Changes to Permitted Development – Changes to Householder Permitted Development Rights 
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Annex 1 
Householder Permitted Development Rights 
Existing Tolerance Proposed Tolerance 
Class 1A.1(a); Class 1B.1(d); Class 1E.1(c) [in 
conjunction with 1A.3(a)] 
Cumulative volume limitation on extensions/roof 
extensions/outbuildings larger than 10 cu m within 
5m of the house: 
70 cu m/15% for detached/semi-detached; 
50 cu m/10% for terraced; 
Maximum 115 cu m for all house types 
Depth limitation on rear extensions: 
Single storey: 4m (attached), 5m (detached); 
Two storey: 3m (attached), 4m (detached) 
Width limitation on side extensions: 
50% of width of original dwellinghouse 
Limitations for 2 storey or higher rear extensions: 
Minimum 7m to rear boundary; 
Roof pitch to match main house; 
Any side-facing windows to be obscure glazed and 
non-opening 
Other limitations: 
No terraces or balconies; 
Materials to match 
Class 1A.1(a); Class 1B.1(d), Class 1E.1(f) 
Cumulative volume limitation on extensions/ 
outbuildings larger than 10 cu m on Article 1(5)* 
land: 
Maximum 50 cu m/10% for all house types; 
Maximum 115 cu m for all house types; 
No roof extensions; 
Maximum 10 cu m for each outbuilding 
In National Parks/AONB’s/World Heritage Sites: 
Maximum floor area of outbuildings/swimming pools 
more than 20m from the house: 10 sq m 
In designated areas: 
No extensions or outbuildings to the side of 
dwellinghouses; 
No roof extensions 
Within the curtilage of listed buildings: 
Maximum floor area of outbuildings: 3 sq m 
Class 1A.2 
Various forms of cladding prevented on 
Article 1(5)* land 
All forms of cladding prevented in designated areas 
Class 1B.1(c) 
Volume limitation on roof extensions: 
50 cu m for detached/semi-detached; 
40 cu m for terraced 
Size limitation on roof extensions: 
Minimum 1m from eaves, ridge, verge (and 
party wall) 
Other limitations: 
No front or side roof extensions; 
No terraces or balconies; 
Materials to match; 
Any side-facing windows to be obscure-glazed and 
non-opening 
Class 1A.1(d) 
Limitation on height of extensions near boundaries: 
Maximum 4m high within 2m of a boundary 
Height limitation on extensions: 
3m to eaves within 2m of a boundary; 
4m to ridge within 2m of a boundary; 
4m for side extensions; 
Within 2m of a boundary or to the side of a 
dwellinghouse extensions to be single storey only 
Class 1A.1(b); Class 1B.1(a) 
Extensions/roof extensions to be no higher than 
existing house 
Eaves and ridge height of extensions to be no higher 
than the eaves and ridge of the main part of the 
dwellinghouse 
* Article 1(5) land includes sensitive areas such as National Parks, Areas of Outstanding Natural Beauty, Conservations Areas 
and areas of ecological importance

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Existing Tolerance Proposed Tolerance 
Class 1A.1(e); Class 1E.1 (e) 
Maximum 50% ground coverage of extensions/ 
outbuildings (excluding the area of the original 
house) 
Extensions and outbuildings to cover a maximum of 
50% of private garden area 
Class 1A.1(c); Class 1B.1(g); Class 1E.1(g); 
Class 1G.1(c) 
Extensions/roof extensions/outbuildings/oil storage 
containers to be no nearer a highway than the 
original house 
Extensions/roof extensions/outbuildings not to come 
forward of the principal elevation or side elevations 
facing a highway 
Class 1E.1(d); Class 1G.1(g) 
Limitation on height of outbuildings/oil storage 
containers: 
4m for outbuildings with a ridged roof; 
3m for outbuildings with a flat roof and oil storage 
containers 
Height limitation on outbuildings: 
2.5m to eaves, 4m to ridge (dual pitched), 3m 
(monopitched) 
2.5m to ridge within 2m of a boundary 
Floor area limitation: 
20 sq m if the rear garden is less than 100 sq m; 
30 sq m if the rear garden exceeds 100 sq m 
Other limitations: 
Single storey only; 
No terraces or balconies; 
Class 1C.1 
Roof alterations not to materially alter roofshape 
Limitations on roof alterations (Entec study): 
Maximum upstand of 150mm (120mm in sensitive 
areas); 
Maximum 60% roof coverage (50% in sensitive 
areas) 
Class 1D.1(a); Class 1D.1(b); Class 1D.1(c) 
Restrictions on porch size: 
3sq m in area; 
3m high; 
Minimum 2m back from a highway 
No change 
Class F 
Hard surfaces unrestricted provided incidental to the 
enjoyment of the dwellinghouse 
No change 
Class 2A.1(a); Class 2A.1(b) 
Limitations on height of means of enclosure: 1m 
facing a highway 
2m elsewhere 
No change 
Class 2B 
Creation of means of access unrestricted except onto 
trunk or classified roads 
No change; delete requirement that accesses must 
be required in connection with another class of 
development 
Class 2C.1 
Painting exterior allowed provided it is not for the 
purpose of advertising 
No change 
Annex 1