Building in Suffolk since 2001

Built to last.
Built for you.

New builds, extensions, renovations and loft conversions across Suffolk. One team, a fixed price, and a finish that holds up twenty years from now.

Get a free quote See recent work

Years trading

412

Projects completed

5 yr

Workmanship guarantee

Subcontractors used

What we do

Four ways we put roofs over Suffolk.

01 / New builds

Ground up

Full residential and commercial new builds. We manage every stage, from foundations and drainage to the final fit-out and certificates.

02 / Extensions

More house, same address

Single storey, double storey, side returns and wrap-arounds. Designed and built in-house, so nobody passes the blame.

03 / Renovations

Old bones, new life

Kitchens, bathrooms and full interior renovations, including listed and period properties handled with the care they need.

04 / Loft conversions

The room you already own

Bedroom, office or studio. Planning, structural steels, insulation, stairs and finishing, all under one contract.

Selected work

Recent projects

Full portfolio →

New build · 2025

Four-bed family home

Ipswich · 11 months · timber frame

Renovation · 2025

Full kitchen overhaul

Bury St Edmunds · 7 weeks · structural opening

Loft conversion · 2024

Master suite & ensuite

Sudbury · 9 weeks · dormer & steels

Brickwork detail with a spirit level across a fresh course

A house is judged at the joints. So are we.

How it works

Four steps, no surprises.

The same sequence on a single bathroom as on a four-bedroom build. You always know who is on site and what happens next.

Site visit

We come out, measure up and listen. Free, and no hard sell afterwards.

Fixed quote

Written and itemised, line by line. The price we quote is the price you pay.

Build

One site manager, our own tradespeople, a tidy site and a Friday update.

Handover

Snagging closed off, certificates issued, five-year guarantee in writing.

Cornerstone team on site reviewing drawings against a timber frame

Who we are

Suffolk builders you can rely on.

Cornerstone Construction has been building across Suffolk for over 25 years. We started as a small team of tradespeople with high standards and a straightforward attitude. That hasn't changed.

Every project gets the same attention, whether it's a single room or a full new build. Our clients come back to us. Their families come to us. That tells us everything.

Fully insured
Free quotes
Local tradespeople
Fixed price contracts
No subcontractors
5-year guarantee

Client reviews

On time, on budget, and the site was swept every night. We wouldn't hesitate to use them again.

Sarah & Mark Holloway · extension, Ipswich

From the first meeting to the final handover the whole experience was first class. Our loft conversion has changed how we live in this house.

Reliable, honest and brilliant at what they do. They turned a tired old house into somewhere we're genuinely proud of.

Get in touch

Ready to start your project?

Tell us what you have in mind. We'll come out, take a look and give you a straight, honest quote. No obligation, no hard sell.

Phone: 01284 758 240
Email: info@cornerstoneconstruction.co.uk
Based in: Bury St Edmunds, Suffolk
We cover: Ipswich · Sudbury · Stowmarket · Woodbridge

Built to last.Built for you.