Established 2006 · Same Team · Custom-Built
Bespoke Home Extension Builders in Milton Keynes
Same Team
Since 2006
Architectural
& Engineering Services
Public Liability
Insurance up to £2M
12 Months
Parts & Labour Warranty
Our contractors are accredited by
Our Work
Latest Projects
See what we've been working on over the past few months
Testimonials
Hear From Our Customers
Crownhill Building Services is proud to publish unscripted feedback
We have completed single storey rear extension with flat roof, large Bi-Fold door, roof lantern and kitchen installation in Crownhill
View Project
"It feels like it has always been here" - said the customer to us on completion - that was one of the best comment we have received.
View ProjectWe Don't Just Build Extensions
Crownhill Building Services delivers every project to the highest standards including personal customer requirements.
Creativity, innovation, ingenuity and the determination to achieve excellence in what we do. If we need to fit kitchen or bathroom, we do that too.
The Future of Home Extensions
Spectra Extensions
Traditional Finish. Built Smarter.
What if you could have a beautiful extension that's indistinguishable from a traditional build — but completed in weeks, not months?
50%
Faster to Build
50%
Lower Carbon
Cutting-edge foundation technology. Advanced composite materials. Precision-engineered components that simply weren't possible a decade ago. No excavation, no concrete trucks, no months of waiting. This is what happens when innovation meets craftsmanship.
Explore Spectra ExtensionsReady to Transform Your Home?
Get in touch today for a free, no-obligation quote. Let's discuss your project and bring your vision to life.
Our Difference
Why Crownhill Building Services?
Wide-ranging Experience
Years of expertise in home extensions
Skilled Tradesmen
Fully qualified and highly skilled professionals on every project
Creative Minds
Innovative ideas that bring your vision to life
Project Management
Inclusive management keeping you informed every step of the way
Perfection Driven
Determination to achieve the perfect result for your home
Customer Reviews
What Our Customers Say
Real reviews from our Google Business Profile
We had some trepidation about undertaking building works but we needn’t have worried. Eric and his team worked extremely hard; they appeared every day and when they couldn’t make it we were notified in advance (and his …
Read more on GoogleWe used Crownhill Building for our two storey side and single storey rear extension. We are very happy with works carried out. Eric is very responsive and project managed the job well. His guys keep their heads down, wor…
Read more on GoogleReally great service and top quality craftsmanship
View on GoogleThe CBS have helped me to even floor upstairs. They have done it perfectly. The Eric and his team were very helpful, communication was on very good level, very recommended.
View on GoogleEric did a great job on my self-contained garage conversion, following the custom designs I requested. The work was done to a good standard, and he was professional and reliable throughout the process. Would recommend.
View on GoogleWe have recently completed our house extension project and are so pleased we chose CBS. The project was completed within timescales initially agreed. Their builders are so humble and always left the site tidy. Other cont…
Read more on GoogleIt was great working with Crown Building Service (CBS) throughout the extending our house process. They were easy to get in touch with and quick to respond to any questions that came up. The project management tool that …
Read more on GoogleI engaged Crownhill to do major work on my ground-floor flat in CMK. At first I was worried, but there was no need. The result was excellent. Thank you.
View on GoogleWe selected crownhill building services for building a bedroom toilet and porch at our house and we are really happy with their work. They have very hardworking builders ,well organised with good time management and thei…
Read more on GoogleExtremely happy with the service that Eric and his team has provided on our extension/garage conversion. The builders were punctual, tidy and have a wealth of experience. Eric's communation was excellent, keeping us info…
Read more on GoogleWe had a conservatory removed and extension built in it's place and a garage conversion. The work on completion exceeded our expectations and the team were great. Smooth process from start to finish
View on GoogleWe would highly recommend Crownhill building services if you are planning on having building works done. Our 4mtr long extension was done by Eric and his team and they made the whole project seamless. From the architect…
Read more on GoogleI have known Eric for a number of years and on this occasion used his company to dismantle a conservatory for a rental property and make good internally and externally, the guys were careful and took care of the existing…
Read more on GoogleLatest News
Is a Double Storey Extension Worth It in Milton Keynes in 2026?
Thinking about a double storey extension in Milton Keynes? Crownhill Building Services explains why extending often makes more financial sense than moving — and what makes MK different. Free site visit.
Read MoreSingle Double or Kitchen Extension: Which Is Right for You?
Single storey, double storey or kitchen extension — which is right for your Milton Keynes home? Crownhill Building Services explains the difference and helps you decide. Free consultation today.
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