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House Extension Architect

When done correctly a house extension will not only transform the enjoyment of your property but importantly add value. Architects are best placed to help homeowners from beginning to end. At Aterlierdb we help Clients through all stages of the project acting as a Lead Consultant. We recommend other consultants for the team to ensure that all are acting in your interest such as a Structural Engineer, Party Wall Surveyors and more. Using this traditional form of procurement, retaining Consultants on the ‘client side’, is the only way to control that the Build quality is as required. ‘Design + Build’ companies provide a turnkey solution where all eggs are in the same basket – something impossible to truly appraise or control.

Types of House Extensions

The main types of house extensions that can be added are:

  • Rear ground floor extension
  • Side return ground floor extension
  • Wrap around ground floor extension
  • Rear two storey extension
  • Basement with or without front and/or rear lightwells
  • Single or double storey side extension
  • Loft extension

Some of the above are quite straightforward in terms of securing Planning Permission and/or Permitted Development (a Certificate of Lawfulness). Some are of course more site dependent especially when considering two storey side extensions. An experienced Architect can review your property and provide a high level desk top assessment of what should be viable at the property.

An Architect will provide designs to your brief but also advise on how best to stitch new to old in a sensitive design approach that will be met favourably with the Planning department and address Planning Policy.

Interior House Re-planning

When adding extensions to a property it is necessary to consider the impact of the new space on the existing. This critical factor is important to budget for as the whole house accommodation offer usually needs to be re-considered when transforming each floor level.

Typically period houses suffer from a lack of storage, no cloak rooms, no dedicated utility area and more. When designing additions to a house, Architects should also show what could be undertaken in adjoining areas to further improve the full impact of the added space.

Adding side return infills creates design opportunities to significantly change the operability of the ground floor plan and create new spaces that can offer a better servant/served balance.

Extensions and Neighbours

Good neighbourliness should be encouraged at an early stage. On learning an extension project is being considered, an adjoining owner can become understandably concerned. The Party Wall process is in place to address and protect all parties impacted by such a project. It can be the case that clients have to cover costs for a number of adjoining owners Party Wall Surveyors – something to best appraise at the outset of a project when budgetting. Atelierdb are highly experienced in the Party Wall Act and advise clients throughout the Design stages.

Call us on 0203 142 7672 or complete the form below

We are here to help

    We used Atelierdb to design and project manage our kitchen extension. We found David extremely professional and with great attention to detail. The design process was tailored and iterative to ensure we met our objectives wherever possible, and the project management service was invaluable to keep us on track (and sane!) during the building works. We are now delighted with the new living space that it has achieved for us.

    — Zoe Lelliott


    It has been an absolute pleasure working with Atelierdb from the initial planning and design of the project right through to completion. Not only did they deliver on the brief, they managed to exceed our expectations on what could be done to the space (whilst staying within budget!). The entire process remained stress-free thanks to the ongoing communication between Atelierdb and the building contractor, allowing the project to be completed on time and to a very high standard. Highly recommended.

    — Danny and Lara Moody


    We appointed Atelierdb to re-design our house prior to a full renovation. We were extremely pleased with the service, David and his team provided many layout possibilities, they were flexible and professional throughout and always had solutions. I would highly recommend them.

    — Jennifer Pitt

    Heaver Estate Conservation Area

    We're very happy with the basement living space which was created as part of a larger renovation of the property. atelierdb helped us focus on the relevant issues at the relevant time and were particularly diligent in administering the building contract.

    — Stewart Quinn

    Northcote Road Battersea

    We have recently completed our kitchen extension project and I can only recommend David and his team. The support and patience during the design phase was great and the project management and support during the construction has been really helpful. They turned an idea into an amazing living space.

    — Michela Bariletti


    We have since moved into a larger property and project and we are now working with atelierdb for the second time.

    — Carol O'Gorman