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.

  • Planning Permission Received - We have received planning permission for the refurbishment and conversion of a stone barn in a conservation area in to a high quality, sustainable home. The aim of the project is to sensitively adapt and re-use the now redundant agricultural
  • Charlie co-hosting Sustainability podcast - Charlie has been co-hosting a podcast! Each month in Sustainability Solved, he and co-host Will Richardson meet with inspirational people at the forefront of the sustainability movement, those who are making innovative changes within their organisations to tackle the climate
  • Bear’s Reach shortlisted for RIBA South Award - A recently completed project has been shortlisted for a RIBA South Award 2024! It it one of a few we’ve worked on at the Graven Hill self build development. We worked closely with local builders and specialists to deliver a
  • Project on Site - Photo’s from a project on site which were extensively refurbishing including a full thermal upgrade. This will involve internally insulating, replacing the existing windows with triple glazed windows and installing a renewable energy source. Here we’re stripping it back to
  • Planning Permission Granted - Planning permission has been granted for an extension and remodelling for a nineteenth century cottage in Oxfordshire. The building stands in a secluded spot within the conservation area of the village but situated away from any listed buildings. Its position
  • Completed Project - We have recently completed a multi-phased project to refurbish a grade II listed farmhouse and outbuilding in a conservation area. The project included extending the farmhouse and converting an existing outbuilding to restore the original farmyard character of the site.
  • Community Housing Project in Hook Norton - The vast majority of new housing is unsustainable, unfit for purpose, and doesn’t answer the local need. Possibly one of the biggest issues that results in the poor quality of housing in this country is the discrepancy between the local
  • Team outing to the Cotswold Distillery - Happy New Year! Before Christmas the Charlie Luxton Design team visited the Cotswold Distillery. Just a stones throw from our studio, the distillery has been making award winning gin for the past 9 years. This was a natural choice while
  • Competition winner - Blackwood has won two awards in The Daily Telegraph Homebuilding & Renovating Awards. Best Self-Build and the coveted Home of the Year! We are thrilled with the result and the project features on the cover of January’s edition of Homebuilding
  • Oxfordshire farmhouse nearing completion - Careful design and attention to detail is breathing new life in to a collection of neglected farmhouse buildings in south Oxfordshire. We are restoring original brick barns and reorienting the main farmhouse to take full advantage of a fabulous view,
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