79,000 |
Your written price follows a measured survey and an agreed design, so it reflects your house, not an average.
Do you need planning permission for a semi-detached rear extension in Walton-on-the-Naze?
Planning for a semi-detached rear extension in Walton-on-the-Naze follows the English householder rules.
Under England's householder permitted development rules you can usually add 3 metres at the back of an attached house, or 4 metres on a detached house, without a planning application, as long as the extension stays under 4 metres high and its eaves stay under 3 metres where it is within 2 metres of a boundary.
A two-storey rear extension can be permitted development in England only if it projects no more than 3 metres, stays at least 7 metres from the rear boundary, matches the existing roof pitch and has obscure-glazed upper side windows. In practice most double-storey rear extensions go through a householder planning application.
If 3 or 4 metres is not enough, England's prior approval route allows 6 metres on a terraced or semi-detached house and 8 metres on a detached house for a single-storey rear extension. Neighbours are consulted, the council decides within 42 days, and the fee is £249, rising to £310 from 8 December 2026.
Conservation areas, National Parks, National Landscapes and the Broads restrict permitted development, and listed buildings always need listed building consent. At the first visit we measure what is there now and tell you which route fits: permitted development, prior approval or a planning application.
What are homes in Walton-on-the-Naze like to extend?
Post-war semis and newer estates are typical of Walton-on-the-Naze, and many have room for a full-width extension. Shrinkable clay is common in the East of England, so foundations near trees and hedges are designed to NHBC-style depth guidance.
How a semi-detached rear extension in Walton-on-the-Naze comes together
Look round and measure
A free visit to see the back of the house, measure it, check the drains and boundaries and hear what you need.
Options and costs
We draw layout options and price each one, so the budget shapes the design rather than surprising you later.
Approvals
Permitted development check, prior approval or planning application, then Building Regulations drawings and structural calculations, plus party wall notices where they apply.
Written price, then build
Once the design and approvals are in place, you get a fixed written price and programme, and we build through to sign-off.
Semi-detached rear extensions near Walton-on-the-Naze
We also build rear extensions for semi-detached houses in nearby Frinton-on-Sea (1.6 miles) and Clacton-on-Sea (6.2 miles).
- Semi-detached rear extension in Frinton-on-Sea
- Semi-detached rear extension in Clacton-on-Sea
- Semi-detached rear extension in Harwich
- Semi-detached rear extension in Felixstowe
- Semi-detached rear extension in Kesgrave
Other work in Walton-on-the-Naze:
FAQ
Semi-detached rear extension questions in Walton-on-the-Naze
How much does a semi-detached rear extension cost in Walton-on-the-Naze?
As a guide, £2,010–£3,290 per square metre including VAT for a standard specification. For example, 3 m wide × 4 m deep (12 m²): about £24,000–£39,500 at that rate. Your written price follows the survey.
Who will build my extension?
Vetted building teams working under contract to us. Your contract is with S&K Property Investments and Improvement Ltd for the design and the build.
How long does a semi extension take?
10 to 16 weeks on site for a single-storey extension.
Will I need a structural engineer?
Yes for the beam over the new opening and usually the foundations; we arrange them and their calculations go to building control.
Do you handle building control in Walton-on-the-Naze?
Yes. We apply to the council or a registered building control approver and hand over the completion certificate.
Can you match the brick or stone on my Walton-on-the-Naze house?
We source the closest match and show you samples before ordering; reclaimed materials are often the best match on older houses.