Permitted development rights do not remove requirements for permissions or consents under other regimes such as the building regulations and the Party Wall Act. either the hard surface shall be made of porous materials, or provision shall be made to direct run-off water from the hard surface to a permeable or porous area or surface within the curtilage of the dwellinghouse b) as a result of the works, the total area of ground covered by buildings within the curtilage of the dwellinghouse (other than the original dwellinghouse) would exceed 50% of the total area of the curtilage (excluding the ground area of the original dwellinghouse) A wall forming a side elevation of a house will be any wall that cannot be identified as being a front wall or a rear wall. Houses will often have more than two side elevation walls.

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Class A covers the enlargement, improvement or alterations to a house such as rear or side extensions as well as general alterations such as new windows and doors. There is a neighbour consultation scheme for larger rear extensions under Class A, paragraph A.1(g).Where any part of a proposed extension to a house is within 2 metres of the boundary of its curtilage, then the maximum height of the eaves that is allowed for the proposal is 3 metres. Under paragraph (ja) if the proposed extension is within these limitations, but is being joined to a previous enlargement which exceeds these limitations, it will not be permitted development. For the purpose of measuring height, the eaves of a house are the point where the lowest point of a roof slope, or a flat roof, meets the outside wall. Curtilage: is land which forms part and parcel with the house. Usually it is the area of land within which the house sits, or to which it is attached, such as the garden, but for some houses, especially in the case of properties with large grounds, it may be a smaller area. ii) the distance between the house and the highway - in cases where that distance is substantial, it is unlikely that a building can be said to front the highway. The same may be true where there is a significant intervening area of land in different ownership or use between the boundary of the curtilage of the house concerned and the highway.

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Under paragraph (ja) if the proposed extension is being joined to a previous enlargement, it will not be permitted development if the size of the total enlargement (being the proposed enlargement together with any previous enlargement) exceeds these limitations. For example, if a proposed extension of 3 metres in height is added to an existing extension which exceeds 4 metres in height, or if the proposed extension creates a total enlargement which has a width greater than half the width of the original dwellinghouse, it would not be permitted development. Rear and side extensions ii) 2.5 metres in the case of a building, enclosure or container within 2 metres of the boundary of the curtilage of the dwellinghouse, or

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Permitted development rights allow householders to improve and extend their homes without the need to apply for planning permission where that would be out of proportion with the impact of works carried out. Larger single storey rear extensions are subject to a neighbour consultation scheme.

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The principal elevation could include more than one roof slope facing in the same direction. For example, where there are large bay windows on the front elevation, or where there is an ‘L’ shaped frontage. In such cases, all such roof slopes will form the principal elevation and the line for determining what constitutes ‘extends beyond the plane of any existing roof slope’ will follow these slopes (see guidance on Class A (e) for an illustration of this.b) any upper-floor window located in a wall or roof slope forming a side elevation of the dwellinghouse shall be: