
House extensions and renovations across Milton Keynes
A family run building company. Over ten years in the trade, one team on site, and the same people managing the job from the first visit to handover.
Five star
Google reviews
Please check out our many five star Google reviews.
£5m
Public liability
Fully insured. Certificate available on request.
10+
Years’ trade experience
Behind every project we price and build.
Family run
Milton Keynes based
The majority of our work comes through recommendations and repeat customers.
Rated by our customers on Google, with many five star reviews.
Please check out our many five star Google reviewsWhat we do
Three types of project make up most of our work, supported by the full range of skilled trades and expertise required to deliver each project to a consistently high standard.

House extensions
Single and double storey extensions, built and managed start to finish.
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Kitchen and open plan extensions
Kitchen, dining and family space in one, with the structure to open it up.
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Full property renovations
Whole house refurbishments, from strip out to the last coat.
Read moreExtensions and open plan living space
If you have outgrown the back of the house, an extension is usually the better answer than moving. It costs less than the stamp duty, the agents and the upheaval, and you end up with the house you wanted in the first place.
Most of the value is in the parts you never see again. Foundations deep enough for the ground conditions and the trees nearby, a steel sized by an engineer rather than guessed at, brickwork matched properly, and a roof detail that still holds in year ten.

Recent work
Photographed at the working stage as well as the finished one, because that is where you can see how something was built.
Built from a timber frame rather than bought as a unit, so the recesses, the fire opening and the shelving all landed exactly where they were wanted. Boarded, taped and skimmed, then finished with slatted panels and concealed lighting.
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Most of our work comes from recommendations
The majority of our work comes through recommendations, repeat customers and word of mouth. The reviews below come from our Google profile and are reproduced word for word.
The guys did a fabulous job, friendly, professional and clearly taking pride in what they do. Will definitely use them again.
Good honest and knowledgeable work. They gave a fair quote and carried out repairs to my house wall that had some subsidence cracking. The mortar and replaced bricks were all matched well. I would use them again for any other house job.
They did a fabulous job! 10/10. Friendly, professional, full of ideas & willing to listen! Share your vision & they will do what they can to deliver! I would recommend them to anyone.
How a project runs
Five stages, and you always know which one you are in.
First contact
You get in touch, and you get a reply
WhatsApp is easiest, because photographs and drawings go straight over and stay in one thread. We will ask a few questions and arrange to come and look.
The visit
Charlie comes out to see the property
Not a five minute walk round. We look at access, at what the walls are doing and at where the drains run, then talk through what is realistic for the budget you have in mind. If the idea will not work, we say so on the day.
Quotation
A detailed written quotation
You will receive a detailed written quotation setting out the full scope of works, what is included and any exclusions. Where drawings, a structural engineer or Building Control fees are needed, we will make clear whether they sit inside the quotation or are dealt with separately.
On site
The build, with the same team throughout
You are told the week before we start and kept updated each week after that. Site sheeted up, tools away and swept at the end of each day. If we find something unexpected, you hear about it the same day and in writing.
Handover
Sign off, clean up and snagging
Building Control sign off where the project needs it, waste taken away, and a snagging walk round together. We then come back and clear that list.

The people behind the company
On a project of any size you are choosing who will be in your house for weeks or months, who deals with your neighbours, and who tells you when something behind a wall turns out to be worse than expected. That matters as much as the workmanship.
Charlie has been in the building trade for over ten years and prices and runs every job himself. Allison runs the office, which means she answers your messages, chases suppliers and keeps you and the site informed.
About CB Builders & SonWhere we work
Milton Keynes is our core area, with projects undertaken across the surrounding towns and villages. For larger or more substantial projects, our coverage can extend further across Buckinghamshire, Bedfordshire, Northamptonshire, Oxfordshire and beyond.
Each town has its own page, because a Victorian terrace in Wolverton and a nineties house in Shenley Brook End present very different problems.
Strong foundations. Lasting results.
Send a few photographs and tell us what you have in mind. We can usually give you an initial indication of what may be involved and, where appropriate, arrange a site visit so we can assess the project properly.