10 Dec Guide to Steel Buildings and Planning Permission
Which Steel Buildings are Exempt from Planning Permission?
Some steel frame buildings are considered to be “permitted developments”, so planning permission is not necessary. These include:
- Steel garages
- Steel sheds
- Workshops
- Other ancillary garden buildings
- Agricultural buildings erected on farms of 5 hectares or more
However, they are subject to the following limits and criteria:
- The steel building must not be a permanent dwelling (although it can be a workspace)
- It cannot protrude beyond the front-most part of the original building
- Outbuildings and garages must be single storey with a maximum height of 2.5 metres (4 metres if it has a pitched roof)
- The building is not more than 50% of the total land area outside the house
- It must not have any verandas, balconies or raised platforms
- If you have already extended, you may not be able to extend further as the building is seen as a percentage of your existing floorspace
Need Help With Steel Frame Buildings?
Baker Steel Trading can not only give you advice on whether planning permission will be needed for your project, but we can also support you with all your steel fabrication needs. We can work with you to develop bespoke, cost-effective steel frame buildings as well as supply you with CE-marked, high-quality I beams, H beams, channels and other structural steel products.
We also offer our customers additional services to help with steel frame building requirements, such as our site survey and measure service, HIAB hire and delivery & installation services. If you would like a free estimate of your project, give one of our team a call today. We are still working and following the UK government guidelines closely so we are still able to assist you with any queries you may have.

