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What is a Part L Door?

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Part L is the Building Regulations Document that covers the conservation of fuel and power. Part L is the document that specifies all the regulations for energy efficiency in new buildings, new dwellings, and buildings undergoing major renovations.

If you are looking to have a new front door fitted, you may hear mention of Part L doors. The term ‘Part L’ comes from the building regulations, which stipulate that every new home and all replacement windows and doors must comply with specific energy efficiency standards.

The main reason for everyone needing a Part L compliant front door is to stop the excessive loss of heat through the front door area. It’s been found that a large amount of heat is lost in this area, so there are specific requirements now in place to make sure this doesn’t happen.

Many different styles and materials are available, such as concrete, steel, and composite doors, but not every door meets the criteria laid down by Part L of the Building Regulations.

How do I know if I need a Part L Door in my home?

Part L compliance is mandatory for all new builds and extensions built after 2010, so whether it’s a back door, front door, patio door, or bi-fold door, you’ll need to make sure your choice is Part L compliant.

It’s a legal requirement that new builds and extensions meet set energy efficiency standards (Part L of the Building Regulations).

All doors installed as part of a new build or extension must be Part L compliant. This ensures your home is as energy efficient as possible and reduces your energy bills, helping keep fuel costs low.

You can rest assured that this will be achieved if you choose a Part L compliant product.

Doors Delivered is the main supplier of internal doors in the UK for both residential and commercial properties. We bring in a plethora of different designs at affordable prices. Browse our range of oak doors, white doors, internal glazed doors, walnut doors, pine doors and find the most suitable option for your interior.


What does part L compliant door mean?

Poor installation, poor quality materials, and not enough thickness are some of the main reasons wherefore heat energy can pass through a door without any issues at all. Part L in terms of regulations deals with such considerations.

Does part L apply to extensions?

Prior to the summer of 2022, part L did not apply for extensions. A new law was introduced in June 2022. It is a serious step up from the previous edition, which was last updated in 2013. This new regulation targets extensions as well.

How do you comply with part L?

To comply with part L, the DER should be lower or equal to the TER. On the same note, the DFEE must be lower or equal to the TFEE.

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