Loft Conversions, Dormer and Roof Lights

It is understandable that owners should look to the large roof spaces found in many early Garden City houses, to create additional living space. This solution will inevitably introduce the need for new window openings which should be treated with great care and which will require the consent of the Heritage Foundation.

Dormer windows should be modest in relation to the size of the roof, without dominating or upsetting the balance of any elevations. Their design should reflect the style and appearance of the house. Within the Conservation Areas any front elevation dormers will also need planning permission from North Hertfordshire District Council and will only be allowed if they do not have a detrimental effect on the character of the area. Care must be taken to avoid the significant overlooking of adjoining or nearby properties. The use of roof lights in unobtrusive situations may be acceptable, particularly if they are the flat, 'conservation' type.

Updated guidance on roof lights

The above guidance relating to roof lights , contained in the Design Guide, last published in 1999, has recently been reviewed, with updates set out below. Under the terms of your lease or the Scheme of Management, the consent of the Heritage Foundation will usually be required for roof lights, because they affect the external appearance of a property.

Generally roof lights are likely to be acceptable if they are situated in unobtrusive locations, provided that the number or area does not dominate the property and they are finished in a colour and design, such as ‘conservation' type roof lights, to minimise their visual impact. On Listed buildings, prominent roof slopes or in locations facing a highway, roof lights will be refused unless there are overriding reasons in support of an application.

You should always check with the District Council whether their consent is also required.