Gas Safety Certificate in London (CP12)

Silver Saints carries out landlord gas safety certificates In London

4.9 stars, 1,000+ reviews | Gas Safe registered | Fixed £100 + VAT for up to 2 appliances | One-hour arrival window | Book online 24/7

We cover all London boroughs plus the TW, KT, CR and BR postcodes.

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Clear pricing for a gas safety certificate in London

A gas safety certificate in London from Silver Saints is a fixed price, so there is no hourly meter running and no surprise on the invoice.

A worked example: a one-bedroom London flat with a combi boiler and a gas hob has 2 appliances, so the certificate is £100 plus VAT. A house with a boiler, a gas hob and a gas fire has 3 appliances, so it is £145 plus VAT. What affects the time on site is the number of appliances and how accessible the boiler, the meter and the flue are, because each appliance is checked individually against its own manufacturer data plate rather than waved through. Most inspections take 30 to 60 minutes. If the inspection finds a fault and you ask the engineer to repair it, that work is charged separately at the gas rate of £98 plus VAT per hour, and larger work is quoted after a £35 plus VAT survey visit which is only payable if you decide not to proceed.

How it works

1. Tell us the property address and how many gas appliances it has, online or by phone.
2. Pick a slot Monday to Saturday, 08:00 to 17:00. We confirm a specific one-hour arrival window.
3. A Gas Safe registered engineer attends and inspects every appliance, the pipework, the flue and the ventilation.
4. The Landlord Gas Safety Record is issued on the day it passes, emailed to you, and you pay on completion.

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Why Silver Saints

Here is why London customers have booked Silver Saints since 2008.

• 4.9 stars from over 1,000 Google reviews
• 5 stars on Trustpilot and Checkatrade
• £5 million public liability insurance
• Gas Safe registered engineers
• Operating since May 2008
• All work guaranteed
• A specific one-hour arrival window on every booking

Need a gas safety certificate in London? We can often attend within a few days, and sooner for an expired certificate.

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What is included in a CP12 certificate?

A CP12 certificate from Silver Saints in London includes a full inspection of every gas appliance in the property, the connecting pipework, the flue and the ventilation, recorded on a written Landlord Gas Safety Record. On each appliance the Gas Safe registered engineer carries out a gas tightness test across the installation, checks standing and working pressure where test points exist, and measures burner pressure and gas rate against the manufacturer data plate. Ventilation is checked so the appliance has the air supply it was designed for. Flue flow is tested to confirm the products of combustion are carried safely outside. Flame failure devices are checked for correct operation, and physical stability and stability brackets are confirmed. Anything found unsafe is recorded on the certificate and explained to you, not glossed over.

How long does a gas safety check in London take?

A gas safety check in London usually takes a Silver Saints engineer 30 to 60 minutes on site, depending on how many appliances there are and how accessible the boiler, meter and flue turn out to be. A modern flat with a single room-sealed combi is at the fast end. A property where the meter is in a communal cupboard, the boiler is on a different floor and the hob is a separate appliance takes longer, because each one is tested in its own right. Booking the appointment when you or the tenant can give the engineer access to all of it in one visit is the single biggest thing that keeps it short.

For landlords and letting agents

A landlord gas safety certificate in London is a legal requirement renewed every 12 months for any rented property with gas appliances, and Silver Saints issues them across all London boroughs plus the TW, KT, CR and BR postcodes. Under the Gas Safety (Installation and Use) Regulations 1998 you must have a Gas Safe registered engineer inspect the appliances annually, give a copy of the record to existing tenants within 28 days of the check, and give it to any new tenant before they move in. The certificate can be renewed up to 2 months before it expires without losing the original expiry date, so booking early costs you nothing and there is no reason to let cover lapse. Managing agents running annual renewal cycles across a portfolio can book multiple properties on the same call. See our landlord services for the wider set of compliance and maintenance work we handle between tenancies.

Can I book the certificate and a boiler service together?

Yes, Silver Saints carries out a gas safety certificate and a boiler service in the same London visit when both are requested at the time of booking, which is the most cost-effective way to schedule them because one Gas Safe engineer attends the property once. The two are different jobs. The certificate is the annual legal safety inspection recorded on the CP12, while a gas boiler service is the maintenance work that keeps the boiler running efficiently and protects the manufacturer warranty. Many London landlords book both on the same date each year for that reason. If the inspection turns up a fault, the same engineer can quote for gas boiler repairs rather than leaving you to arrange a separate contractor, and where a boiler is past economic repair we can talk you through boiler replacement. The certificate itself is emailed to you on completion.

Which London properties are hardest to certify?

The certificate is the same everywhere, but the work behind it varies sharply by London building stock, and that is where an engineer who works the capital daily earns their keep. In Victorian and Edwardian conversions the meter, boiler and hob are often spread across three floors with original pipework extended by successive owners, so the tightness test matters far more than it does in a new build. Period properties with a back boiler or an older open-flue appliance need careful flue flow and ventilation checks, because blocked or shared flues are one of the most common reasons an appliance fails. Mansion blocks and purpose-built flats frequently have communal or shared flue arrangements that have to be assessed in context rather than by the book. Modern new-build flats are usually a single room-sealed combi and are the quickest to certify. Knowing which to expect from the postcode before the engineer arrives is why we rarely have to book a wasted second visit.

What London customers say

Silver Saints holds 4.9 stars from over 1,000 Google reviews, alongside 5 star ratings on Trustpilot and Checkatrade. The reviews below are pulled live from our Google Business Profile and are not edited or selected by us.

You can also read our Checkatrade reviews, our Trustpilot reviews, our Yell listing and our Google reviews.

Gas Safety Certificate FAQs

Can I get a gas safety certificate in London today?

Silver Saints can often arrange a gas safety certificate in London within a few days, and sooner where the diary allows, with expired or urgently needed certificates prioritised. Same-day is not guaranteed because the appointment needs a Gas Safe registered engineer and access to every appliance. Call 0207 0999 199 or book at bookings.silversaints.com and we will confirm the earliest slot for your postcode.

How much does a gas safety certificate cost in London?

A gas safety certificate in London from Silver Saints costs a fixed £100 plus VAT and covers up to 2 gas appliances, with each additional appliance tested in the same visit for £45 plus VAT. There is no call-out fee and Saturday appointments are the same price as weekdays. Any remedial gas work you ask us to carry out afterwards is charged separately at £98 plus VAT per hour.

What is a CP12 and what does it include?

A CP12, officially a Landlord Gas Safety Record, is the document issued after a Gas Safe registered engineer inspects the gas appliances, pipework, flue and ventilation in a property. The Silver Saints inspection in London covers gas tightness, standing and working pressure where test points allow, burner pressure and gas rate against the manufacturer data plate, ventilation, flue flow, flame failure devices and appliance stability.

How long does the gas safety check take?

Most gas safety checks carried out by Silver Saints in London take 30 to 60 minutes, depending on the number of appliances and how accessible the boiler, meter and flue are. A modern flat with one combi boiler is quickest. A period property with the meter, boiler and hob on different floors takes longer, because every appliance is tested individually rather than as a set.

How often does a landlord need a gas safety certificate?

A landlord letting a London property with gas appliances must have a gas safety check carried out every 12 months by a Gas Safe registered engineer. The certificate can be renewed up to 2 months before it expires without losing its original expiry date, so booking early does not shorten your cover. Silver Saints can put a portfolio on the same annual renewal cycle.

Do I have to give my tenant a copy of the certificate?

Yes. A landlord must give a copy of the gas safety certificate to existing tenants within 28 days of the inspection, and to any new tenant before they move in. Silver Saints emails the Landlord Gas Safety Record on completion in London, so you can forward it to a tenant the same day rather than waiting for a paper copy.

Can I combine the certificate with other work in one visit?

Yes. Because every Silver Saints engineer is multi-trade as well as Gas Safe registered, one London visit can cover the certificate plus a boiler service, a radiator valve repair or small fixing and fitting jobs spotted at the same inspection. Request the extra work at the time of booking so we allow enough time in the slot.

What happens if an appliance fails the gas safety check?

If an appliance is found unsafe during the inspection, the Silver Saints engineer records the fault on the certificate, explains it to you, and takes the appropriate action for the classification of the defect, which can include disconnecting an immediately dangerous appliance with your permission. Because the engineer is Gas Safe registered and multi-trade, many faults can be quoted for and repaired without arranging a separate contractor.

Do I need a gas safety certificate if I live in the property myself?

No. The annual certificate is a legal requirement for landlords letting a property with gas appliances, not for owner-occupiers in London. Many homeowners still book the same inspection for peace of mind, particularly with an older boiler or an open-flue appliance. Commercial premises need a separate commercial gas safety certificate rather than the landlord CP12.

What access does the engineer need on the day?

The engineer needs access to every gas appliance, the gas meter and the flue, which in London often means a communal cupboard or a different floor of the building. Silver Saints works Monday to Saturday, 08:00 to 17:00, and confirms a specific one-hour arrival window so a tenant or agent can be there. Tell us at booking if the meter is in a communal area.

In summary

A Silver Saints gas safety certificate in London is an annual inspection of the gas appliances, pipework, flue and ventilation in a property, carried out by a Gas Safe registered engineer and recorded on a Landlord Gas Safety Record, commonly called a CP12. It is a legal requirement every 12 months for any property let with gas appliances. The price is fixed at £100 plus VAT for up to 2 appliances, with each additional appliance at £45 plus VAT, and the record is issued and emailed on the day the inspection passes. Appointments run Monday to Saturday, 08:00 to 17:00, across all London boroughs plus the TW, KT, CR and BR postcodes, with a specific one-hour arrival window on every booking. Silver Saints has traded since May 2008, holds 4.9 stars from over 1,000 Google reviews and carries £5 million public liability insurance. To book, call 0207 0999 199 or visit https://bookings.silversaints.com

Last updated: 5 August 2026