Hemel Hempstead, Hertfordshire
Kitchen-diner rear extension in Hemel Hempstead
An open-plan kitchen, dining and family room that opens straight onto the garden. We design, get the approvals for and build kitchen-diner rear extensions in Hemel Hempstead and the surrounding area, with one contract from the first survey to building control sign-off.
We cover Hemel Hempstead (HP1, HP2 and HP3) as part of our Hertfordshire work. A kitchen-diner is often the reason people in Hemel Hempstead extend: the back kitchen in post-war semis and newer estates is rarely big enough for a table.
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 kitchen-diner rear extension cost in Hemel Hempstead?
Guide prices for a kitchen-diner rear extension in Hemel Hempstead 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 |
These are guide ranges; the written quote after the survey is the figure that counts.
Do you need planning permission for a kitchen-diner rear extension in Hemel Hempstead?
Planning for a kitchen-diner rear extension in Hemel Hempstead follows the English householder rules.
In England a single-storey rear extension can often be built under permitted development: up to 3 metres beyond the original rear wall of an attached house, or 4 metres on a detached house, no higher than 4 metres, with eaves no higher than 3 metres if any part is 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. 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 Hemel Hempstead like to extend?
Post-war semis and newer estates are typical of Hemel Hempstead, 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 kitchen-diner rear extension in Hemel Hempstead 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.
Design and guide price
Two or three layout options with a guide price for each, so you choose the design knowing what it costs.
Planning and regulations
We take the design through the right planning route, then produce the construction drawings and engineer's calculations for building control.
Build and sign-off
We build to the approved drawings with regular updates, then hand over the building control completion certificate and any guarantees from suppliers.
Kitchen-diner rear extensions near Hemel Hempstead
Neighbouring places we cover include Abbots Langley (3.6 miles) and Berkhamsted (5.0 miles).
- Kitchen-diner rear extension in Abbots Langley
- Kitchen-diner rear extension in Berkhamsted
- Kitchen-diner rear extension in St Albans
- Kitchen-diner rear extension in North Watford
- Kitchen-diner rear extension in Harpenden
Other work in Hemel Hempstead:
FAQ
Kitchen-diner rear extension questions in Hemel Hempstead
How much does a kitchen-diner rear extension cost in Hemel Hempstead?
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.
Can you match the brick or stone on my Hemel Hempstead house?
We source the closest match and show you samples before ordering; reclaimed materials are often the best match on older houses.
Should the sink face the garden?
If the plan allows, an island sink or hob facing the glass is a common choice. It needs a floor-level drain run, which is easy to lay in a new slab.
How long does a rear extension take to build in Hemel Hempstead?
Most single-storey rear extensions take 10 to 16 weeks on site and two-storey extensions 16 to 26 weeks, after design and approvals.
What postcode areas do you cover around Hemel Hempstead?
Including HP1, HP2 and HP3, and the surrounding Hertfordshire area.
Is the site visit in Hemel Hempstead free?
Yes. We visit, measure up and talk through the options with no cost and no obligation.