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It’s time to expect more from your builders.

As famously featured in

4 simple steps to develop your property

Free Property Valuation

 FREE Phone Consultation

If you request a call back or get in touch with us via our contact page, we offer a FREE phone consultation. Where you’ll speak with one of our helpful property experts, who’ll be able to advise you on the best course of action for all of your property building and development needs.

No-Obligation Quote

During the phone consultation an in-person meeting will be arranged, where one of our property managers will come out to you to discuss the work. After reviewing the property and the job at hand, they’ll be able to offer you an obligation-free quote and if you choose to accept it arrange the contract there and then.

Our Packages
List your property on the market

Achieving Milestones

Once the contract has been finalised you’ll be able to monitor the works progress and discuss all questions and queries you may have with your dedicated property manager. Watch as your milestones are achieved within the timeline that was set.


After the work is done, you’ll review the changes and ensure that it is to your satisfaction, only then will payment be collected. There is no payment required until all work has been completed and you, the customer are completely content with what has been accomplished.

Complete your property sale

Our Services


Home Extensions




Loft Conversions


House Conversions




New Builds






Other Services

Trusted by hundreds of happy customers

CastleSmart did our loft extension and I’m so happy with the way it came out. Would definitely work with them again!
Henry, Kensington
After requesting a callback, I surprisingly received a call on the same day. I went over the extension that I wanted done and they had someone out the next day to discuss it further.
Matt, Hammersmith
I would recommend CastleSmart to anyone looking to have building work done, they offered the cheapest quotes out of all companies I called and their work was done before scheduled!
Sandra, Camden
I was unsure about changing the builders that I had used previously, but had heard good things about CastleSmart, so I took the plunge and gave them a call. After speaking with one of their friendly representatives we arranged a meeting so that the work could be discussed further. At the end of the meeting, I braced myself for the quote expecting the worst but was ecstatic to find it was considerably lower than my previous builders.
Jags, Brentford