What is a CML Certificate?

CML Certificates Explained

A CML certificate is a document from a professional consultant (such as a chartered architect, surveyor, or engineer) confirming that a newly built or converted property has been constructed in line with its approved plans and Building Regulations. 

Lenders typically ask for a CML certificate when a property doesn’t have a formal structural warranty in place, and it’s their way of getting assurance before releasing mortgage funds.

CML certificates are also sometimes referred to as an Architects’ Certificate, or more accurately today, a Professional Consultants’ Certificate (PCC). The CML itself no longer exists, so “CML certificate” is legacy terminology that’s stuck around even though the correct current name is PCC.

If you’re a self-builder, small developer, or buyer of a converted property and your lender or conveyancer has mentioned this requirement, here’s what it actually covers, when you need one, and how to get it.

What Does CML Stand For?

CML stands for Council of Mortgage Lenders, an industry body formed in 1989 from a merger of several UK mortgage lending associations. It represented lenders’ interests, gathered housing market data, and published the CML Handbook, which set out instructions for lenders and conveyancers handling residential property transactions.

In 2017, the Council of Mortgage Lenders merged with five other financial organisations to form UK Finance, which now represents around 300 firms across banking, mortgages, and financial services. The CML Handbook became the UK Finance Mortgage Lenders’ Handbook, and any reference to “CML guidance” since 2017 is understood to mean UK Finance guidance instead.

The certificate itself didn’t disappear when the CML did. It was simply renamed the Professional Consultants’ Certificate, and that’s the name providers and lenders use today, even though “CML certificate” remains common shorthand in the industry.

When is a CML Certificate or PCC Needed?

A CML certificate, or PCC, is typically needed in a specific set of circumstances rather than for every property purchase. The most common situations where it’s needed are:

• Properties with no formal structural warranty in place: Properties built without cover from a scheme like NHBC or Premier Guarantee often need a PCC to satisfy the lender instead.
• New build or conversion properties without a registered developer: Self-builders and small developers not registered with a warranty scheme frequently rely on a PCC rather than setting one up retrospectively.
• Lender requirement before releasing funds: Some lenders will not complete a mortgage on a new or converted property until a PCC or equivalent cover is confirmed, regardless of how the build was managed.
• Buy-to-let and equity release on new-build property: Landlords raising a mortgage against a recently converted or built property may also be asked for a PCC as part of the lending criteria.

If your property already has a structural warranty, a CML certificate generally isn’t required alongside it. It’s the fallback option when that formal warranty doesn’t exist.

What is Covered Under a CML Certificate?

A CML certificate confirms that a professional consultant supervised key stages of construction and can verify the building was completed to a satisfactory standard, in compliance with Building Regulations and the approved plans. 

It’s important to understand what is not covered under the certificate. A CML certificate is not the same as a Structural Warranty or Latent Defects Insurance, and therefore won’t automatically pay out for repairs if defects appear later. 

Instead, it gives the lender assurance in the absence of another policy, and any claim you make afterwards depends on proving the consultant was negligent, which can be a lengthy legal process. Here’s the difference:

CML Certificate / PCC:

• What it confirms: Build complies with approved plans and Building Regulations
• Claim route: Must prove consultant negligence
• Typical duration: 6 years
• Cost: Generally lower

Structural Warranty:

• What it confirms: Ongoing cover for structural defects
• Claim route: Direct claim against the warranty policy
• Typical duration: Typically 10 years
• Cost: Generally higher, reflecting broader cover

Because of this gap in cover, some builders and developers choose a CML/PCC purely for speed and lower cost, accepting the narrower protection in exchange.

Who Can Issue a CML Certificate?

Only a suitably qualified professional consultant can issue a CML certificate or PCC. This typically means a chartered architect, surveyor, or engineer registered with a recognised body such as RICS, CIOB, CIAT, or the Architects Registration Board.

The consultant must hold professional indemnity insurance covering the certificate’s full term, while the provider issuing it must be approved by UK Finance for the certificate to be accepted by mainstream lenders. Not every lender accepts every provider, so it’s worth checking your lender’s approved list before committing to a provider.

Here at ABC+ Warranty, we provide 6 and 10-year Professional Consultants’ Certificates accepted by most major UK banks and building societies. You can view our current list of accepting lenders before applying.

GET A QUICK QUOTE HERE

Before you proceed, check that your mortgage lender accepts PCCs from your chosen provider, since acceptance varies. If you decide later that you’d prefer the broader protection of a Structural Warranty, it’s possible to switch, either before construction completes or afterwards, and our team can talk you through what that involves.

GET A STRUCTURAL WARRANTY QUOTE

Feel free to get in touch with our team to discuss your circumstances. Email our team on abc@architectscertificate.co.uk, contact us via Whatsapp or call our office on 0161 928 8804.

CALL OUR OFFICE

FAQs on CML Certificates

Is a CML certificate the same as a PCC?

Yes. A CML certificate and a Professional Consultants’ Certificate (PCC) refer to the same document. “CML certificate” is the older name, used before the Council of Mortgage Lenders merged into UK Finance in 2017.

How long does a CML certificate last?

A CML certificate or PCC typically provides 6 years of cover from the date of issue, during which the consultant remains liable to the lender and purchaser through their professional indemnity insurance.

Can I get a CML certificate after construction is finished?

In most cases, yes, provided the consultant can still verify compliance with the approved plans and Building Regulations. It’s best to arrange this as early as possible, ideally with a consultant involved during construction rather than after the fact.

Do all lenders accept a CML certificate?

No. Acceptance varies by lender and by provider, so it’s important to check your specific lender’s approved list before applying for a PCC.

Can I switch from a CML certificate to a Structural Warranty later?

Yes. It’s possible to move from a PCC to a full Structural Warranty either before construction completes or after the property is finished, though the options and cost will depend on your specific circumstances.