Assured Builders London

We have been in the building trade for 25 years, we are a professional building company specialising in New Builds, Extensions and Loft conversions & renovations in London & Hertfordshire. The majority of our work is through personal recommendations. We are always happy to show previous work. We are also Members of the Federation of Master Builders, the LABC and trust Mark.


  1. Extensions
  2. Loft Conversions
  3. Conversions - General
  4. Restoration & Refurbishment
  5. Groundwork & Foundations

About Assured Builders London

We consult with Architects, Surveyors, Quantity Surveyors, M&E Engineers and the council on your behalf so the project runs as smoothly and stress free as possible.
You give us your brief alongside your drawings and that’s it, leave it to us we take control of everything from there.
New builds
Loft Conversions
House conversions into flats
House renovations
Bespoke garden rooms
All roofing works
All landscaping

We can also supply you with the following contacts, and help you through the process of the up and coming works,(if needed).

Structural Engineers
Party wall advice
Private building control


We have over 30 years of experience in the building trade. We are a family run business and accredited FMB member, we have finished many projects with high standards of work and guaranteed quality. Our Clients are very happy to recommend us.
We have completed projects from New builds and Extensions, Loft Conversions to refurbishment and renovations.

Most of our work comes from recommendations
All teams are fully qualified and skilled trades, within house and not sub contractors.

Federation Of Master Builders


Public Liability Insurance

Limit of indemnity: £10,000,000.00
Valid until: 2nd Jan 2024

Latest reviews

  • Home renovation

    We have instructed Assured Builders to carry out out our renovation work. Work has just started and the foundations have just been laid down. I am so please to have found Assured Builders. Nikki and Lee are a pleasure to work with. Any questions or concerns are quickly addressed and any suggestions are quickly looked into. Both Nikki and Lee are very friendly and easy to talk to which was very important to us. I cannot wait for the work to be completed. I will update my review once the job is done and post photos.
    We have been communicating/working with Assured Builders for a few months now and I can only say I have nothing but good things to say. I can highly recommend Assured Builders.

  • Rear extension and loft conversion

    I will rate Lee and his team 9.5/10. In summary, highly recommended to anyone (as a matter of fact he has already done another job down the street).
    Lee is very fast in delivering the project. All other builders told me my project needs 6 months to complete but Lee managed to complete it within 3 months so we managed to move in before winter and my son enjoys his Christmas in the new house.
    Lee is also a very knowledgeable person, we have encountered some structural problems which my architects missed. Lee addressed them and my structural engineer told me that Lee's calculation was the same as his.
    Nikki has also been helpful during the project in sorting out some of my additional requests. Overall, very lovely persons to work with.
    I deducted 0.5 points because some of his sub-contractors' work quality needs improve. I held my feedback for 6 months to see whether there are any problems not identified at completion. There were some bits and pieces I needed to sort out myself on joineries, shower rooms, sockets and kitchen fitting etc. This altogether resulted roughly a day worth of DIY and around £500 additional cost as I don't really bother getting the subbies back cause this could take ages. Having said that, these additional effort and cost is peppercorn compared to the entire project, and I guess no one can complete a job to perfection. So overall, very happy and highly recommended.

  • Ground floor rear and side extension

    We worked with Assured Builders London on the renovation and extension of a ground floor flat in North London. Lee, Nikki and their team are extremely friendly, very experienced, honest and hardworking. The project was completed on time and within budget. Nikki was very helpful throughout the process dealing with the administrative side of things, while Lee was on site daily building and supervising his crew. They were quick to respond, easy to communicate with and their prices are competitive. We are pleased to say that since then we have worked with them again on a another building project.