No. FENSA only certifies work by its registered installers, and an unregistered fitter cannot self-certify. Instead, the job must be notified to local authority building control, which inspects the work and charges a fee. Scotland and Wales run separate arrangements.

What are your options if you are not registered?

  • Join a competent person scheme such as FENSA or Certass, which allows you to self-certify
  • Submit a building notice for each job to local building control
  • Subcontract the fitting to a registered installer

What will building control check?

The surveyor will check that the new windows meet thermal limits (1.4 W/m²K or Band B), have trickle vents where required, use safety glazing in critical locations and provide escape openings where needed.

What paperwork should you keep?

Keep the BFRC rating, the glass spec and the building control completion certificate, as buyers’ solicitors will ask for them. Our supply-only windows come with the specification data you need. Registration also requires assessment and insurance, so it only pays off if you fit regularly.

Need a trade price? Call the trade counter on 01903 262 636 or visit us at Unit 1, Friar Walk, Worthing. We offer free delivery within 30 miles.

← Back to Supply Only Windows FAQs | See our supply only windows

MLI Building Products LTD place picture
4.6
Based on 15 reviews
Peter Hughes profile picture
Peter Hughes
2 years ago
Davyd Oddy profile picture
Davyd Oddy
3 years ago
Great service and products from super friendly staff. Specials thanks to Loretta and Stephen
Stephen Gale profile picture
Stephen Gale
4 years ago
Great service good bunch lads
Response from the owner
4 years ago
Thanks Steve.
blank blank profile picture
blank blank
4 years ago
Kimberleyjanep profile picture
Kimberleyjanep
4 years ago
So helpful - Steve was so patient while I chose my new front door - which was installed by PBM Exteriors who recommended MLI. I cannot emphasise how much my new and very contemporary front door makes the house look so modern and 'new'. Just huge thanks for great service and an amazing grey anthracite grey front door and side panels!
Photo from customer review
Response from the owner
4 years ago
You were very welcome Kim. It was our pleasure.
Elliott Prior profile picture
Elliott Prior
5 years ago
Response from the owner
5 years ago
Thank you Elliott
Richard Jones profile picture
Richard Jones
5 years ago
Great people to do business with!
Response from the owner
5 years ago
Thank you Richard.
So pleased I found MLI to supply the windows and doors for my property renovation, Excellent Prices, far more competitive than any other quote I had. Service from Steve & Loretta was amazing, nothing was too much trouble. Everyone compliments us on the fantastic windows. I highly recommend. Thank you so much
Response from the owner
6 years ago
Hi Penelope. Thank you very much. 👍🏻
Nigel Alderman profile picture
Nigel Alderman
7 years ago
Friendly efficient service
Response from the owner
4 years ago
Thank you Nigel.
sohel isat profile picture
sohel isat
7 years ago
Used to go there for delivery
Response from the owner
4 years ago
Thank you Sohel.