Do New Windows Need Building Regs Approval in the UK?

Short answer: yes, replacement windows are generally covered by building regulations, but in most cases you will not need to apply for anything yourself. The building regs for windows are usually handled by your installer through self-certification. Here is how that works and when you might need to do more.

We fit windows across York and North Yorkshire, so this explains the process the way it actually plays out on a normal home. It is general guidance, not legal advice, and rules change, so always confirm the current position for your own job.

Why windows fall under building regs

Since 2002, replacement windows and doors in England and Wales have had to meet building regulations, mainly around energy efficiency, safety glazing, ventilation and means of escape. The idea is that new windows should be reasonably energy efficient and safe, not just weatherproof.

The main things the regulations care about are:

• Thermal performance: the glazing has to meet a minimum energy standard.
• Safety glass: toughened or laminated glass in and near doors and low-level glazing.
• Ventilation: adequate airflow, often via trickle vents.
• Means of escape: at least one suitable opening window in certain habitable rooms.

How self-certification works

Here is the part that saves most homeowners the hassle. Rather than everyone applying to building control, installers can register with a competent person scheme, the best known being FENSA, and some through Certass. A registered installer can self-certify that the work meets the regulations.

When the job is done, you should receive a certificate confirming compliance, and the work is notified to your local authority on your behalf. That certificate matters, because you will likely be asked for it when you come to sell the house.

So in practice, if you use a registered installer:

• You do not apply for building regs approval yourself.
• The installer certifies and notifies the work.
• You get a certificate to keep with your home's paperwork.

If you are replacing failed or draughty windows, our uPVC windows page covers the styles we fit, all to current standards.

When you might need building control instead

Not every job goes through self-certification. You may need to involve your local authority building control directly if:

• Your installer is not registered with a competent person scheme.
• The work is part of a larger project, such as a new opening or an extension.
• You are creating a brand new window opening rather than replacing like for like.

In those cases, a building control application and inspection may be needed. If you are unsure, a quick call to your local authority clears it up.

Repairs and like-for-like glass

Straightforward repairs are treated differently. Replacing a broken sealed unit or a handle, for example, is generally maintenance rather than a notifiable replacement, so it usually does not need certifying. Our window and door repairs page covers the sort of work that falls into this bracket. If in doubt, ask your installer where the line sits for your job.

Conservation areas and listed buildings

If your home is listed or in a conservation area, there may be extra rules on the style, material and appearance of windows, on top of building regs. These can restrict what you are allowed to fit. Requirements vary by area and change over time, so check the current position with your local authority before ordering.

FAQs

Do I need building regs to replace my windows?

Replacement windows are covered by building regulations, but if you use an installer registered with a competent person scheme like FENSA, they self-certify the work for you. You do not usually apply yourself, but you should receive a compliance certificate.

What is a FENSA certificate and why does it matter?

It is a certificate confirming your replacement windows meet building regulations, issued by a registered installer. It matters because buyers and solicitors typically ask for it when you sell, as proof the work was done to standard.

Do window repairs need building regs approval?

Generally no. Straightforward repairs, such as replacing a broken sealed unit, handle or hinge, are treated as maintenance rather than a notifiable replacement, so they usually do not need certifying. Check with your installer if you are unsure.

Are the rules different in a conservation area?

Yes, there can be extra restrictions on window style, material and appearance in conservation areas and on listed buildings, in addition to building regs. Rules vary by area and change over time, so confirm the current requirements with your local authority first.

Thinking about replacing your windows? Download our latest brochure to see the range, or request a free quote and we will talk you through it.