What’s The Difference Between FENSA and Assure Certifications?
If you’re replacing your windows or doors in Leicester, you’ve probably come across two important certifications: FENSA and Assure.
Both are government-authorised Competent Persons Schemes that ensure replacement window and door installations comply with UK Building Regulations. But what’s the difference between them? And does it matter which one your installer is registered with?
In this guide, we’ll explain:
- What FENSA is
- What Assure is
- Whether Assure certification is the same as FENSA
- Why certification matters for Leicester homeowners
Why Certification Matters
Since 2002, all replacement windows and doors in England and Wales must comply with Building Regulations.
If your installer is registered with a scheme like FENSA or Assure, they can self-certify that the installation meets legal requirements. This removes the need for a separate inspection from your local council.
Without certification, you may:
- Struggle to sell your home
- Need to pay for retrospective building control approval
- Experience delays during conveyancing
That’s why choosing a certified installer is essential.
What is FENSA?
FENSA (Fenestration Self-Assessment Scheme) is one of the most recognised certification schemes in the UK.
It was established to allow registered window and door installers to self-certify compliance with Building Regulations.
When a FENSA-registered installer completes your installation, you receive:
- A FENSA certificate confirming compliance
- Registration of the work with your local council
- Deposit protection (where applicable)
- Insurance-backed guarantees
FENSA is widely known because it has been operating longer and has a large membership base.
What is Assure?
Assure is also a government-authorised Competent Persons Scheme and is UKAS-accredited, meaning it is independently assessed against rigorous standards.
Assure allows registered installers to self-certify that replacement windows, doors, roof windows and roof lights comply with Building Regulations in England and Wales.
Key features of Assure include:
- UKAS accreditation
- Independent auditing of installations
- Ongoing installer assessments
- Emphasis on continual professional development (CPD)
- Insurance-backed guarantees
- Registration of installations with local authorities
Assure places strong emphasis on installer auditing and maintaining high technical standards.
Is Assure Certification the Same as FENSA?
Yes, in terms of legal compliance, Assure certification is the same as FENSA.
Both schemes:
- Are authorised by the UK government
- Allow installers to self-certify compliance
- Issue official certificates recognised during property sales
- Ensure installations meet Building Regulations
- Provide deposit protection and insurance-backed guarantees
The difference lies mainly in brand recognition and auditing approach.
FENSA is the more widely recognised name. Assure, however, is UKAS-accredited and places a particularly strong focus on independent auditing and ongoing professional development.
For homeowners in Leicester, an Assure certificate is just as valid as a FENSA certificate when selling your home or proving compliance.
Key Similarities and Differences
Similarities
Both schemes provide:
- Building Regulations compliance
- Insurance-backed guarantees
- Deposit protection
- Dispute resolution support
- Installer competence requirements
Differences
- FENSA has a larger, longer-established membership base
- Assure is UKAS-accredited
- Assure places strong emphasis on independent audits and CPD
In practical terms, both provide the same legal protection to homeowners.
Why Leicester Homeowners Should Choose a Certified Installer
If you’re replacing windows or doors in Leicester or the wider Leicestershire area, certification protects you legally and financially.
A certified installer ensures:
- Your installation meets energy efficiency standards
- Safety regulations are met
- Your property records are updated correctly
- You receive the correct documentation
- Your investment is protected
Without certification, you could face complications when selling or refinancing your home.
Phair Windows: Assure Certified Installers in Leicester
At Phair Windows, we’re proud to be Assure certified.
For over 25 years, we’ve been installing high-quality double glazing across Leicester, Oadby, Wigston, Hinckley and the wider Leicestershire area. Our Assure certification reflects our commitment to:
- Full Building Regulations compliance
- Independently audited installations
- Ongoing professional training
- Insurance-backed guarantees
- High installation standards
When you choose Phair Windows, you can be confident your installation is legally compliant, professionally completed, and fully certified.
Need Advice or a Quote?
If you’re replacing your windows or doors and want complete peace of mind, our friendly Leicester-based team is here to help.
Contact Phair Windows today for expert advice or a free, no-obligation quote.
Related Articles:
- Do Your Doors and Windows Require a FENSA Certificate?
- Aluminium vs uPVC Windows
- How Long Does Double Glazing Last?
- What is a Casement Window?
- How Long Do uPVC Windows Last?
- Will New Double Glazed Windows Save Energy?
- How to Tell the Age of Double Glazing
