Definitions and Interpretation . . for Beginners ! !
Balcony
This is a railed platform outside a window. A 'Juliette balcony' consisting of railings only and with no platform is a balustrade and not a balcony.
Domestic curtilage
This is the garden area immediately surrounding the dwellinghouse. It does not include any garden which is separated from the house by a back access road or track, or a paddock whether separate or attached.
Dual pitched roof
This is a roof which has two faces (a double pitch) meeting at a ridge. It does not include hipped, pyramid or octagonal roofs which have more than two faces.
Eaves
The eaves are the part of the roof that meets or overhangs the walls of a building at the lowest, overhanging part of a sloping roof.
The eaves of an extension should not exceed the eaves of the part of the house being extended where there are eaves of different heights on the property. If you have a building that has both one and two storeys and the extension is built from the single storey part then the eaves should be no higher than the single storey eaves.
Flat
Is a separate and self contained set of premises built or adapted for use as a dwelling and forming part of a building and is divided horizontally from some other part of the building.
Forward of a wall forming the principal elevation of the original dwellinghouse
The position of the outbuilding shown in red in the diagram below will need planning permission as it is sited forward of the principal elevation of the dwellinghouse.
Link extensions
A link extension between the main house and a detached garage or other outbuilding would result in the garage becoming part of the 'enlarged part of the dwelling' and therefore would be included in the 3 or 4 metre rule as its enlargement and so such a link extension would not be permitted development.
Original
relation to a building, i.e. a dwellinghouse, means as it existed on 1st July 1948 or if built after this date the building as first built.
Principal elevation
This will normally be the part of the house that fronts the highway and which usually contains the main entrance. In a minority of cases there will need to be a case by case assessment where a property does not conform to the usual layout. For most plots it should be possible to distinguish easily the principal elevation from a side elevation.
On some corner plots it may be that more than one elevation has the character of a principal elevation (perhaps where there is more than one entrance to the property) in which case both would be covered by any restriction on the principal elevation.
Purpose incidental to the enjoyment of the dwelling house
Includes the keeping of poultry, bees, pet animals, birds, or other livestock for the domestic needs or personal enjoyment of the occupants of the dwellinghouse. It does not include the provision of a new dwelling within the domestic curtilage.
Rear wall of the original dwellinghouse
In the case where the rear wall is stepped, (say where a property has a three storey main part and a two storey rear return and a single storey rear projection) then any extension should also be stepped as shown in the following diagram.
Resulting roof space
The roof space as enlarged, taking into account any previous enlargement to the original roof space whether permitted or not.
Ridge
The ridge is the apex (top peak) of a roof.
Highway
is defined by the Highways Act 1980 and is:
* A road carrying vehicular traffic
* A public footpath or bridleway
In the case of private roads or ways a highway includes a private road that gives a "right to pass and re-pass" to people who are not occupants of the dwellings.
Raised platform
Any platform, such as decking, with a height more than 300 millimetres above existing ground level.
Side elevation
Side elevations on L shaped houses. There are two side elevations which face the highway on a corner plot. If an extension is built within space formed by the L it will be considered to be a rear extension not a side extension. Only where an extension is coming off the side of the L only and not the rear will it be considered a side extension.
Single dwellinghouse
In the diagram above the red extension in this position would require planning permission as it is a side extension.
In the diagram above the red extension in this position is a rear extension and would not need planning permission.
A detached, semi detached or terraced house. An outbuilding or garage is not part of the dwellinghouse. A dwellinghouse does not include a building containing one or more flats.
Highest part of the roof
Is the height of the main ridge and does not include chimneys or other protrusions. The ridge is the apex (top peak) of a roof.
Similar materials
If an extension is built off a stone wall then the stone to be used for its construction should match in type, size coursing and colour as closely as possible. For example if a property is built of magnesium limestone then magnesium limestone will be required for the extension, the use of sandstone or gritstone will not be a similar material. If there is a mixture of materials on a dwelling then the extension should match the materials of the part of the house that is being extended.
Roof materials, should match in colour and texture. For example:
1. If the existing roof is covered in natural slate then natural slate should be used for an extension roof.
2. Concrete tiles should have the same colour and profile as those on an existing roof.
3. Pantiles should have the same colour and profile as those on the existing roof.
4. Roofing felt is only a similar material if it is already used on the part of the building to be extended, i.e. an extension onto an existing flat roof extension or where there are existing felted flat roof dormers.
5. It will be acceptable to use a flat tile for the sides and front of dormers where the existing roof has a profiled tile, but a profiled tile to match should be used for the dormer roof itself.
Materials of a different type such as felt, painted timber, upvc, and lead are not considered to be similar to slates or roof tiles.
Single Storey
If a room or rooms are proposed within the roof space of a single storey ground floor extension then it would no longer be classed as single storey.
Terraced house
A dwellinghouse situated in a row of three or more dwellinghouses used or designed as single dwellings, where:-
It shares a party wall, with or has a main wall adjoining the main wall of, the dwellinghouse on either side; or
If it is at the end of a row, it shares a party wall with or has a main wall of a dwellinghouse which fulfils the requirements of a) above.
Width of the Original Dwellinghouse
Where the width of the original dwellinghouse varies it is the widest dimension hat should be used. The width in the following diagram is the principal elevation which faces the highway.
Ridge Heights
The extension shown in the following diagram extends beyond the side wall of the original dwellinghouse and is greater than half the width of the original so will need planning permission.
The ridge height of an extension should not exceed the height of the ridge on the part of the house which is being extended where different storey heights exist.
Width and Depth
The width of a property will normally be the width of the principal elevation which will usually front the highway, as shown on the diagram below.
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