Our Extension Services
Single storey, double storey, rear and kitchen extensions in Milton Keynes
Home Extensions for Every Need
Crownhill Building Services specialises in home extensions across Milton Keynes. Whether you need a single storey rear extension to open up your kitchen, a double storey extension for extra bedrooms, or a complete kitchen extension, we manage every project in-house from design to handover.
With over 20 years of experience and hundreds of completed projects, we bring the same trusted team and attention to detail to every build. Choose your extension type below to learn more.
Single Storey Extensions
Add ground floor space for a bigger kitchen, home office, utility room or family room. Often achievable under permitted development with no planning permission needed.
Learn moreDouble Storey Extensions
Maximise your space by building up and out. Add bedrooms and bathrooms upstairs with living space below — the most space-efficient way to extend your home.
Learn moreRear Extensions
Our most popular project type. Extend into your garden to create open-plan kitchen-diners, family rooms, or living spaces with bi-fold doors to the garden.
Learn moreKitchen Extensions
Create the open-plan kitchen-diner your family deserves. We handle everything from structural work to kitchen fitting, including plumbing, electrics and underfloor heating.
Learn moreEvery Extension Includes
Design & Planning
From concept to approval, our architectural partners bring your vision to life. We handle bespoke designs, planning applications, and construction documents with a 100% approval success rate. Let us navigate the complexities while you dream big.
Structural Engineering
Safety meets innovation. Our structural engineers work hand-in-hand with architects to ensure every beam, wall, and foundation exceeds building regulations. Every CBS project receives full Building Control sign-off, guaranteed.
Foundations & Groundworks
Every great build starts from the ground up. Whether it is trench fill, raft, or piled foundations, we tailor solutions to your soil conditions and design requirements. Our drainage expertise includes build-over agreements with Anglian Water.
Brickwork & Steelwork
Precision craftsmanship in every course. Our skilled bricklayers seamlessly match existing walls while our steel installations range from simple RSJs to complex multi-beam configurations. Passers-by often stop to admire our work.
Roofing Solutions
Pitched, flat, or something unique - we have completed hundreds of roof projects. From Velux skylights to stunning glass lanterns up to 2.5m, we bring natural light flooding into your new space while keeping the elements out.
Complete Finishing
The details that make a house a home. Electrics, plumbing, underfloor heating, plastering, flooring, kitchens, bathrooms - we handle every finishing touch to the highest standards. Come see our work for yourself.
Why Choose Crownhill Building Services?
Fully Insured
Public liability insurance up to £2 million for your complete peace of mind
Experienced Team
The same trusted team of professionals working together since 2006
Fixed Price Quotes
The price we quote is the price you pay — no hidden extras or surprises
12 Month Warranty
All our work comes with a comprehensive parts and labour guarantee
Ready to Discuss Your Project?
Contact us today for a free, no-obligation consultation. We'll visit your property, discuss your requirements, and provide a detailed quote.