Extensions built to match the house
A full masonry room — footings, walls, roof and glazing — finished so it reads as though it was always there.
- Groundworks, masonry, roofing and glazing by one team
- Building regulations handled from application to sign-off
- Certass registered with a 10 year guarantee
East Grinstead showroom · covering Sussex, Surrey and Kent
10/10 on Checkatrade
From 149 verified customer reviews
Certass registered
Fully insured and SafeContractor approved
10 year guarantee
On every product we supply and install
Family run since 2007
Our own fitters — never subcontracted out
Why an extension
The version that becomes part of the house
Where a conservatory adds a room beside the house, an extension adds one to it. Structurally, thermally and legally it is the real thing.
Insulated cavity walls, a proper roof and floor build-up, and a knock-through into the existing rooms so the space flows rather than being somewhere you go through a door to reach.
It costs more and takes longer than any other route. What you get is floor area that counts as part of the house on a survey, and a room indistinguishable from the ones it joins.
- Insulated cavity walls built to current standards
- Tiled or flat roof to match the existing house
- Structural openings and beams into the existing rooms
- Plastering, electrics and making good included
Benefits
What an extension gives you
Genuinely part of the house
Same walls, same roof, same standards — not a room bolted onto the back.
Open plan if you want it
A structural opening lets the new room and the old one work as one space.
Warm as the rest of the house
Insulated floor, walls and roof built to current building regulations.
One team, footings to finish
Groundworks, masonry, roofing, glazing and plastering by us.
Signed off properly
Building control involved from the start, with the certificate at the end.
Adds value
Well-built extra floor area is one of the few improvements that pays back on sale.
Worth knowing
What decides the price before we start
Two things move the number more than the size of the room: what is in the ground, and what is over the opening.
Ground conditions, drain runs and the depth the footings have to go set the cost of everything below floor level, and none of it is visible until you dig. We check what we can at survey and tell you where the risk sits.
Above, the width of the opening into the existing house decides the size of the steel. A wider opening is a better room and a bigger beam. Both get priced properly rather than guessed.
Other rooms
Sure an extension is the right route?
It is the most involved option. Here is what the alternatives give you for less.
Conservatories
The most glass for the money, and the quickest way to add a room. Modern roofs mean they work all year rather than just in spring.
Explore conservatories
Orangeries
Brick piers, a flat perimeter roof and a glazed lantern over the middle. Reads as part of the house rather than bolted onto it.
Explore orangeries
Extensions
A full masonry room built to match the house — foundations, walls, roof, glazing and the making good afterwards.
Explore extensions
Garden Rooms
An insulated, solid-roofed room you can use in February. Somewhere between a conservatory and an extension, at a price to match.
Explore garden rooms
Sun Rooms
A light-filled room with a solid roof and glazing on the sides — the warmth of an extension with the daylight of a conservatory.
Explore sun rooms
Verandas
A glazed roof over a terrace or decking. Shelter without enclosing anything, so you use the garden for more of the year.
Explore verandasQuestions
Extension questions
Can’t see what you need? Call 01342 410079 and we’ll answer it properly.
Do I need planning permission for an extension?
Does it need building regulations approval?
How long does an extension take?
Can you knock through into the existing house?
Do you do the whole job or just the shell?
Where we work
House extensions in East Grinstead and across Sussex, Surrey and Kent
We’re based on Station Road in East Grinstead, where West Sussex meets Surrey and Kent, and our own team works throughout all three counties.
Towns we cover include
- East Grinstead
- Crawley
- Horley
- Haywards Heath
- Burgess Hill
- Horsham
- Crowborough
- Tunbridge Wells
- Tonbridge
- Sevenoaks
- Redhill
- Reigate
- Caterham
…and the villages in between. If you’re in Sussex, Surrey and Kent, the answer is almost certainly yes.
Free quotations
Thinking about an extension?
Book a free survey and we’ll tell you what’s possible, what it involves and roughly what it costs.