FENSA certificates: what homeowners must keep

01 What does a FENSA certificate actually prove?

When you replace an external window or door in your home in England, the law requires two things at once. The work must meet the relevant building regulations, and the council must hold a record of that compliance. A FENSA certificate brings those two points together on one page. It confirms compliance, it records registration with the local council, and it shows that the installation meets the energy-efficiency requirements set by the regulations.

The same page carries two further signals for you as owner. It verifies that the written guarantee from your installer is insured, and it gives you a document to show when you sell the property. That link with a future sale is practical. You live with the windows, but a buyer cannot see inside the wall junction or the frame fixing, so the paper stands in for work that is now hidden. Keep it where you keep deeds and guarantees, because the page does not publish a replacement route if you lose it.

02 Which jobs sit inside the scheme and which sit outside?

The scheme described on the source page covers replacement of external windows, doors, roof windows and roof lights in your home, assessed against the relevant building regulations. Two conditions define that coverage. The property must sit on its original footprint, and the use and size of rooms must not be altered. In plain terms, like-for-like replacement in the existing openings stays inside, while work that changes the shape or purpose of space moves outside.

The exclusions matter as much. The page does not place new conservatories, porches, new builds or new extensions inside the scheme, and it also leaves out repairs where the frame is not included and commercial properties. A later passage narrows the domestic cover further to the habitable and heated sections of your home, with other structures such as a garage treated separately. If your project touches those outer areas, the replacement windows hub can help you place the rules before you ask for quotes.

03 Why registration with the council matters to you

Not all installers comply with building regulations, and not all of them will register your installation with the local council. That sentence from the source page explains why you cannot leave paperwork to chance. Compliance and registration are required by law, and the page places responsibility on you as owner to make sure registration happens. The installer does the physical work, but you carry the duty to see that the record exists.

The reason is simple once you follow the chain. Without registration there is no independent trace that the replacement met the rules on the day it was fitted. If you later sell, you have nothing neutral to show. If a defect appears, you have no starting point for discussion with the installer or with the council. Asking at the start whether you will receive a FENSA certificate, and getting that promise alongside the quote, turns a legal duty into a normal part of buying windows and doors.

04 How do you check an installer before you sign?

Each FENSA Approved Installer, from large national brands to small local companies, is assessed regularly to maintain compliance with building regulations over time. You can look for your nearest approved installer through the search tool on FENSA's homeowner pages, which allows a search by postcode, by company name and by registration number. Use all three fields if you have them, because a similar trading name can mislead and the number gives a firmer match.

When you use an approved installer, the page says that the installer should always promise you a certificate when the job is done. Make that promise explicit before you agree. Ask in plain words whether a FENSA certificate is included, what name will appear on it, and who sends it to you. The page does not publish a fee or a waiting time for the certificate itself, so write down what you are told and keep it with the quote. That note costs nothing and serves as a memory aid if names or dates shift later.

05 Where should the certificate sit in your paperwork?

Treat the certificate as separate from the sales brochure, the survey sheet and the guarantee. The guarantee is issued by your installer and not by FENSA, and it covers the products and the terms your installer wrote. The certificate covers compliance of the installation with building regulations and its registration. Issues with the products themselves fall under the guarantee given to you by the installer, so you need both papers and you need to know which one answers which question.

After 2014 a second paper may sit beside them. Installations completed after 2014 may have an insurance backed guarantee policy, also called a warranty insurance policy, which is separate from the certificate and issued by an insurance broker. It covers the written guarantee if the installer ceases to trade. Installations completed in 2013 or earlier may not have such a policy, as it was not mandatory until 2014. Look first through all your paperwork, then, if needed, ask for help to find the broker details and contact the broker directly about a claim. Another option named on the page is your own home insurance policy. The efficiency rules for windows sit in a different set of papers, so file the certificate where a buyer or a council officer would look first.

06 What if no certificate was ever issued?

Start from what the installer said at the time. If the firm did not mention that you are responsible for registration and did not offer a FENSA certificate or other building regulations compliance certificate, the page says you will need to pay for an inspection by building control. Allow a few hundred pounds for this route, and make sure the installer agrees in the quote to put right any non-compliance found by the building inspector. That written agreement matters because, if there are problems and you cannot get the original firm back, you may need to hire another firm to put things right at your cost.

Where the job should have been inside the scheme but no record exists, write to the firm that did the work, set out what you want addressed, and allow a reasonable time for a reply. If you have done that and you remain unsatisfied, the page points you to your local Trading Standards office. You may also briefly outline the matter in an email for guidance, on the understanding that this does not count as a submitted complaint. FENSA can only review matters tied to installations completed by approved installers, so that first letter to the installer shapes everything that follows.

07 What happens if something goes wrong after fitting?

The source page filters complaints through five questions. It asks whether the complaint concerns compliance with building regulations for replacement windows or doors in a habitable area of a domestic building, whether the firm was an approved installer, whether the job involves a new build, new extension, conservatory, outbuilding such as a garage or porch, whether it concerns the guarantee, and whether you seek a refund or compensation. Those filters explain why some cases move forward and others are sent to the council, to Trading Standards or to the guarantee route.

Inside its scope, FENSA can only ask the installer that did the work to carry out remedial works for compliance; it cannot recommend another installer, and it will only address the original installation rather than remedial works done by someone else. Always check that extra work by another firm will not affect your guarantee before you agree to it. Because the guarantee comes from the installer, that firm must address matters under its terms, and if its own complaints process is exhausted the page again points to Trading Standards. For money disputes alone, it points to the Alternative Dispute Resolution provider named by your installer or to Trading Standards, and it aims to reply to compliance complaints within 5 working days. For new builds or new extensions it points to Local Authority Building Control.

Pull your folder today, put the certificate, the written guarantee and any insurance-backed policy in one sleeve, and write the installer name and registration number on the front so the next person to open it can act without delay.