Question 1

Do I need Building Regulations approval for a new roof?

Accepted Answer

Yes, once you replace more than 25% of the roof covering. At that point Part L treats it as renovating a thermal element, which brings a duty to improve the roof's insulation where feasible, and the work has to be certified — either through Cheshire East Building Control or by a roofer registered with a Competent Person Scheme. The threshold is a quarter, and it catches more jobs than people expect. Replacing more than 25% of a roof covering makes it notifiable, and a full strip and re-lay obviously qualifies — but so does a substantial partial re-roof on one large elevation. What being notifiable brings is twofold. First, Part L of the Building Regulations treats a roof as a thermal element, and renovating one triggers a duty to improve its insulation to current standards where that is technically, functionally and economically feasible. That is not simply putting back what was there. Second, the work has to be signed off. There are two routes to sign-off. One is a building notice to Cheshire East Building Control, with inspections and a fee. The other is a roofer registered under a Government-authorised Competent Person Scheme — CompetentRoofer, run by the NFRC, is the roofing one — who can self-certify that the work complies and notify it on your behalf. That route is faster and usually cheaper, and it produces the compliance certificate in your name. Ask which route is being used before the scaffold goes up. It is a reasonable question and a straight answer is easy. What you should not accept is a quote that simply does not mention it, because the certificate is what a buyer's solicitor asks for years later and reconstructing compliance after the event is genuinely difficult. The insulation duty is worth seeing as an opportunity rather than a burden. Insulating a roof properly requires access to it, and access is the expensive part of any roofing job. Doing it while the scaffold is up and the covering is off costs a fraction of doing it as a standalone project later. New construction — an extension roof, a garage, a new build — is different: it falls fully within the Building Regulations rather than under the 25% renovation rule, and it normally runs through that project's own Building Control application covering structure, insulation, fire spread near a boundary and weather resistance.

Question 2

Is re-roofing notifiable?

Accepted Answer

Yes, once you replace more than 25% of the roof covering. At that point Part L treats it as renovating a thermal element, which brings a duty to improve the roof's insulation where feasible, and the work has to be certified — either through Cheshire East Building Control or by a roofer registered with a Competent Person Scheme. The threshold is a quarter, and it catches more jobs than people expect. Replacing more than 25% of a roof covering makes it notifiable, and a full strip and re-lay obviously qualifies — but so does a substantial partial re-roof on one large elevation. What being notifiable brings is twofold. First, Part L of the Building Regulations treats a roof as a thermal element, and renovating one triggers a duty to improve its insulation to current standards where that is technically, functionally and economically feasible. That is not simply putting back what was there. Second, the work has to be signed off. There are two routes to sign-off. One is a building notice to Cheshire East Building Control, with inspections and a fee. The other is a roofer registered under a Government-authorised Competent Person Scheme — CompetentRoofer, run by the NFRC, is the roofing one — who can self-certify that the work complies and notify it on your behalf. That route is faster and usually cheaper, and it produces the compliance certificate in your name. Ask which route is being used before the scaffold goes up. It is a reasonable question and a straight answer is easy. What you should not accept is a quote that simply does not mention it, because the certificate is what a buyer's solicitor asks for years later and reconstructing compliance after the event is genuinely difficult. The insulation duty is worth seeing as an opportunity rather than a burden. Insulating a roof properly requires access to it, and access is the expensive part of any roofing job. Doing it while the scaffold is up and the covering is off costs a fraction of doing it as a standalone project later. New construction — an extension roof, a garage, a new build — is different: it falls fully within the Building Regulations rather than under the 25% renovation rule, and it normally runs through that project's own Building Control application covering structure, insulation, fire spread near a boundary and weather resistance.

Question 3

Building control for roof replacement

Accepted Answer

Yes, once you replace more than 25% of the roof covering. At that point Part L treats it as renovating a thermal element, which brings a duty to improve the roof's insulation where feasible, and the work has to be certified — either through Cheshire East Building Control or by a roofer registered with a Competent Person Scheme. The threshold is a quarter, and it catches more jobs than people expect. Replacing more than 25% of a roof covering makes it notifiable, and a full strip and re-lay obviously qualifies — but so does a substantial partial re-roof on one large elevation. What being notifiable brings is twofold. First, Part L of the Building Regulations treats a roof as a thermal element, and renovating one triggers a duty to improve its insulation to current standards where that is technically, functionally and economically feasible. That is not simply putting back what was there. Second, the work has to be signed off. There are two routes to sign-off. One is a building notice to Cheshire East Building Control, with inspections and a fee. The other is a roofer registered under a Government-authorised Competent Person Scheme — CompetentRoofer, run by the NFRC, is the roofing one — who can self-certify that the work complies and notify it on your behalf. That route is faster and usually cheaper, and it produces the compliance certificate in your name. Ask which route is being used before the scaffold goes up. It is a reasonable question and a straight answer is easy. What you should not accept is a quote that simply does not mention it, because the certificate is what a buyer's solicitor asks for years later and reconstructing compliance after the event is genuinely difficult. The insulation duty is worth seeing as an opportunity rather than a burden. Insulating a roof properly requires access to it, and access is the expensive part of any roofing job. Doing it while the scaffold is up and the covering is off costs a fraction of doing it as a standalone project later. New construction — an extension roof, a garage, a new build — is different: it falls fully within the Building Regulations rather than under the 25% renovation rule, and it normally runs through that project's own Building Control application covering structure, insulation, fire spread near a boundary and weather resistance.

Question 4

The 25% rule for roofs

Accepted Answer

Yes, once you replace more than 25% of the roof covering. At that point Part L treats it as renovating a thermal element, which brings a duty to improve the roof's insulation where feasible, and the work has to be certified — either through Cheshire East Building Control or by a roofer registered with a Competent Person Scheme. The threshold is a quarter, and it catches more jobs than people expect. Replacing more than 25% of a roof covering makes it notifiable, and a full strip and re-lay obviously qualifies — but so does a substantial partial re-roof on one large elevation. What being notifiable brings is twofold. First, Part L of the Building Regulations treats a roof as a thermal element, and renovating one triggers a duty to improve its insulation to current standards where that is technically, functionally and economically feasible. That is not simply putting back what was there. Second, the work has to be signed off. There are two routes to sign-off. One is a building notice to Cheshire East Building Control, with inspections and a fee. The other is a roofer registered under a Government-authorised Competent Person Scheme — CompetentRoofer, run by the NFRC, is the roofing one — who can self-certify that the work complies and notify it on your behalf. That route is faster and usually cheaper, and it produces the compliance certificate in your name. Ask which route is being used before the scaffold goes up. It is a reasonable question and a straight answer is easy. What you should not accept is a quote that simply does not mention it, because the certificate is what a buyer's solicitor asks for years later and reconstructing compliance after the event is genuinely difficult. The insulation duty is worth seeing as an opportunity rather than a burden. Insulating a roof properly requires access to it, and access is the expensive part of any roofing job. Doing it while the scaffold is up and the covering is off costs a fraction of doing it as a standalone project later. New construction — an extension roof, a garage, a new build — is different: it falls fully within the Building Regulations rather than under the 25% renovation rule, and it normally runs through that project's own Building Control application covering structure, insulation, fire spread near a boundary and weather resistance.

Do I need Building Regulations approval for a new roof?

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