Basement extensions London are becoming more common as the capital becomes short of space and as we all need the space to improve the quality our work and life balance. Extending up and out is sometimes not enough in a growing family’s home and a property developer can find a healthy return from increasing the size of the property – perhaps as renting a basement extension in London out for office space or a residential letting.

Basement Extension London Architects

The complexities of a basement extension London and particularly the management of dampness mean it can be labour intensive, so we recommend hiring the right people and that basement conversion cost is kept under control; please see our fees here. To learn how AURA won an award from Build in 2019 as the ‘Most Trusted Architecture Practice Greater London’, and why our online reviews are 4.9/5 on Google and 5/5 on Houzz please follow the links.

Is my Basement Extension Financially Viable?


As mentioned above, basement extensions and renovations are a good way to increase the value, and you do not have to be a property developer to want to see a return on your investment! But how much value will it add?

It is difficult to calculate and will depend on a multitude of different factors such as your area, quality of finish, and need for more space.

In very sort-after areas of London such as Kensington, Chelsea, Richmond or Hammersmith and Fulham where we have completed several projects, space is becoming harder to come by. This means that every square foot on the floor plan will add extra value. As most of these homes cannot build up and out, basement extensions are a great idea.

Examples of the types of rooms used in basement conversions would be:

  • Home Office
  • Cinema Room
  • Gym
  • Reception Rooms
  • Bedrooms,
  • Swimming Pool or Sauna
  • Utility Room
  • Wine Cellars


Doing your research on other homes along your street and in your postcode will give you a good idea of home much value it could add.

Calculating the cost for a basement extension can be slightly more challenging to work out than for example a loft conversion. By speaking to a trusted architect like AURA, you can tell them your budget, requirements, and how you want to use the space, they will then be able to provide an anticipated cost based on previous experience.

Contact us for a friendly discussion about your needs.

Our basement conversion London blog article.  Basement Conversion

Basement Extension London Architects

Our Unique 10-Step Design Process


1 – A simple, 3 step online brief, we will then contact you to discuss everything about the basement extension in more detail

2 – A desktop research study then a meeting to discuss

3 – A choice of designs and layouts –  we usually provide 3 options to choose from

4 – Managing the planning application – we will act as an agent to help you through the process and liaise with the planning officers.

5 – Working with the right people – we have a good relationship with builders and engineers that will help you with your project.

6 – Maintaining standards and working with the building control department. Again, acting as an agent through the approval process of your plans

7 – Looking after the final touches – The specification of works will detail all the internal finishes, wall coverings, floor coverings, bespoke joinery, and electrical and heating layouts amongst other finishing touches.

8 – Help you find the right builder – We have a good relationship with many builders and will create a tender package for you. We recommend sending the package to 3 or 4 contractors to find you a competitive and comprehensive price.

9 – We also offer a site monitoring service which relieves the pressure off you to keep an eye on your builders. We usually monitor once a week (unless agreed otherwise).

10 – Enjoy your new basement extension London!

Get Started by Creating your Online Brief

This is a quick 3 Step process. What you would like to do with your home?

Start Here

Aura Homes - Architectural Design IconAura Homes - Architectural Design

7 Prescott Place, London

4.8 18 reviews

  • Avatar Jennifer VP ★★★★★ a year ago
    Overall great design and exceptional value for money. As a first time consumer of architectural services on what was a large project I can not emphasise enough the value add that we got from Ben, Sophie and the wider Aura team. The effort … More and detail put into the design and specification of works along with significant assistance in project management was commendable. As the project evolved it was crystal clear that we saved a significant amount of time and money as a result of having a comprehensive package and most importantly we got what we wanted on budget. Expectations were exceeded in terms of meeting deadlines. Accommodating design changes and assistance with the planning process was also first rate. I would highly recommend the team and look forward to working with them on the next project.
  • Avatar Harry Bucknell ★★★★★ a year ago
    Couldn't recommend Ben and his team more. We were in a really tricky position with our building project and Ben navigated us safely out of it. Superb guidance, great technical knowledge and what I really valued the most was the communication. … More Always got back to me promptly which makes a real difference when stress levels are high. Thanks Aura!
  • Avatar Louise Hancock ★★★★★ a year ago
    Aura Homes is a highly professional firm of architects that always have the clients best interests at hart. The quality of their plans and drawings is superb and their turn-around when making amendments well within expected timelines. … More For bespoke projects, their research and recommendations (both in terms of quality and costs) is superb.

Making Everything Transparent


We often hear from clients that speaking to architects is a daunting and confusing experience, making the process unnecessarily complicated and hard to grasp.

Our MD, Ben Richards, set out to solve this issue for homeowners or property developers wanting a friendly residential architect from day one; please take a minute to watch him on the introductory video about us to the left.

That is why we share our fees on our website, create Blogs and FAQ articles to share industry insights, and have created the  10 Step AURA Process which is explained via YouTube or can be downloaded for free to read anytime.

Loft Conversions North London

Get us around for a Home Design Consultation and we’ll discuss your budget and start planning what we can do with your loft extension.

Call us on:  0203 189 1619 or visit us at: AURA Architecture, 7 Prescott Place, London, SW4 6BS