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Gas Boiler Commissioning Record (Benchmark)

A Gas Boiler Commissioning Record — commonly known as the Benchmark certificate — is issued when a new gas boiler is installed and commissioned. It confirms the engineer has set up the boiler correctly, checked gas pressures, verified flue integrity, and recorded combustion readings. All major boiler manufacturers require a completed Benchmark certificate to validate the warranty.

Building Regulations Part L, BS 6798, Benchmark SchemeValid: One-off (per installation)

What it covers

  • Boiler model, serial number, and GC number
  • Gas supply pressure and burner pressure readings
  • Flue system type, route, and termination position
  • Combustion analysis (CO, CO2, flue temperature)
  • System water treatment and inhibitor details
  • Heating and hot water controls configuration

Who needs a Benchmark Commissioning Record?

Homeowners having a new boiler installed
Landlords
Building Control
Boiler manufacturers (warranty validation)

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Frequently asked questions about Benchmark Commissioning Record

Is a Benchmark certificate legally required?
Building Regulations Part L requires commissioning of new boilers, and the Benchmark certificate is the industry-standard way to demonstrate compliance. Without it, the boiler manufacturer may void the warranty — which can be worth thousands of pounds.
What is the difference between a Benchmark and a CP12?
A Benchmark commissioning record is issued once when a new boiler is installed. A CP12 (Gas Safety Record) is an annual safety check of all gas appliances at a property. They serve different purposes — Benchmark proves correct installation, CP12 proves ongoing safety.
Can a homeowner complete the Benchmark themselves?
No. The Benchmark must be completed by a Gas Safe registered engineer who installed or commissioned the boiler. The engineer records pressure, combustion, and flue readings that require specialist instruments.

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