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What's the deal with building regulations and outbuildings?

2 min read
Oct '25 • by Heather

Quick summary

Building regulations usually apply to outbuildings over 15 square metres and up to 30 metres, especially if they include sleeping areas. Most garages need approval, and converting them later also requires compliance. Regulations ensure your build is safe and sound, covering aspects like structure, insulation, glazing, doors, roofs, walls, and electrical work.

It’s unlikely that in day to day conversation you’ll hear the phrase ‘building regulations’ or ‘outbuildings’ come up, not unless you hang around with city planners and architects. But both are important terms to know, if you’re looking at adding another structure to your property.

First things first, an outbuilding is classed as any of the following…

  • A garage or carport
  • Summerhouse or shed
  • Greenhouse
  • Animal dwellings, such as for birds or bees
  • Outdoor saunas

...and more!

Basically, any outside structure that’s permanent would be classed as an outbuilding. So what do they have to do with building regulations?

How much does an architect charge?