21st Century Design & Build Ltd
Extension Specialists. 21st Century Design & Build Ltd has been vetted and approved by TrustATrader. Covering Throughout London
Membership number TT28757
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Register GuaranteeAbout 21st Century Design & Build Ltd, London
In an unstable market house extensions are often the most viable option, helping you to get the most out of the space you have without the additional cost and stress of moving. Within most properties there is untapped potential just waiting to be discovered. The right home extension specialists will help you to do just that.
21st Century Design & Build Ltd have been providing high standard house and bungalow extensions for customers throughout London and the surrounding area for over 15 years.
We know that every person has a different vision for their home and sometimes they are not quite sure what they want. All they know is that they want their home extension to bring them something different. Our team are skilled in bungalow and house extensions. We will be happy to consult with you to get a good idea of your needs and desired outcomes as well as practicalities such as use of space and budget, before providing you with a free quote.
For 21st Century Design & Build Ltd there is no job too big or small. We undertake all elements of home extension works including:
- House Extensions
- Bungalow Extensions
- Loft Conversions
- Garage Conversions
- New Builds
- Roofs
- Kitchen Fitting
- Bathroom Fitting
- Windows & Conservatories
- Decorating & Renovations
- Carpentry & Joinery
- Plastering & Finishing
- Surveying & Planning
- Plumbing & Heating
- Drawings & Plans
- Building regulations
- General Building Work
If you would like to know more about the work we do or would like a free quote please feel free to contact us; our team of advisors will be happy to help you.
Please mention Trustatrader when calling.
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21st Century Design & Build Ltd
- Identification checked
- Company address verified
- Customer references checked
- Agreed to TrustATrader's high standards
- Agreed to complaints procedure
Insurance details
| Provider | QBE |
|---|---|
| Verified | 8th January 2025 |
Qualifications
- Logic Certification for Working Practices in Energy and Utilities
Associations
Reviews (21)
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Average rating: 5.0 out of 5
Review by Mike
on 2nd October 2025
Mike - Image 1 "Thomas and his team renovated the whole of my property. Kitchen, bathroom, bedrooms, living room and hallway. They have done a fantastic job. From start to finish Thomas has been highly professional. From giving advice, keeping me up to date with progress reports, and delivering a top class job. I could not recommend more highly."
- Initial impression Initial impression: 5 out of 5.0
- Punctuality Punctuality: 5 out of 5.0
- Cleanliness Cleanliness: 5 out of 5.0
- Quality Quality: 5 out of 5.0
- Value Value: 5 out of 5.0
- Overall opinion Overall opinion: 5 out of 5.0
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Average rating: 5.0 out of 5
Review by Jessica
on 31st August 2025
"We had a new kitchen fitted and we were so happy with everything. Tom was great at letting us know what was happening and solving any issues that came up. Everyone was very professional and the kitchen looks amazing."
- Initial impression Initial impression: 5 out of 5.0
- Punctuality Punctuality: 5 out of 5.0
- Cleanliness Cleanliness: 5 out of 5.0
- Quality Quality: 5 out of 5.0
- Value Value: 5 out of 5.0
- Overall opinion Overall opinion: 5 out of 5.0
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Average rating: 5.0 out of 5
Review by Serena
on 8th July 2025
"Communication with Tom was brilliant from the moment I first contacted him and explained the job, he was always quick to reply and easy to get hold off. We needed to get the job done quickly and he managed to squeeze it in. His team were professional, punctual and did a great job. Highly recommend."
- Initial impression Initial impression: 5 out of 5.0
- Punctuality Punctuality: 5 out of 5.0
- Cleanliness Cleanliness: 5 out of 5.0
- Quality Quality: 5 out of 5.0
- Value Value: 5 out of 5.0
- Overall opinion Overall opinion: 5 out of 5.0
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Average rating: 5.0 out of 5
Review by Alessia
on 2nd June 2025
"I am a returning client. The team is polite, punctual grating liaising with other contractors. What distinguishes from anyone else in my opinion, are the finishes. Impeccable."
- Initial impression Initial impression: 5 out of 5.0
- Punctuality Punctuality: 5 out of 5.0
- Cleanliness Cleanliness: 5 out of 5.0
- Quality Quality: 5 out of 5.0
- Value Value: 5 out of 5.0
- Overall opinion Overall opinion: 5 out of 5.0