Gas safety certificate
£80
Up to two gas appliances, usually the boiler and the hob or cooker.
- Safety check of each appliance and its flue
- Landlord Gas Safety Record emailed the same day
- Each extra appliance £30
CP12 for rented homes
Landlord gas safety certificates in South London
A Gas Safe registered engineer checks each gas appliance and flue you provide for your tenants, then emails your Landlord Gas Safety Record the same day. The certificate is £80 for up to two appliances, usually the boiler and the hob or cooker, and £30 for each one after that.
- Gas Safe registered 916923
- Rated 5.0 on Google
- No deposit to book
Prices, VAT included
- Certificate, up to two appliances
- £80
- Each extra appliance
- £30
- Certificate and basic boiler service
- £180
- Certificate and full boiler service
- £280
Repairs and parts are not included. If something needs fixing, you get a price before any work starts.
What the gas safety check covers
The engineer checks each gas appliance and flue that you provide for your tenants. The Gas Safety (Installation and Use) Regulations 1998 set out what has to be examined on every one:
- The flue
- That it carries the fumes from burning gas safely out of the home.
- The air supply
- That the appliance gets the air it needs to burn gas properly.
- Pressure and heat input
- That the appliance burns gas at the rate it was designed for.
- Safe operation
- That it works safely, including the devices that shut it down when something goes wrong.
What you receive
The Landlord Gas Safety Record, still widely called the CP12, emailed the same day. It lists each appliance and flue checked and where it is, any safety defect found and what was done about it, and the engineer's name and Gas Safe registration number.
The £80 covers the first two appliances. Each further appliance, such as a gas fire or a second hob, is £30. Repairs, parts and boiler servicing cost extra.
A safety check is not a service
The check confirms each appliance was safe to use on the day. It doesn't clean or maintain anything. A boiler service is the maintenance: the boiler is cleaned and tested so it keeps running well. HSE advises landlords not to treat either one as a substitute for the other, so both can be done on the same visit for less.
Prices and service bundles
Fixed prices, VAT included, agreed before the visit. Adding the annual boiler service to the certificate visit costs less than booking it separately and saves arranging a second appointment.
Certificate and basic boiler service
£180
The service adds £100, which is £20 less than booking it on its own.
- All safety checks
- Gas tightness test
- Flue gas analyser
- Controls check and system
- Condensate trap clean
- Magnetic filter cleaned
- Expansion vessel checked & recharged
- Service record filled and supplied digital
Certificate and full boiler service
£280
The service adds £200, £20 less than on its own. Everything in the basic service, plus:
- Main heat exchanger fully stripped and cleaned
- Replaced seals
- Replaced electrodes
- All genuine manufacturers parts
A service bundle covers one boiler, and online booking covers 1 to 10 appliances. For anything larger, call 0208 226 0205. Full details of both service levels are on the boiler service page.
How booking works
Book online in four steps, or call if you would rather talk it through.
Step 1
Choose the certificate
The booking button opens the booking form with the gas safety certificate already selected. Add the property postcode.
Step 2
Count the gas appliances
Enter the boilers, hobs, cookers and gas fires at the property. The first two are included and the price updates as you go. This is also where to add a basic or full boiler service, and to note anything the engineer should know, such as who will let them in.
Step 3
Pick a date and arrival window
Choose an available date, then a morning or afternoon arrival window. You can ask for a preferred time; it is a request rather than a promise.
Step 4
Add your details and confirm
There is no deposit and no payment step. You get a booking reference on screen, then a confirmation email, and the engineer texts 30 to 60 minutes before arriving.
Your duties as a landlord
The main gas safety rules for rented homes, in brief, with links to the official guidance.
- Have every gas appliance and flue you provide for tenants checked every 12 months by a Gas Safe registered engineer.
- Give existing tenants a copy of the record within 28 days of the check, and new tenants a copy before they move in.
- Keep each record for at least two years.
- Keep the gas pipework, appliances and flues you provide in a safe condition. The annual check alone is not maintenance.
- Appliances your tenants own are their responsibility, but you remain responsible for parts of the pipework and installation that serve them.
- You can have the check done up to two months before it is due and keep the original renewal date.
- In England, any room used as living accommodation that has a fixed combustion appliance, other than a gas cooker, needs a carbon monoxide alarm.
Summarised from HSE guidance, checked October 2026. Read HSE's gas safety guidance for landlords and its page on gas safety records, or the CP12 guide for London landlords for more background.
Areas covered
InstaGasWorks works across South London from a base on Mitcham Lane in Streatham. If your property is outside these areas, call 0208 226 0205 before booking to check.
Battersea · Putney · Balham · Tooting · Wandsworth · Clapham · Streatham · Wimbledon · Colliers Wood · Morden · Dulwich · Croydon · Thornton Heath · Norbury · Sutton · Mitcham · Carshalton · Wallington · All areas covered
Who carries out the check
InstaGasWorks is Christopher's own business, so the Gas Safe registered engineer you book is the one who visits. Registration number 916923, which you can check on the Gas Safe Register.
More about InstaGasWorksReviews
What customers say after a visit
5.0on Google
Every review here is a real one from the InstaGasWorks Google listing, so each can be checked at the source.
“I can't recommend Chris at Instagasworks highly enough. Over the course of a week he resolved a high pressure issue on my boiler which had been ongoing for over a month. He explained everything really clearly and dealt with the issue with integrity, which involved replacing a heat exchange plate. I never got the impression he was trying to rip me off and his prices are fair and competitive. My boiler is located in an awkward location but he worked with me to ensure he could complete the work, and I'll definitely be using his services in the future.”
“Excellent service. Efficient and reliable. Chris has a great manner in the way of explaining what needs to be done and how he will do it. No hesitation in recommending Instagasworks and I will contact again if needed in the future.”
“Chris is kind and helpful. He is quick to respond and goes above and beyond to help.”
“Instagasworks Plumbing and Heating. This is the most competent and efficient company with regard to the installation and maintenance of heating systems that I have ever come across.”
“Amazing customer service, Chris goes over and beyond!”
“Amazing service, friendly and very hardworking.”
Gas safety certificate questions
What is included, what costs extra and what happens on the day. For the wider rules, read the CP12 guide.
Book your next gas safety check
£80 for up to two appliances, the record emailed the same day, and no deposit to book.