Converting a listed building or a building that falls within a conservation area can be tricky especially with regard to existing windows, external walls and roofs.

So what do you need to know in order for your conversion or refurbishment to be compliant?

When upgrading thermal elements it is accepted that historic buildings do not need to meet current building regulations if the conservation officer feels that this would have a detrimental impact to its historic status.

So what is required and when is it relevant?

1. Existing windows

Where existing single glazed windows are retained:

  • A copy of the listed building consent confirming that the windows cannot be replaced, must be supplied confirming specifically which windows are to be covered by the listing.
  • A full condition report confirming that the windows are capable of forming a waterproof barrier with a 15 years life expectancy. The report should be completed by either a RICS surveyor or industry specialist who has proven experience in window repair and renovation.
  • If windows are to be repaired, a full repair schedule will be required.

2. External walls and roofs

Where other external elements exist:

  • A copy of the listed building consent confirming that the walls/roof cannot be upgraded.

A full condition report confirming that the walls/roof are performing satisfactorily to achieve a 60 years life expectancy for structural elements and 15 years where performing just the weather /water proof barrier. Again this should be completed by a RICS surveyor or equivalent industry specialist.

 By Frzana Ferguson

Please Note: Every care was taken to ensure the information in this article was correct at the time of publication. Any written guidance provided does not replace the reader’s professional judgement and any construction project should comply with the relevant Building Regulations or applicable technical standards. However, for the most up to date LABC Warranty technical guidance please refer to your Risk Management Surveyor and the latest version of the LABC Warranty technical manual.

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