01
House extensions
Single & double-storey extensions that add real space and value — engineered before a brick is laid.
Explore extensions
est. 2009 · Family-run in Slough
Building work,
Building work,
done properly.
Considered extensions, loft conversions and renovations for homes across Slough, Windsor and the surrounding villages — fixed quotes, fully insured, finished beautifully.
Book a free site survey
or call 01753 000 000
★★★★★4.9 · Checkatrade
15+years building
across Slough
across Slough
200+homes
transformed
transformed
15
years
4.9
Rated excellent
from 120+ verified reviews on Checkatrade & Google
from 120+ verified reviews on Checkatrade & Google
Accredited & insured — building you can trust
FMB
TrustMark
Checkatrade
CHAS
Gas Safe
01 · Why homeowners trust us
No deposits walked off with.
No deposits walked off with.
No surprise final bills.
Building work is a leap of faith. We remove the risk that makes it stressful — in writing, every time.
Insured & guaranteed
Every project fully insured and backed by a written workmanship guarantee.
Fixed written quotes
The price we agree is the price you pay. No surprises halfway through.
Staged payments
You pay as work completes — never a large deposit up front.
Local & accountable
A Slough team with a local name and reputation to protect.
02 · What we build
From a single room to
From a single room to
a whole new floor.
One local team, one standard of finish — design, build and project management under one roof.
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02
Loft conversions
Turn dead roof space into a bedroom, office or en-suite.
Explore lofts
03
Kitchens & bathrooms
Full design-and-build fits, managed from first drawing to final tile.
Explore fits
04
Renovations
Whole-home refurbishments and structural work that bring tired properties back to life.
Explore renovationsNot sure where to start? Get free, no-obligation advice →
03 · Our work & reviews
Proof, not promises.
Real projects, completed for real homeowners across Slough and the surrounding area.
Featured · Extension
Two-storey side extension
A four-month transformation in Langley — fixed price, finished a week early, handed back spotless.
★★★★★
"They quoted a fixed price, stuck to it, and finished a week early. You'd never have known there was building work going on."
ST
Sarah T.Langley · House extension
★★★★★
"After a bad experience with another builder, Hargreaves restored our faith entirely. Faultless work."
DM
David M.Burnham · Loft conversion
04 · Good to know
Straight answers,
Straight answers,
no jargon.
The questions homeowners ask us most — answered honestly, before you ever pick up the phone.
Ask us anythingEvery project is different, but as a guide, single-storey extensions typically start from £30,000 and loft conversions from £35,000. After a free site survey we give you a detailed fixed quote — no guesswork, no hidden extras.
Many extensions and lofts fall under permitted development, but not all. We'll tell you exactly where you stand and handle the drawings, applications and building control on your behalf if needed.
A typical single-storey extension takes 10–14 weeks and a loft conversion 6–8 weeks. We agree a clear timeline before we start and keep you updated at every stage.
You pay in stages as work is completed — never a large deposit up front. Every milestone is agreed in writing before we begin.
We keep the site clean and contained, protect your home throughout, and work to agreed hours. We've completed hundreds of projects in occupied homes and leave it spotless each day.
Yes — fully insured, with a written workmanship guarantee on every project. We're accredited members of the FMB, TrustMark and Checkatrade.
Let's begin
Ready to start your project?
Book a free site survey and get a no-obligation written quote. No pressure, no jargon — just honest advice from a local team.
Free site survey
Fixed written quote
We reply within 24 hours