Grays house extensions
We design and build house extensions for homes in Grays and the surrounding Essex area, with guide prices adjusted for the region.
- Postcode districtsRM15, RM16, RM17, RM18, RM20
- Price regionEast of England (×1.06)
- Planning rulesEngland
- Site visitFree, no obligation
Choosing the right extension in Grays
The East of England mixes market-town terraces, inter-war semis and modern estates. Clay soils are common in parts of the region, which can affect foundation design.
For many houses here, single-storey rear extensions, double-storey extensions or bungalow extensions gives the most useful space for the budget.
Planning and building control in Grays
In England a single-storey rear extension can usually go up to 3 m beyond the original rear wall of a semi-detached or terraced house, or 4 m on a detached house, without a planning application, provided it is no more than 4 m high, keeps eaves to 3 m within 2 m of a boundary and, with other buildings, covers no more than half the land around the original house. The larger home extension prior approval scheme raises those depths to 6 m and 8 m, with neighbours notified and a 42-day decision.
In England a single-storey side return infill is often permitted development if it stays within the height limits and is no wider than half the width of the original house. Conservation areas, listed buildings and flats always need an application, and the boundary wall usually brings in the Party Wall Act.
In a conservation area, national park, National Landscape, the Broads or a World Heritage Site the permitted development limits are tighter (no side or two-storey extensions without an application). Listed homes need listed building consent, and if permitted development rights have been removed, any extension needs an application.
Building regulations approval is separate from planning. In England you can use the council's building control team or a registered building control approver; a full plans application gets the drawings checked before work starts, and the inspector signs the work off with a completion certificate.
Applications are decided by the local planning authority (your district, borough or unitary council).
Popular extension prices in Grays
We publish guide prices so you can budget before anyone visits. For Grays they are adjusted by ×1.06, the factor we use across East of England.
| Extension type | Example size | Standard spec (inc VAT) |
|---|---|---|
| Single-storey rear extensions | 20 m² | £43,000 – £55,500 |
| Conservatory replacement extensions | 14 m² | £31,500 – £41,000 |
| Side return extensions | 11 m² | £27,500 – £35,000 |
| Orangery extensions | 16 m² | £47,000 – £59,500 |
| Extensions over a garage | 12 m² | £26,500 – £34,500 |
| Kitchen extensions | 20 m² | £44,500 – £56,500 |
| Wraparound extensions | 25 m² | £60,500 – £77,000 |
Covering Grays and nearby
Site visits are available across Grays (RM15, RM16, RM17, RM18, RM20). Nearby, we also take on projects in South Ockendon (3 miles), Stanford-le-Hope (6 miles), Basildon (9 miles), Brentwood (10 miles), Billericay (11 miles). For homes towards Kent, Gravesend is around 3 miles away.
Choose an extension type
- Flat roof extensions · from £22,000
- Utility and boot room extensions · from £14,500
- Building regulations for extensions · from £950
- Kitchen extensions · from £28,500
- Bungalow extensions · from £27,500
- Planning permission for extensions · from £350
- Pitched roof extensions · from £23,500
- Side extensions · from £23,000
- Bedroom extensions · from £27,500
- Double-storey extensions · from £40,000
- Glass box extensions · from £31,500
- Porch extensions · from £4,200
- Side return extensions · from £19,000
- Orangery extensions · from £31,500
- Annexe extensions · from £58,000
- Home office extensions · from £16,500
- Single-storey rear extensions · from £22,000
- Timber frame extensions · from £22,000
- Extension plans and drawings · from £1,250
- Wraparound extensions · from £38,000
- Extensions over a garage · from £25,000
- Conservatory replacement extensions · from £21,000
Free site visit
First, a site visit: we look at the house, garden, access and drains and listen to what you need.
Design and approvals
Once the layout is agreed, we deal with the council: planning permission or written confirmation that none is needed, plus building control.
Fixed written price
The price is fixed in writing once the design is settled, with a clear programme and payment stages.
Build and sign-off
Our team builds the extension, keeps you updated weekly and finishes with building control sign-off.
Questions about extensions in Grays
How much does an extension cost in Grays?
Using our East of England factor (×1.06), a standard-spec single-storey extension of 20 m² is a guide £43,000 to £55,500 including VAT, and a 32 m² two-storey extension £61,000 to £80,000. Your written price follows the survey.
Will my neighbours need to be told?
If you apply for planning or prior approval the council notifies them, and in England party wall notices may be needed for work near a shared boundary.
Can I get a price before anyone visits?
Yes. This page shows guide prices adjusted for Grays, and the guide-price tool gives a range for your own size and finish in about a minute.
Do you handle building regulations?
Yes. We prepare the drawings and calculations, submit them and book inspections, ending with a completion certificate.
Book a free site visit in Grays
We will measure up, check the planning position and give you honest guide figures.
- Free, no-obligation site visit
- Planning route checked before you spend on drawings
- Written price once the design is agreed
- Building control sign-off at the end
Prefer to talk? Call 0800 088 6341 or .
Book a free site visit
Tell us a little about the project and we will arrange a time.