There are strict rules and conditions you must meet
With milder conditions arriving and homeowners keen to make the most of their outdoor spaces, some may be considering adding a conservatory to their property.
It’s frequently viewed as a simpler alternative to a full-scale extension for creating additional room. One key advantage is that it can often be completed without requiring planning permission. This is because conservatories typically qualify as permitted development.
Nevertheless, before commencing any building work, it’s crucial to understand what falls within and outside these regulations. Getting it wrong could lead to significant problems further down the line.
According to Planning Portal, a partnership between TerraQuest Solutions Limited and the Ministry of Housing, Communities and Local Government (MHCLG), adding a conservatory to a house falls under the same planning regulations as any other domestic extension.
These are, as previously mentioned, called permitted development rights. They enable property owners to extend their homes without submitting a planning application, provided the work stays within specified limits and conditions.
The portal explained: “If you want to exceed these, then it is likely that an application for householder planning permission will be required. If the work adds over 100 square metres of floor space, it may also be liable for a charge under the Community Infrastructure Levy. If you are unsure, you are advised to contact your Local Planning Authority for guidance before starting any work.”
For all extensions
Specialists noted that no more than half the land surrounding the “original house” can be taken up by extensions or additional structures. These must not rise higher than the uppermost point of the existing roof, nor exceed the height of the existing eaves.
Where the extension falls within two metres of the boundary, the eaves height cannot surpass three metres, it added. The extension must not project forward of the ‘principal elevation’ or, where it faces a highway, the ‘side elevation’.
The work must not incorporate verandas, balconies or raised platforms; a microwave antenna such as a TV aerial or satellite dish; a chimney, flue or soil and vent pipe or any alteration to the roof of the existing house.
For side extensions
The specialists further clarified that, where it would stretch beyond the ‘side elevation’ of the original house, the extension must not surpass four metres in height, can only be single storey and must be no wider than half the width of the original house.
For single-storey extensions
The specialists clarified that single-storey rear extensions cannot project beyond the rear wall of the original property by more than four metres for a detached house, or more than three metres for any other property.
They continued: “Where not on Article 2(3) designated land or a Site of Special Scientific Interest; and subject to ‘prior approval’, the limit for single-storey rear extensions is increased to eight metres if a detached house; or six metres for any other house. This requires that the relevant Local Planning Authority is informed of the proposed work via a prior approval application. Single-storey rear extensions cannot exceed four metres in height.”
For extensions of more than one storey
Planning Portal stated that extensions of more than one storey “must not extend beyond the rear wall of the original house by more than three metres or be within seven metres of any boundary opposite the rear wall of the house”. The roof pitch must correspond with the existing property as far as practicable – this also applies to any upper storey constructed on an existing extension.
Furthermore, any upper-floor window positioned in a ‘side elevation’ must be obscure-glazed and non-opening. All side extensions of more than one storey require householder planning permission.
There are conditions attached to all of this, including additional restrictions for properties within conservation areas, for instance. Planning Portal also stated that these regulations apply in the context of the planned extension and any earlier extensions. They are only applicable to houses.
The rules are a summary of Schedule 2, Part A, Class A of The Town and Country Planning (General Permitted Development) (England) Order 2015 and detailed advice provided by the Government can be found in the ‘Permitted development rights for householders: technical guidance’.
Anyone considering undertaking work should examine these regulations and documents carefully before proceeding with anything.
