BUSHEY · GAS LEAK INVESTIGATION
Two leaks in existing pipework
After Cadent isolated the supply, TNG traced two leaks in old black iron pipework. The job also addressed separate wall-sleeving and bonding defects.
Read the Bushey investigation →Landlord Gas Safety Certificates (CP12)
LANDLORD GAS SAFETY · HERTFORDSHIRE & NORTH LONDON
Plan the check. Understand the findings. Keep the record.
Arrange a landlord gas safety check with TNG Services and make the requirements clear from the start. Tell us which gas appliances are provided, when the next check is due and whether you also need boiler servicing or help with an existing problem.
01 · PREPARE
Confirm the appliances
Share the property address, appliance list, previous record and access arrangements.
02 · CHECK
Complete the safety checks
The relevant appliances and flues are assessed by an appropriately qualified Gas Safe registered engineer.
03 · FOLLOW UP
Act on the findings
Keep the record, provide the tenant’s copy and arrange any necessary remedial work.
Showing the single result
A certificate should follow the checks, not replace them
A rented property can have a boiler that produces heat while part of its installation still needs attention. The landlord gas safety record documents the inspection findings; a request for a certificate is a request for the required checks, not a guarantee of a satisfactory result.
Tell us about existing concerns before booking. A reported gas smell, an isolated supply or a known flue defect needs to be identified in the enquiry rather than left for a routine appointment.
Safety checks, servicing and repairs are different jobs
What landlords need to keep track of
- Arrange the required gas safety check annually through a Gas Safe registered engineer qualified for the work.
- Give existing tenants a copy of the record within 28 days of completion; new tenants must receive it before moving in.
- Keep records for at least two years. Additional retention requirements apply if using the early-check flexibility.
- Eligible annual checks can be completed up to two months early while retaining the original deadline. Confirm the dates and records when booking.
Landlords also have maintenance responsibilities. An annual check does not remove the need to address faults reported between visits.
Why the wider installation matters
These examples come from gas leak investigation and boiler service visits. They illustrate defects found during TNG’s work; they are not presented as completed landlord CP12 inspections.
STEVENAGE · AT RISK INSTALLATION
Flue and pipework defects
An inspection found incorrect flue fall, inadequate support and securing, and an unsleeved gas pipe wall entry. The installation was classified At Risk; the article documents the findings rather than completed repairs.
See the Stevenage findings →
BOREHAMWOOD · BOILER SERVICE
Satisfactory combustion was not the whole picture
The boiler operated with satisfactory combustion readings, but the visit identified a flue defect and gas-pressure concerns. Separate cylinder and visual electrical observations were also recorded.
Explore the Borehamwood inspection →Help us plan access and the work
Send the property postcode, a list of gas appliances, the previous gas safety record and the next due date if known. Mention any faults, isolation notices or unfinished remedial work.
Confirm who will arrange access and who should receive the completed record. For more than one property, send the addresses and deadlines so the enquiries can be discussed together. Do not include unnecessary tenant personal information.
Before arranging your CP12 check
What does CP12 mean?
CP12 is a commonly used name for the landlord gas safety record. The record contains the results of the required safety checks; it is not a promise that no defects will be found.
Does a boiler service replace the landlord check?
Not automatically. Maintenance and the statutory safety check have different purposes. If you want both during the visit, request both and confirm the scope.
What happens if a fault is found?
The completed check results should still be recorded. Necessary remedial action must be arranged, and an unsafe appliance must not be used. Follow-up work should be documented alongside the original findings.
Is this also an electrical or cylinder inspection?
Do not assume that it is. EICRs, unvented cylinder maintenance and other inspections have separate scopes. Tell us if you need additional work and confirm what is included.
What affects the quote?
The appliance list, property access and agreed work matter. Include boiler servicing or existing faults in the enquiry so that separate work is not mistaken for part of a standard check.
Landlord gas safety checks in your area
Choose your area for booking information. Include the property postcode so coverage and appointment arrangements can be confirmed.
Arrange your landlord gas safety enquiry
TNG Services can discuss landlord checks across Hertfordshire and North London. Send the postcode, appliances and due date so coverage, access and the proposed visit can be confirmed.
Contact TNG ServicesLandlord responsibilities: HSE landlord guidance and gas safety records.