Do I Need Planning Permission For Triple Glazing?

If you are considering triple glazing, you may be wondering whether you need to obtain planning permission. The good news is that many regulations have been relaxed somewhat over the years. However, there are still a number of areas that still relate triple glazing that you may need to obtain planning permission for before works can go ahead. Your triple glazing company should be well versed with the latest planning regulations and will be able to provide you with professional advice.

New Builds And Major Changes


If your property is a new build or requires major renovations to the existing structure, you may be required to obtain planning permission. It’s important to note that planning permission is not the same as Building Regulations approval. Building Regulations set standards in health and safety and we cover this in a separate article. Our blog also covers what you’ll need to consider if you live in a conservation area and wish to install triple glazing.

Before starting any home improvements, most homeowners will need to obtain planning permission, or at least check whether approval is required. Planning permission rules differ from region to region and oversee how a city or town is developed. Your local authority will usually have information on their website relating to the area and what is permitted.

Planning Permission For Triple Glazing

Unless you live in a listed building or conservation area, it is unlikely that you will need planning permission for the installation of triple glazing. If the installation is part of a major renovation, it will usually be taken into account as part of the entire project.

If your property is situated within a conservation area, you may need to prove to the local planning authority that the windows and doors you install will remain in keeping with other windows and doors in the area. Your triple glazing company should be able to provide advice if this is the case, and handle planning permission applications on your behalf.

As a general rule, you won’t need planning permission for:

  • Any maintenance or minor improvements such as painting your door or window frames.
  • A new bay window. However, depending on dimensions and build, a bay window may be regarded as an extension and will need planning permission.
  • Replacement windows and doors that are similar in style to those that were used during the construction of the property.

You must also ensure that new windows that are situated on a side elevation on the upper floor are glazed with obscure glass and either more than 1.7 metres above ground level or be non-opening.

Can I Install Triple Glazing In A Listed Building?


Listed buildings are often subject to more planning regulations than more modern properties. Listed building status is usually applied to any building that was constructed before 1700. A vast number of buildings built between 1700 and 1840 also have listed building status. You can find out whether your building is listed by checking the National Heritage List for England (NHLE).

You will need to obtain Listed Building Consent if you wish to carry out alterations that may affect the character of the building. Again, your glazing company will be able to help you with the finer details. All listed buildings are protected by law, and it is a criminal offence to carry out any works without this approval.

Making A Planning Permission Application

If you need to make a planning permission application, the process is usually quite simple. You will need to submit your application to your local authority. They will review your application and either approve or refuse it. If your application is refused, the local authority will give you a clear reason why this was the case along with any planning legislation that applies.

All listed building and planning applications for replacement windows and doors should include detailed drawings of elevations and cross sections for both the new and original windows. This will help the planning officer to compare the two types of windows. Your application could be delayed or refused if you fail to supply adequate or requested information in a timely manner, so it is a good idea to get as much documentation prepared as possible when you send in your application.

Installing Triple Glazing In Flats - Is Planning Permission Required?

You will normally need to obtain planning permission if you want to install triple glazing in a flat that is not the same as the existing fittings. This is because communal properties do not have permitted development rights when it comes to replacement windows. If the method of opening, design, profile or materials of the proposed replacement windows is different from existing windows, you should seek advice from your local authority. If the flat is within a listed building, you may also be required to obtain Listed Building Consent.

Other Considerations When Installing New Triple Glazing

If you are installing new windows and doors, they will usually need to comply with Building Regulations standards. Thermal insulation plays a big part in these regulations and new windows will need to feature energy efficient glazing as standard. An exemption to this rule is listed buildings and other heritage assets.

For further information on planning permission for windows and doors in the UK, you can check The Planning Portal, a website dedicated to the planning process, and which brings together information from local authorities and professionals across the industry.

Good News For The Majority Of UK Homeowners


The good news for most homeowners in the UK is that triple glazing installations, unless part of a major renovation project, will not require planning permission. When choosing a triple glazing company it is important to seek their advice if you feel the installation of your windows and doors may require planning approval. Most triple glazing companies will have thorough knowledge of the latest rules and regulations and provide you with advice for your individual project. After all, their reputation is at stake, and it would be a waste of their time to install your triple glazing only to find it has to be removed.

Published on : 2nd November 2016

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