Landlord Gas Safety Certificate Cost Calculator
Estimate what your annual gas safety certificates (CP12) will cost across one property or a whole portfolio, with extra appliances, discounts and a multi-year budget.
Budget Your Gas Safety Checks
Enter how many properties you let, how many gas appliances each has, and the rates your engineer charges. The calculator works out the cost per property, your annual total and a budget over several years.
Gas Safety Certificate Cost Calculator
Use your own engineer’s rates for an accurate figure.
How the Cost Is Worked Out
Four steps from rates to your yearly budget
Price One Property
Take the first appliance cost and add the extra appliance cost for each additional appliance. At £70 plus one £15 extra, that is £85.
Multiply by Properties
Multiply the per-property price by the number of properties you let. Three properties at £85 comes to £255.
Apply Discount and Services
Take off any portfolio discount, then add boiler servicing if you book it alongside the check.
Budget Over Time
Multiply the annual total by the number of years, or divide by 12 to see what to set aside each month.
Landlord Gas Safety Rules at a Glance
The main timing requirements that sit behind every landlord gas safety certificate in Great Britain.
| Requirement | Timing | What It Means |
|---|---|---|
| Annual gas safety check | At least every 12 months | A Gas Safe registered engineer checks every gas appliance and flue you provide. |
| Early renewal | Up to 2 months before expiry | You keep your original expiry date when you book inside this window. |
| Copy to existing tenants | Within 28 days of the check | Give each current tenant a copy of the Landlord Gas Safety Record. |
| Copy to new tenants | Before they move in | A valid record must be provided at the start of the tenancy. |
| Keep your records | At least 2 years | Keep a copy of each record so you can show you stayed compliant. |
| Use a registered engineer | Every check | Confirm the engineer’s Gas Safe registration and appliance competence before the visit. |
These rules apply to rented homes in England, Scotland and Wales under the Gas Safety (Installation and Use) Regulations 1998. Northern Ireland has different rules. This tool gives general information, not legal advice.
Gas Safety Certificate FAQ
Answers to the most frequently asked questions about landlord gas safety certificate costs.
A landlord gas safety certificate typically costs about £60 to £90 for a property with a boiler and one other gas appliance, with each additional appliance adding roughly £10 to £25. Prices vary by region, engineer and the number of appliances, and combining the check with an annual boiler service can work out cheaper than booking twice.
Add the cost of the first appliance to the cost of each extra appliance to get the price per property, then multiply by the number of properties and subtract any portfolio discount. For example, a £70 first appliance and one £15 extra appliance costs £85 per property, or £255 a year across three properties.
A gas safety check must be carried out at least every 12 months. You can have it done up to two months before the current certificate expires and keep your original expiry date, so booking early does not shorten the year.
Only a Gas Safe registered engineer can carry out the check and issue the Landlord Gas Safety Record, commonly called a CP12. Existing tenants must receive a copy within 28 days of the check, and new tenants must receive a copy before they move in.
The cost of a gas safety check is generally treated as an allowable expense against rental income for UK landlords. Tax rules depend on your circumstances, so confirm with an accountant or HMRC before you claim.