14/11/2017 Air Tightness

We endeavour to design and detail buildings with a high level of airtightness. Having an airtight house means that its thermal performance is much more efficient with the warm air being unable to escape through the building fabric. It’s still very important to consider the airtightness of a building even if it has been very well insulated; the warm air will inevitably find it’s way out and you’ll have to pump the building with more heat to keep the ambient temperature stable.

We’re reaching the end of a barn conversion build at the moment and it was recently pressure tested to assess the level of air changes, or in laymans terms, how much air is leaking out of the building. The level achieved was an incredible 0.9 air changes/hour@n50, which surpasses not only the Building Regs target of 10 air changes/hour but also the Passivhaus retrofit target of 1.0 air changes/hour@n50.

This is an amazing result for a leaky old stone barn and has been achieved through careful and considered technical airtightness detailing, with diligent workmanship and attention to detail on site.

  • 23/01/2023Concept Interiors Sketches play an important role in our early design process. They provide loose options for a client and have an informal feel that helps to form the direction of the design. These sketches are for an exciting project we’re working
  • 09/01/2023Winter Visit A team visit to a local site to check progress on building works. The project is nearing completion so we look forward to a full reveal in a few months. This timber framed extension has an overhanging copper roof and
  • 25/12/2022Merry Christmas! From all of us at CLD.
  • 05/12/2022New completed project Another recently completed project has been photographed and is now live on the website. Read more here about our approach and the integration of landscape and architectural designs.
  • 18/11/2022Grade II Listed Cottage A 3D model for a single storey kitchen link extension to connect a Grade II Listed cottage and an outbuilding. We will work up a few options like these as part of the initial design process before settling on an
  • 04/11/2022New completed project One of a few of our completed projects that we’ve had photographed recently. Situated on the edge of an ancient woodland  in Oxfordshire. Click this link to read more.
  • 21/10/2022New additions to the website! We’ve been working with our photographer over the summer and are proud to publish some new projects on the website! Watch this space as we reveal some of our latest designs, and click this link to read more about one of
  • 01/10/2022“… a Pruesplosion” Our Gloucestershire Farmhouse project was featured in the FT How To Spend It magazine this Saturday 1st October! Click this link to read the article online, and this link to read more about our design concept and approach. Photography: Fred Howarth
  • 05/09/2022Concept Sketches Concept sketches are developed early on in the design process to quickly generate, test and present ideas to the client. They will be included in a ‘Book 1’ feasibility study which we undertake at the start of every project. We
  • 10/08/2022Planning granted for Wiltshire house We have recently received planning permission for this house extension in Wiltshire. The existing Edwardian house had been subjected to a series of piecemeal additions which required updating to improve the living spaces and the energy efficiency of the house.
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