NHBC Position Statement on: ‘Guidance on evaluation of development proposals on sites where methane and carbon dioxide are present’

April 2024

In conjunction with our partners, RSK Group Plc, NHBC here confirms our intent to withdraw support and recognition of the joint publication referred to above. This will not be an immediate enactment and will be subject to a transitional arrangement that will expire as of 1st July 2025. 

Until this time, applications in terms of site assessments and relating to suitability of products that refer to this publication will still be considered by NHBC. 

From 1st July 2025, they will not, and references should be to more recent standards and guidance that are/will be available and consider the design and detailing of measures that present reasonable mitigation of the potential risk(s). 

NHBC has already provided support to industry in this regard through the NHBC Foundation NF94 publication ‘Hazardous ground gas – an essential guide for housebuilders’, released May 2023, to which readers are initially referred and that is accessible for download.

In support of the above, NHBC will also be embarking on a technical review of its NHBC Standards Chapter 4.1 – Land quality – managing ground conditions for a future standards release.  When and where relevant, updates to or consultations with industry and stakeholders will take place as a vital part of this work.

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Any technical information contained on this website is produced by NHBC as guidance solely for all our builder customers as to how to interpret the technical requirements in relation to the warranty cover provided by NHBC under its Buildmark, Buildmark Choice, Buildmark Link, Buildmark Solo, Buildmark Connect or any similar product from time to time. It has not been created or intended for distribution or use outside of that purpose. The technical information contained on this web page does not constitute advice and is not to be relied upon by any third party. Nothing on this web page is intended to, nor should it be taken to, create any legal or contractual relationship. Any third party who chooses to rely upon the information contained on this web page shall do so entirely at their own risk and NHBC accepts no duty of care or liability, however caused, in connection with its use or reliance by any third party.