Certified workmanship to industry standards

APPLY NOW > To join our CQ-Assured installer scheme

  • Stand out as a reliable, trustworthy tradesperson
  • increase your sales potential
  • The only ‘true’ certification scheme that covers all building fabric trades in the RMI sector (Repair, Maintenance & Improvement)
  • Access to our industry leading customer support from an award-winning certification body

Our certification provides consumer confidence in your brand. Our scheme is designed by tradespeople for tradespeople to save you money and increase your sales potential.

HOW CQ-Assured WORKS >

Certification >

Certification takes the same format as all our schemes with initial certification and regular surveillance. However, for site operative assessment we check the site supervisors for technical and supervisory competence rather than each installer. As part of the certification process you must agree to our consumer code.

Job Registration >

> All work that falls under your certification scope must be pre-registered with the scheme and signed off on completion except where the contract value is under £500 or where the installation is registered with another of our certification schemes such as Competent Person.


Certificate Issued >

We check a sample of work registered with our scheme to ensure the installation meets scheme requirements. Certass issue a Certificate of Conformity as evidence that you have self-certified the installation is to appropriate industry standards and codes of practice. 


Real Certification improving consumer confidence

This Certass Certification Scheme has a robust framework to ensure your business reputation is protected. We check workmanship on-site against appropriate industry Codes of Practice for workmanship standards. This scheme includes:

  • an initial company assessment
  • assessment of site supervisors
  • sample of on-going installations

Workmanship Warranty

Each installation lodged with the scheme will be issued with a Certificate of Conformity and an insurance backed workmanship warranty, protecting your customer in the event you are unable to meet your workmanship guarantee obligations.

Offer 0% Finance

This is provided via our finance partner. Whether you are authorised under the Financial Conducts Authority or not, we can help. Approval is subject to our finance partner’s criteria.

Dispute Resolution

Every contractor, no matter how good, at some point will have a dispute they just cannot resolve. Certass offer a low cost alternative to court proceedings with our Alternate Dispute Resolution service.

  • Free ADR membership, no additional annual fees
  • Professional trained mediators
  • Low, and in some instances, no cost case fees for our members
  • Low case fees for consumers

Discounts on Approved Inspector fees

Where the installation work requires Building Regulation approval, we have built our user interface to allow you to instruct our Approved Inspector partner to carry out the Building Regulations approvals at discounted rates.

Government Endorsed Standards

The scheme also includes free TrustMark membership where applicable.


From property extensions to individual trades.

The scheme is designed for all aspects of domestic repair, maintenance and improvement and allows a company to self-certify its installations for appropriate Codes of Practice.

As building fabric specialists we only cover the building fabric we do not cover services such as electrical of plumbing and heating.

Many installation contractors are specialists in their trade, however we recognise that many projects are multi-trade. We have designed the scheme for the needs of industry to be fully adaptable.


General Builders (multi-trade)

> General Joinery

> Roofline (Fascia, Soffit, Gutters)

> Window & Door Repair, Replacement, New Build Installation

> Masonry (Brick/Stone/Block)

> Concrete Finishes/Screeds/Paving

> Plasterers/Renderers

> Roofers

Tilers Floor & Wall

> Painters and Decorators

> Kitchen Fitters


A cavity clearance scheme that can be relied on.

The certified company registered with us to self-certify it has adequately cleared the cavity and provide an insurance backed workmanship warranty.

There are many examples of both good and bad practice in cavity clearance. Our scheme is designed to give clients confidence that the clearance system and workmanship provide an adequate finish. 

The cavity clearance systems approved by our scheme are designed to provide at least a 97% clearance rate when undertaken in a workmanlike manner.


> Clearance of material from within an existing cavity wall

Making good on completion



Conservatories and conservatory warm roofs.

This scheme is designed to give consumers confidence when selecting a contractor for conservatory erection and warm roof replacements.

Conservatory erection is a multi-trade build and often aspects are subcontracted without adequate supervision, this is generally where the installation issues are found.

The business registered meets the requirements to provide the consumer with a fully certified installation for all work aspects including sub-contracted works.


Conservatory erection

> Conservatory Warm Roofs


This is NOT a Building Regulation notification scheme. Where Building Regulation notification is required it must be done via either Local Authority, Approved Inspector or Competent Person Scheme as appropriate.


Certass Limited, PO Box 26332, Ayr, KA7 9BJ. Registered Address: First Floor, 14 Castle Street, Liverpool, L2 0NE. Registered in England & Wales, Company Reg No 4350234. Certass Limited is an Appointed Representative of Guarantee Protection Insurance Limited, which is authorised by the Prudential Regulation Authority and regulated by the Financial Conduct Authority and the Prudential Regulation Authority. © Copyright Certass