Do Sash Windows Require FENSA? Comprehensive Guide

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Understanding the FENSA Certificate

When it comes to ensuring the compliance and quality of replacement windows and doors in your home, understanding the FENSA Certificate is crucial. FENSA, which stands for Fenestration Self-Assessment Scheme, is a government-approved initiative that verifies that installations comply with building regulations. Let’s delve into the various aspects of the FENSA Certificate, ranging from its inclusions and exclusions to its necessity and consequences.

Inclusions of a FENSA Certificate: What’s Covered?

A FENSA Certificate covers a wide array of factors related to window and door installations. This includes ensuring that the products are energy-efficient, structurally sound, and compliant with the thermal performance standards set by the government. Additionally, it verifies that the installations meet the necessary safety requirements, providing homeowners with peace of mind regarding their property’s security.

Exclusions from a FENSA Certificate: What’s Not Included?

While FENSA Certificates encompass various aspects of window and door installations, certain elements fall outside their scope. For instance, decorative features like stained glass designs or speciality finishes might not be covered. Understanding these exclusions is vital to avoid misunderstandings during the installation process.

Appearance of a FENSA Certificate: What to Look For

A genuine FENSA Certificate carries a specific appearance. It features the FENSA logo, details of the installation company, and a unique registration number. Homeowners should carefully examine these certificates to ensure their authenticity and the legitimacy of the installation.

Necessity of a FENSA Certificate: Why Is It Important?

Having a FENSA Certificate is not just a matter of paperwork; it is a testament to the quality and legality of your home improvements. Many local authorities and mortgage lenders require this certificate as proof of compliance with building regulations. Without it, homeowners may face significant hurdles, including legal complications and challenges during property sales.

Obtaining a FENSA Certificate: The Process Unveiled

To obtain a FENSA Certificate, homeowners need to hire a FENSA-approved installer. These professionals are well-versed in the regulations and standards, ensuring a smooth process from start to finish. The installer will conduct the necessary assessments, submit the paperwork, and, upon approval, provide the homeowner with the official FENSA Certificate.

Consequences of Absence of a FENSA Certificate: What’s at Stake?

If a homeowner neglects to acquire a FENSA Certificate, they might face severe consequences. Local authorities have the right to issue enforcement notices, requiring corrective actions to be taken. Moreover, during property transactions, the absence of a FENSA Certificate can deter potential buyers, leading to delays and financial losses for the seller.

Replacing a Lost FENSA Certificate: Steps to Take

In the unfortunate event of losing a FENSA Certificate, homeowners can rectify the situation by contacting the original installation company. They can provide a duplicate certificate, ensuring that the homeowner has the necessary documentation for legal and transactional purposes.

Validity Period of a FENSA Certificate: How Long Does It Last?

FENSA Certificates have a specific validity period, typically 10 years from the installation date. Homeowners must be aware of this timeframe to plan for any necessary replacements or updates before the certificate expires.

Selling a Property without a FENSA Certificate: Risks and Considerations

Selling a property without a valid FENSA Certificate can pose significant risks. Potential buyers may insist on lower prices, request post-sale inspections, or, in some cases, back out of the deal entirely. Therefore, it is advisable for sellers to proactively obtain or update their FENSA Certificate before listing their property.

FENSA Approved Installations: Ensuring Quality and Compliance

Opting for FENSA-approved installations guarantees not only compliance with regulations but also high-quality workmanship. FENSA-approved installers undergo rigorous assessments, ensuring that they meet the industry standards. Homeowners can have confidence in the expertise and professionalism of these installers, leading to superior outcomes for their home improvement projects.

In conclusion, understanding the nuances of the FENSA Certificate is vital for homeowners undertaking window and door installations. From its inclusions and exclusions to its necessity and consequences, every aspect plays a crucial role in ensuring the legality, safety, and quality of home improvements. By being well-informed and working with FENSA-approved installers, homeowners can navigate this process smoothly, enhancing the value and comfort of their homes.


Can you fit windows without being FENSA registered?

Yes, you can fit windows without being FENSA registered, but it’s advisable to hire a certified professional to ensure the work meets building regulations.

What happens if I have no FENSA certificate?

If you have no FENSA certificate after window installation, it might cause issues when selling your property, as potential buyers often seek this certification as proof of compliance with building regulations.

Does FENSA apply to wooden windows?

FENSA primarily applies to replacement windows and doors; it doesn’t specifically cover wooden windows. However, other regulations might still apply to ensure proper installation and compliance.

Are there alternatives to FENSA?

Yes, there are alternatives to FENSA. Competent Person Schemes (CPS) are one such alternative, where certified installers self-certify their work, ensuring it complies with building regulations.

Do I need a FENSA certificate for replacement glass?

FENSA certification typically covers the installation of complete windows and doors, not just replacement glass. If you’re only replacing the glass, FENSA certification might not be necessary, but local regulations should still be followed.

About the author

Glen Ramsey, who presently holds the positions of customer support and content manager, is a cherished member of the Sash Window Refurbish team. He is in a unique position to provide advice on all questions pertaining to the renovation of historic windows because he has a wealth of experience in all elements of window renovation, dealing with clients regularly and assisting them in choosing the best window-related course of action. He oversees the creation of information for all of our platforms in his capacity as content manager, including web content and other materials. Glen has witnessed the whole gamut of Sash Window Refurbish's window restoration activities, from our work on significant listed Georgian homes to a wide variety of smaller-scale private residential projects.


My technician Andrew replaced all my sash windows that had rotten sills. Accessing the rotten sills was not an easy task. He explained to me what needed to be done in order to fix the problem. He is a great person and I’m happy that he was the one who did the job. He is reliable, tidy, friendly and very professional. I highly recommend him.



I hired Andrew and Alex a while back to repair my damaged sash windows. They were was very considerate and very patient as he did his job. A few days ago, I had another problem with one of my sash lock keys and I called him again to come and fix the problem. I’m very impressed that Liam responded quickly and he not only fixed the problem but he also gave me a spare key. What a great after sales service!

Alan W.


I’m very impressed with the new windows that Andrew installed and also the reconditioning job that he did on other sash windows. The quality of his work is by far more superior than what we got when we hired another company a few years back. We will certainly hire him again if any window work arises

Kelly (Sleaford)


Our decorator referred us to Andrew because some of the work needed a window expert. Andrew together with our decorator did a fantastic job. The work was done efficiently and to the highest standards. Andrew is understanding, committed and very professional. I recommend him without any hesitation.

Steaven Reader


Alex did a great job in fixing windows in our terraced house. The windows were broken, frames damaged and the wood was also rotten. Alex's job was high quality and he did it pretty fast. I was also very impressed that he was considerate of my son’s asthma condition and maintained cleanliness. Top work.



Andrew just recently replaced three sash windows in my Edwardian house. He also repaired and replaced some sills and draught proofed three windows. In addition to that, he also did some carpentry work. What I like the most about Liam is that he did a clean job. He is very professional and always updated me about the timescales and costs. He also did his job with minimal disruptions. I highly recommend him.

Cris M.