Kitchen Extensions Grays
Rear, side return and wraparound kitchen extensions in Grays, the room, the services and the kitchen built as one job.
- Rated 4.9 from 31 reviews on MyBuilder
- Guide from £45,000 (London-derived)
- Free site survey, itemised quote
A kitchen extension in Grays starts with which house you have. The VOA figures put 29% of homes here in terraces and 32% as semi-detached or detached. The choice is usually between a side return infill, where a terrace has a back addition, and a full rear or wraparound addition on a semi. Thurrock judges both against its Residential Alterations and Extensions design guide. We build the shell, bring the steel into the house and fit the new kitchen in one continuous programme.
For Grays, on London-derived ranges a rear kitchen extension of about 30 square metres typically costs £45,000 to £97,500 excluding VAT, or £60,000 to £100,000 for a side return; Essex work generally runs below that. GS Renovation Ltd, a building contractor based in Potters Bar, does the work in Grays: the structural engineer we appoint designs the foundations and steel, we build the room and fit the kitchen, and a registered electrician certifies the electrics.
Price guide
| Work | Indicative range |
|---|---|
| Rear kitchen extension, about 30 square metres, ex VAT | £45,000 to £97,500 |
| Side return kitchen extension, standard to high specification | £60,000 to £100,000 |
| Wraparound kitchen extension, standard to high specification | £80,000 to £130,000 |
| Side return build rate, per square metre of new floor | £2,400 to £3,200 |
| Kitchen supplied and fitted within the extension | £5,000 to £14,000 |
| Structural engineer's fee | £950 to £2,500 |
Indicative London ranges (Resi, MyBuilder and Checkatrade, 2026), not a quotation. Essex work generally runs below the London figures; your price follows a site visit. Prices checked September 2026. Full breakdown: Extension Cost and Planning Guide.
Quick estimate for Grays
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Side return infills on Grays terraces are kept low at the boundary
On a Grays terrace with a back addition, the side return is where the extra kitchen space comes from, and Thurrock standard 5.2.2 says that infill should sit as close to 2m high along the boundary as reasonably possible. That shapes the roof before anything else. A low eaves on the neighbour's side usually means a lean-to or a sloping glazed roof rising towards your own back wall, rather than a tall parapet. Gutters and downpipes then have to be kept within your own side of the line.
The height limit also decides where the light comes in: roof glazing does the work that a side window cannot, so the roof lights are drawn early and priced with the structure. We set out the boundary line on site before the footings are dug, so the wall that ends up against next door is exactly where the drawings put it, and the neighbour can see that it is. Thurrock notes that building on a shared wall or digging near next door can fall within the Party Wall etc Act 1996. You, as building owner, serve any notice before we start.
Housing in Grays
Take the 17,360 or so homes the valuation list gives Grays: 30% flats, 70% houses, 14% from before 1919, 25% interwar and 61% post-war. A terrace kitchen extension in Grays starts in a narrow side return, and 29% of homes here are terraced.
Two sight lines from the neighbour's window set the size in Grays
Thurrock tests a Grays extension against the nearest neighbouring window in two ways. Under standard 4.2.2 its height should not break a 45 degree plane taken from the middle of the nearest ground floor window next door. Its depth and width should not normally break a 60 degree horizontal plane taken from the middle of that same window. Both are measured from the neighbour's side, so the survey needs their window positions as well as your own house.
Where the extension needs a planning application, those two lines, not a round number of metres, are what fix how far back and how high a rear kitchen can go on a semi. Your designer draws them on the plan and the elevation. When we price, we price the extension those lines allow, and we flag early if a deeper room would push past them, because that changes the roof, the steel and the programme. It is cheaper to settle this on paper than after the footings are poured.
Pitched roofs and flat roofs each carry a Grays condition
A pitched roof over a single storey rear kitchen in Grays should normally have its ridge below the cill of the first floor windows, which Thurrock sets out in its guidance. On a semi with low bedroom windows, that can flatten the pitch more than people expect. A shallow pitch then needs a roof covering rated for that angle, and the tiles or sheet material are chosen with that in mind.
Flat roofs bring a different point. Thurrock says the flat roof of a rear extension should not normally become a terrace or balcony unless there are privacy measures for the neighbours. If you want to step out onto the new roof from a bedroom, that has to be designed and shown from the start. Otherwise we build the roof as a roof, with no access door and a simple edge.
A larger rear kitchen under prior approval brings a neighbour consultation in Grays
A house owner in Grays can take the larger single storey rear extension route under prior approval rather than a full application, within the national size limits. None of Thurrock's seven conservation areas is in Grays, which removes one common bar to that route. Thurrock then consults the adjoining neighbours and gives them at least 21 days to respond. That window sits before any start date we can give, so the programme is built around the decision rather than a hopeful guess. We use those weeks to have the steel designed, confirm the kitchen layout and prepare the building regulations submission, so nothing waits once the answer arrives.
Flats are a separate case. A flat has no householder permitted development rights, so any kitchen extension to a flat needs a planning application and, on a leasehold, normally the freeholder's consent as well. The VOA figures put 30% of Grays homes as flats. If yours is one of them, the design route starts with those two approvals, and we plan the build once both are in hand. The structure itself then follows the same sequence as a house extension.
- Utility rooms and larders at the back of the extension
- Floor levels matched through the old opening
- The kitchen itself fitted under the same contract as the build
VOA Council Tax stock of properties, March 2025, for all 5 statistical areas in Grays. Counts rounded by the VOA.
Trusted Kitchen Extensions in Grays
We run a kitchen extension as one job from the footings to the worktops, so the steel, drainage, glazing and kitchen fit-out follow one programme with one team on site. The structural engineer we appoint sizes the steel, and building control inspect each stage as the work reaches it. Your designer or agent handles the planning side, and we build to the approved drawings. You get a written quotation after a site visit, and the price covers the kitchen fit-out as well as the shell.
- Cooker extract taken outside through the new roof or flank wall, not recirculated
- Old kitchen kept in use until the new shell is weathertight
- Itemised pricing, so you can see what every stage costs
Giorgio is an excellent and intelligent workman, and with very reasonable prices! He installed a kitchen extractor fan in a complicated situation…
George was brilliant. Lovely bloke, very reasonably priced and a perfectionist to boot. He completed our small kitchen renovation with care and great…
My husband and I are extremely pleased with the work. The standard of the work is outstanding and Saiid has a great eye for detail and will not leave…
FAQ
Frequently Asked Questions about Kitchen Extensions Grays
What should I budget for kitchen extensions in Grays?
A Grays budget for kitchen extensions should sit within £45,000 to £97,500 excluding VAT for a rear kitchen extension of about 30 square metres (London-derived) and add a contingency for what the RM17 survey cannot see. In post-war suburban housing the unknowns sit behind plaster and under floors, so GS Renovation prices what is visible and names the rest. The Thurrock Council building control fee belongs in the same budget.
Does a kitchen extension in Grays need planning permission?
Some do and some do not. A house may be able to extend under permitted development or the prior approval route for a larger single storey rear extension, where Thurrock consults adjoining neighbours for at least 21 days. A flat has no householder permitted development rights, so its extension always needs an application. Your designer confirms the route before we price the build.
How high can a side return kitchen be on a Grays terrace?
Thurrock standard 5.2.2 asks for a single storey rear infill to sit as close to 2m high along the boundary as reasonably possible. The roof then rises away from that low edge towards your house. That usually points to a sloping roof with glazing, which keeps the boundary low and still brings light into the middle of the kitchen.
How deep can a rear kitchen extension go on a semi in Grays?
On a planning application, the limit comes from sight lines rather than a fixed depth. Under Thurrock standard 4.2.2 the extension should not break a 45 degree plane in height, or normally a 60 degree horizontal plane in depth and width, both measured from the middle of the nearest neighbouring window. Your designer plots both. Under permitted development or prior approval, the national depth limits apply instead.
Can the flat roof of a Grays kitchen extension be a terrace?
Only with privacy measures for the neighbours. Thurrock says flat roofs of rear extensions should not normally be used as terraces or balconies without them. If you want roof access, the screening, balustrade and door need to be on the drawings from the start, because adding them later means a fresh application and a different roof build.
Can a ground floor flat in Grays have a kitchen extension?
It can, but only with a planning application, because a flat has no householder permitted development rights. On a leasehold flat the lease will normally require the freeholder's consent too. With both approvals in hand, the build itself is the same as for a house: footings, drainage, steel into the rear wall, roof, glazing and then the kitchen.
Do you fit the new kitchen as well as building the extension?
Yes. We run the shell and the kitchen fit-out in one programme, so the plumbing and electrical first fix go in while the walls are open and the units follow straight after plastering. One team means no gap between builder and kitchen fitter, and no argument about who fixes a wall that is out of level.
What happens to the drains when a kitchen is extended?
The new sink and appliances need a waste route, and any existing drain or inspection chamber under the new floor has to be dealt with. That can mean moving a manhole, adding an access point or building over a shared drain with the water company's agreement. We survey the runs before the footings are set out so none of this is found halfway through.
Which design guide does Thurrock use for Grays house extensions?
The Residential Alterations and Extensions design guide. It replaced the residential alterations and extensions content that used to sit in the annexes of the 1997 Borough Local Plan. Its standards cover rear infills, sight lines to neighbouring windows, roof heights and flat roof terraces, which are the points a kitchen extension design is tested against.
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