Prior Approval Larger Home Extensions

5 Feb 2020
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United Kingdom
Looking at a new project where previous owners had built a conservatory to the rear of the property and is connected to a once detached garage. The property is semi-detached and we are looking to demolish the conservatory and re-build a 5.4m deep single storey extension. The maximum height and eaves height lend the project for a prior approval larger home extension Application rather than full planning.

However as the extension meets the once detached outbuilding is the proposal also a side extension and a much larger rear extension including the length of the garage which would put the project well over the 6m allowed? Would a householder planning application be the better way forward? Property is not listed nor is it within an AONB etc.

I've enclosed a couple of PDFs to help explain the query.

Any feedback on this would be greatly appreciated :)


  • SK01.pdf
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  • SK02.pdf
    101.6 KB · Views: 63
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I would say once it attaches to the garage the whole structure will be deemed the 'enlarged part of the dwellinghouse' and this would bring in the side elevation rule. Having said that I think there's sufficient greyness to give it a go. What's the other boundary like? Is a 5.4m extension likely to be approved under planning?

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