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New Part L Building Regulations – What does this mean for your rooflight installation?

What is “Part L”?

Part L is an English building regulation which sets parameters and standards for energy efficiency and performance for new and existing buildings.

Part L first came into force on 6 April 2014, but on 15 June 2022, an update of the regulation was implemented, stating that all new buildings completed from that date onwards had to produce at least 31% fewer carbon emissions than previously accepted.

For buildings that were still in the planning process on 15 June 2022, a 12-month grace period was permitted. This meant that if a building notice – or initial notice – had been applied for pre-15 June 2022, the project would be considered under the previous Part L regulations so long as the building work began before the end of the grace period – 15 June 2023.

What does this mean for me now?

From now on, anyone involved in developing buildings in England must comply with the new energy performance standards and carbon dioxide emission reduction targets for both new-build and existing projects. For new domestic buildings, that target is 30%, while new commercial buildings have a slightly lower target of 27%.

As well as hitting the reduction % targets for carbon dioxide emissions, under the new regulations:

  • Walls, windows, rooflights and doors must comply with the Part L regulations.
  • New homes will be assessed against Standard Assessment Procedure (SAP) 10, which replaces SAP 2012 and sets higher insulation requirements.
  • During each phase of a building project, professionals such as builders and developers will have to provide photographic evidence of how their project is adhering to standards.
  • Developers won’t be permitted to complete a project without a compliant SAP10 BREL report.
EOS Rooflight Installation Skylight replacement with insulated upstands

What does this mean for me in the future?

The uplift to Part L requirements is just one of many changes which will impact the building industry in the coming years.

The Future Homes Standard – which is expected to be implemented by 2025 – will set out even stricter energy efficiency standards for new residential buildings. It will sit alongside The Future Buildings Standard, which will set tougher targets for non-domestic buildings, as part of the government’s two-step overhaul of building regulations in England.

Both current and future changes to regulations aim to ensure that all new homes create only around a quarter of the carbon emissions previously seen with houses built under the old rules. Eventually, it’s hoped that a reduction of 75–80% will be achieved.

How can I ensure my project – including my rooflight – complies with Part L?

Using the ‘fabric-first’ approach – and considering all the tiny details – before a brick is even laid is the best option.

The fabric-first approach means you give extra consideration to the building’s fabric – that is, the physical elements (frames, insulation, windows, floors, doors, roofs and, of course, rooflights which separate the inside environment from the outside – to prioritise heat conservation right from the start of the project.

This extra attention to detail and consideration of using high-quality materials and suppliers should result in a compliant project.

To ensure compliance, we recommend you buy your upstand from the same supplier as your rooflight (like us!).

Could a non-compliant upstand mean my project isn’t signed off by building regulations?

In a word, yes.

As we mentioned earlier, regulations don’t just apply to the building itself: structural assets such as walls, windows, doors and rooflights must comply with the required U-value. And for your rooflight to be compliant, your upstand must be too.

Non-compliant rooflights would certainly increase the likelihood of a project failing to be signed off by building regulations.

Where can I buy a compliant upstand?

When you purchase a rooflight and upstand through us, your rooflight system is guaranteed to be Part L compliant. 

Our custom-made upstands:

  • Provides the perfect fit, regardless of the shape or size of your rooflight.
  • Guarantees consistency whether you fit one rooflight or one hundred!
  • Complies with Part L regulations.
  • Can be built to be angled or flat, depending on your requirements.
  • Can be made for warm and cold roofs.
  • Is exceptionally thermally efficient.
  • Is designed and made by skilled carpenters and engineers.
  • Is made from sustainable materials

What should I do if I’ve already purchased a rooflight?

If you’ve already bought your rooflight from us but haven’t fitted it yet, we can supply you with a fully compliant upstand. Contact us for a quote.

Part L Grace Period for Rooflight Installation | EOS Rooflights

Contact our team

If you have any questions, would like a bespoke price or want to enquire about our installation service. Give us a call or drop an email:

Call EOS Rooflights today 0208 462 3557

Eamil EOS Rooflights Today [email protected]

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4.83 Average

315 Reviews


Easy to deal with, the pricing was great and delivery of 5 skylights was quick and stress free. One small problem was quickly resolved, great company.

Posted 5 months ago

Justin David Davis

Great product despatched and delivered very quickly

Posted 5 months ago


Great rooflights

Posted 5 months ago


Recently purchased an electric roof light from EOS. Very happy with the finished product, study and functions very well. It also looks very stylish. I received excellent customer service from EOS at all stages, they couldn't have been more helpful. Highly recommended.

Posted 6 months ago


Great Rooflights , simple to fit and swift delivery, many Thanks

Posted 7 months ago

Liam Grenander

Very professional customer support / sales team. Dealt with our roof light enquiry quickly and kept me updated on transit and delivery. Will be purchasing roof lights from them again when our projects require them.

Posted 7 months ago

Brad Lander - Bailand Construction Ltd

EOS Rooflights were knowledgable in their field, very helpful and the products (Roof Lantern and Flat glass roof lights) were of a good quality. The Roof lights were easily installed and full installation instructions were supplied for those who are installing for the first time. Would recommend.

Posted 7 months ago

A Memet

Very efficient with processing my order and delivery. I ordered a 3M roof lantern and a smaller flat roof light. Both were simple to install on my own upstands and they both look great. My only negative was the cost was a lot for what they are but I don’t think eos are excessively expensive, I think the roof lanterns themselves are what’s pricey. Anyhow I’m happy 😃

Posted 10 months ago


EOS were brilliant all through the consultation/sales process and delivery. The skylight looks great and works a treat with the electronic switch. Their after-care support was also very helpful and patient when we mistakenly thought we had an issue. Would highly recommend them.

Posted 11 months ago

Jonathan Tregidga Buyer at Legacy

As a company we have used EOS for some time. We use the EOS Rooflight Flexi Lid product a lot and also the EOS Smoke Vent Rooflight AOV on our projects. We cannot fault the company for the service, communication and value for money.

Posted 1 year ago


Excellent products, great customer service and post sales support! Unfortunately the courier damaged our roof lights slightly, however EOS went above and beyond to rectify! Special mention to Natalie O’Hara in ops, she was so helpful, prompt and a real pleasure to deal with! Highly recommend EOS!

Posted 1 year ago


Great delivery, great product. Really helpful customer service to organise the delivery of the rooflight

Posted 1 year ago


My Eos rooflight turned up on time as always, simple to install and looks great, throws so much light into what was a dark space, the quality of the rooflight is amazing, I will continue buying from Eos in the future,

Posted 1 year ago

Clive Woodford

The rooflights are a key feature externally of the property as they are prominent on the flat roof. They are angled by 15 degrees to allow the south facing sun to enter the house maximising natural light and also utilising any solar gain. The majority are triple glazed, with a couple of larger opening lights being double glazed. Internally they provide so much light and the light shafts are a characteristic of the internal architecture given that there are 15 within the house. The ordering and supply process was straightforward and installing them worked well with the pre-made upstands. All in all a very satisfactory and successful decision to select Eos rooflights.

Posted 1 year ago

Mr Jones

I was after rooflights with laminated glass and of good quality! I contacted EOS after seeing and viewing their products. They fitted the requirements. The service was first rate, nothing was a problem and the drawings to work before delivery excellent. Would highly recommend.

Posted 1 year ago

Matt Wilson

Great quality rooflight, delivery was as planned and on time. We will be using this company again.

Posted 1 year ago

Dave R

Professional and friendly throughout. Delivery was prompt and product is great.

Posted 1 year ago

Mr J Tregidga Buyer (Legacy Construction)

As always the service was excellent. Item was installed and gave us the finish that we expected and is a quality product to go with our quality development. EOS never seem to deliver on quality and in service

Posted 1 year ago

Chris Law

Most importantly, a brilliant product - we are absolutely delighted. On top of that, great customer service and excellent price.

Posted 1 year ago


Great communication and customer service. Lovely staff, all willing to help. Delivery was swift and hassle free. Awesome rooflight. Great feature to our ongoing project. If I needed another rooflight, I would definitely use EOS again.

Posted 1 year ago


Excellent customer service and advice and top quality product. Thank you

Posted 1 year ago