Rear & side extensions
Single and double storey, wrap-arounds and side infills. Most add the room people actually wanted rather than the one that fitted the drawing — which is a conversation at design stage, not on site.
Extensions & loft conversions · Acton W3
More house,
without moving.
Rear and side extensions, loft conversions, kitchens and bathrooms across West London. Design, fixed quote, build and snagging — one firm from first drawing to final handover.
Drawings to doorstep, one firm.
Fixed quote, heldActon & West London
Rated 4.9
From 7 customer reviewsOne firm
Drawings to handover, no hand-offsFixed quote
Priced from drawings, then heldInsured
Public liability and works coverTarnbeck is an invented firm, so every line above is an example — this strip is where a real firm's rating, registration and insurance position would sit.
What we build
Five things, and all of them properly.
Loft conversions
Dormer, hip-to-gable and rooflight conversions. The head height and the stair position decide whether a loft works at all, and both get checked before anything is priced.
Kitchens
Supplied and fitted, or fitted to units you have bought. Services moved properly, worktops templated rather than guessed, and the appliances in before the worktop goes on.
Bathrooms
Full refits including the first fix nobody sees. Tanked where it needs tanking, falls formed correctly, and the extraction actually sized for the room.
Full refurbishment
Whole houses taken back and put together again — rewire, replumb, plaster, joinery, decoration. One programme and one point of contact rather than five trades to chase.
Typical costs
Roughly what things cost.
Published because the first question everyone has is whether they are even in the right ballpark, and being told “it depends” helps nobody. A real price comes from drawings.
Loft conversion
£45k – £85k
Rooflight conversion at the lower end; a full dormer with an en-suite at the upper.
Single-storey extension
£55k – £110k
Driven by footprint, glazing and whether the kitchen moves into it.
Kitchen
£12k – £35k
Fitting only at the lower end; supplied, fitted and re-serviced at the upper.
Bathroom
£8k – £20k
Like-for-like refit through to a reconfigured room with underfloor heating.
Every figure above is an illustrative sample written for this example, not any firm's own pricing. They exist to show how a guide-cost section would work — their real brackets would replace them before this page went anywhere near a customer.
Start an enquiry
Five questions, then a consultation.
No instant price, because a real one comes off drawings. This just makes the first conversation a useful one.
Our work
Extensions, lofts, kitchens, bathrooms.
These are drawings, not photographs. There is no photography online yet, and generic contractor stock imagery says the opposite of what a firm wants it to. Their own job photos would fill these frames.
How it works
Consultation, design, build, handover.
- 01
Consultation
We come and look, talk through what you are trying to achieve, and say plainly whether it is buildable and roughly what bracket it falls in. No drawings, no charge.
Free - 02
Design & fixed quote
Drawings, structural calculations and the planning or building-control route. Then a fixed quote priced off those drawings — because a quote priced off a conversation is a quote that changes.
Two to four weeks - 03
Build
One programme, one site manager, and a weekly update with photographs. Payment against completed stages rather than up front, so what you have paid for is always work that exists.
Per the programme - 04
Snagging & handover
We walk the job with you and write the snag list down rather than promising to remember it. Certificates, warranties and building-control sign-off handed over together.
Included
Timings and the payment-stage wording are examples written for this demo — their own terms would replace them.
What people say
4.9 from 7 reviews.
★★★★★“Priced it off the drawings and the final invoice matched the quote. Two variations along the way, both agreed in writing before anyone did anything.”
★★★★★“Told us up front that the stair would have to come off the landing and lose us a cupboard. Better to hear that at the start than discover it at first fix.”
★★★★★“Weekly photos meant we could follow it while we were out of the house. Snag list was written down and worked through rather than argued about.”
Written for this example — nobody said these things. On a real site this block carries your own reviews, quoted with the customer's first name and the job, next to the cost guide above. Price and proof sitting together is most of the argument.
Questions
Planning, party walls, payments.
Will I need planning permission?
Often not. A great many rear extensions and loft conversions go through under permitted development, which is a certificate rather than an application and is considerably quicker. Whether yours does depends on depth, height, the roof form and whether the house has already been extended. We check it at the consultation, because the answer changes the programme by months.
What is a party wall agreement?
If work affects a shared wall or you excavate near a neighbour's foundation, they have a statutory right to notice — usually two months for a party structure notice. It is a process rather than a negotiation, and neighbours cannot stop the work, but ignoring it can stop it. Serving notice early is the single easiest way to avoid losing time later.
How long does a project take?
A kitchen is two to four weeks on site, a loft conversion eight to twelve, a single-storey extension twelve to eighteen. Add the design and consent stage before any of it. The programme you get with the quote gives dates by stage, and you are told when something moves rather than finding out.
How do payments work?
Against completed stages, not in advance. A deposit covers materials ordered up front, then each subsequent payment falls due when a defined stage is finished and you have seen it. That way the money paid and the work built stay in step.
Who deals with building control?
We do. Extensions and loft conversions need building regulations approval separately from planning, covering structure, insulation, fire escape and stairs. We arrange the inspections and hand you the completion certificate at handover — you will need it when you come to sell.
Where we work
Across West London.
- Acton W3
- Ealing W5 / W13
- Chiswick W4
- Shepherd's Bush W12
- Hammersmith W6
- Brentford TW8
- Northfields W5
- Kensal Green NW10
Example coverage list — the areas they actually work in would go here.
No obligation
Tell us what you are planning.
Photographs, a sketch, or just an idea. The consultation is free and you get a straight answer on whether it is buildable and roughly what bracket it falls in.