Watford, Hertfordshire
Bungalow rear extension in Watford
Single-storey rear extensions that keep everything on one level. We design, get the approvals for and build rear extensions for bungalows in Watford and the surrounding area, with one contract from the first survey to building control sign-off.
Watford and its postcode districts WD1, WD17, WD18 and WD24 are part of our Hertfordshire coverage. For bungalows in Hertfordshire, a rear extension is the usual way to add space without adding stairs.
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 bungalow rear extension cost in Watford?
Guide prices for a bungalow rear extension in Watford start from our East of England rate of £1,960–£3,180 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) | £23,500–£38,000 |
| 4 m wide × 6 m deep (24 m²) | £47,000–£76,500 |
These are guide ranges; the written quote after the survey is the figure that counts.
Do you need planning permission for a bungalow rear extension in Watford?
The planning route for a bungalow rear extension in Watford is set by England's householder rules and your council.
English permitted development (Class A) allows a single-storey rear extension of 3 metres on a terraced or semi-detached house and 4 metres on a detached one, measured from the original house, with a maximum height of 4 metres and eaves of no more than 3 metres within 2 metres of a boundary.
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. Before any drawing we look up the property's history with the council, because earlier extensions and removed rights change the answer.
What are homes in Watford like to extend?
Post-war semis and newer estates are typical of Watford, 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 bungalow rear extension in Watford comes together
Survey visit
We visit free of charge, measure up, check access, drainage and neighbours' extensions, and note what you want the room to do.
Drawings and budget
Floor plans and elevations for the options, each with a guide price.
Planning and regulations
We take the design through the right planning route, then produce the construction drawings and engineer's calculations for building control.
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.
Bungalow rear extensions near Watford
From Watford, the nearest places we also cover are West Watford (0.9 miles) and Bushey (1.7 miles).
- Bungalow rear extension in West Watford
- Bungalow rear extension in Bushey
- Bungalow rear extension in North Watford
- Bungalow rear extension in Croxley Green
- Bungalow rear extension in Northwood
Other work in Watford:
FAQ
Bungalow rear extension questions in Watford
What postcode areas do you cover around Watford?
Including WD1, WD17, WD18, WD24 and WD25, and the surrounding Hertfordshire area.
Do I need planning permission for a rear extension in Watford?
Often not for a single-storey rear extension of up to 3 metres (4 metres on a detached house) under permitted development, or up to 6 or 8 metres with prior approval, unless the house is in a conservation area or its rights have been removed.
Do I need to move out?
Rarely; the opening into the bungalow is made late in the build.
How much does a bungalow rear extension cost in Watford?
As a guide, £1,960–£3,180 per square metre including VAT for a standard specification. For example, 3 m wide × 4 m deep (12 m²): about £23,500–£38,000 at that rate. Your written price follows the survey.
Do you handle building control in Watford?
Yes. We apply to the council or a registered building control approver and hand over the completion certificate.
Can I get a price without a visit?
Our online guide-price tool gives a range in a couple of minutes. A written price needs a survey.