Planning · England · Free to use
Permitted development extension checker
Check a rear or side extension against the Class A limits, including the larger home extension route.
GPDO 2015, Schedule 2 Part 1 Class A, as amended
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Planning · Result
Prior approval needed
Larger home extension: notify the council and wait for the neighbour consultation (A.4).
Check needed- Depth beyond rear wall: Check neededmax 3 m, or 6 m with prior approval (A.1(f), (g))4.5 m
- Height: Checks passedmax 4 m3.6 m
- Height against existing roof: Checks passednot above the highest part (A.1(c))3.6 m
- Eaves against existing eaves: Checks passednot above existing eaves (A.1(d))2.8 m
- Eaves within 2 m of boundary: Checks passedmax 3 m (A.1(i))2.8 m
- Curtilage covered: Checks passedmax 50% (A.1(b))34%
- Materials must be similar in appearance to the existing house. No balconies, verandas or raised platforms (A.1(k)).
- On Article 2(3) land, no cladding of the exterior (A.2).
Clauses this relies on
Source edition and scope
GPDO 2015, Schedule 2 Part 1 Class A, as amended.
This is a preliminary check of the conditions shown. Confirm the edition, project circumstances and any additional requirements with your architect or building control.
A design aid, not legal advice. Checked against the Building Regulations 2010 for England; confirm with building control.