PART M · Access and use
Does a house extension need wheelchair access
An ordinary extension to an existing house does not automatically have to meet the wheelchair user category for new dwellings. Part M's dwelling guidance expressly distinguishes extensions from the new-dwelling provisions. That distinction should be checked against the actual work proposed.
Why does the type of work matter
Extending a house, creating a new dwelling and materially altering existing arrangements are not identical situations. A project described casually as an extension may include other work that needs its own assessment.
Ask the designer to identify the applicable requirements and any planning conditions. Do not assume a neighbour's project had the same regulatory basis.
Can existing accessibility be made worse
The relevant rules for alterations and the existing building need checking. The absence of an automatic new-home category requirement is not a general permission to disregard access.
For example, relocating an entrance or changing the route to an existing facility may raise issues beyond the dimensions of the new room.
Should accessibility still influence the design
Yes. Wider circulation, manageable thresholds and a practical ground-floor layout can be useful even where a particular category is not mandatory. These are design choices to discuss alongside the legal requirements.
Consider current users and future needs before fixing door positions. A modest change during design may be easier than adapting completed construction later.
What about a shop extension
Non-domestic buildings have a different Part M framework. An answer about an ordinary house should not be used to dismiss access requirements for a workplace or public building.
What should you obtain
Get a clear statement of the applicable requirements, drawings showing usable dimensions and an explanation of any constraints.
Separate mandatory provisions from voluntary improvements in the quotation. That makes the scope understandable while allowing sensible accessibility features to be retained where they add value.