Landlord Gas Safety Certificate-CP12

Ensure your gas safety certificate is completed correctly and professionally.

MML Plumbing trustpilot reviews

Gas Engineer Experts

What We Offer

Prices start from £90 + VAT ( when booked online)
Fixed Price
We strive to provide same-day service to ensure we are with you as quickly as possible.
Only Gas Safe-registered gas engineers only.
All the gas is going to be checked.


Project Finished


Years of experience


New home plumbing installation

What’s included in our CP12 services?

  • Inspection of the boiler, hob or cooker gas)
  • Gas Leak Checks
  • Ventilation Assessment
  • Appliance Performance Testing
  • Safety Device Inspection
  • Issue of Certification

What is not included?

  • Any congestion charges or parking fees
  • Boiler repair or replacement
  • If your appliance fails and requires repair, it’s important to note that the cost of any subsequent inspections is typically not included in the CP12 service.
gas safe

What is the CP12?

A CP12 Gas Safety Certificate is a legally required document that verifies the safety of all gas appliances within a property. It holds significant importance for landlords, particularly those who rent out their properties. Commonly referred to as a “Landlord Gas Safety Certificate,” it provides a comprehensive report outlining the condition of the appliances in the property. Landlords must conduct this annual gas safety check and test annually in every rented property.

To ensure you comply with current gas regulations, we can offer Cp12 throughout the North London area. The certificate will prove your appliances are safe to use.

As a landlord, it is your responsibility to provide gas safety certificates to ensure that the rental house or flat complies with current gas legislation. For landlords, the annual gas safety certificate is mandatory.

This has a legal requirement to be done every 12 months, and your tenant can ask for proof. Also, keep your records for the future.

It is not mandatory to check the tenant’s gas appliance, but it is still the landlord’s responsibility to make sure every gas appliance is working safely.

After the tenant rents your house, a copy of the gas safety certificate needs to be provided to them and kept on the rental property.

Only a gas-safe engineer can carry out the safety checks!

Why do you need a certificate?

Never underestimate the importance of keeping your building and those who live there safe. That is why you have to make sure that all safety regulations are met, including getting a CP12 Certificate on file for any gas appliance in use at your property. The certificate proves that both you as landlord and tenants will be protected.

The local gas engineer will check the boiler and other appliance safety device operations by carrying out a series of tests. If the gas engineer is satisfied with the tests he/she will provide a gas safety certificate.

Unbeatable price with MML Plumbing. Get your certificate today only for just £100+VAT if you book online on demand!

Client Experience


I booked an annual boiler service from MML last week. I couldn’t have been more impressed with Levi’s professionalism and attention to detail. Levi was very polite and took the time to answer all of my questions, explaining every step of the process along the way. He was very thorough in his work and even went above and beyond to ensure that everything was in top working order before he left. I highly recommend Levi to anyone in need of plumbing services – his expertise and customer service truly exceeded my expectations. Thank you Levi for a job well done!

Levi came to our rescue very quickly to change an isolator tap for the dishwasher when we needed to install a new one. He brought the part with him and although the job seemed more time-consuming and complicated than we initially thought, he was very efficient and sorted out the issue promptly. A bonus is that he is a very friendly and kind person too and didn’t mind our dog trying to get involved in the job! Thanks again MML Plumbing for a great service!

Mike (plumber) and Szilvia (admin) were incredibly responsive and helpful when a simple tap replacement became a problem due to the lack of a stop valve in the street and in our house conversion. Mike made 4 visits to resolve the issue
I would always use MML Plumbing and a happy to recommend them

We are a small charity and used MML to have a gas combi-boiler and a totally new heating system fitted. They were brilliant from the beginning. Warm, friendly, helpful and flexible. The engineers have been on time, always arrive when they say they will, and are clear about their availability. They answered my questions and were helpful in making some difficult decisions, by explaining clearly the implications. All this was really good value for money. They were perfect for us.

Very good – easy to book over email, was given a time the same week. The plumber arrived bang on time and was communicative, knowledgeable and friendly. The job was done quickly and to a high standard. Very pleased and will use it again.

We used MML plumbing twice so far, and always received great service and advice from their engineer. Szilvia (the Operation Manager) is wonderfully responsive and squeezed us into the calendar at very short notice when our boiler started acting up. Thank you!

Fantastic service! Our boiler stopped working unexpectedly. MML Plumbing came quickly, diagnosed the problem and resolved it immediately to make sure we weren’t without radiators for too long. Very impressed with the expertise, friendliness and communication. They also gave us tips for maintenance. Highly recommended!

I called MML Plumbing to investigate a boiler fault and they were very helpful and quick to respond. The engineer, Mike, arrived earlier than expected and was friendly and professional. He thoroughly explored the problem(s) and fixed what he could. Unfortunately, it is a problem that the manufacturer will have to deal with (due to the availability of parts). Mike was very honest about this and, here is the amazing part, he did not charge me today as he couldn’t fully resolve the issue! Am so impressed and would not hesitate to call this family business out again.

WOW…. what fantastic service… Levy arrived at the time I was given. He was totally professional, in capping my gas pipe. Unfortunately, he had to remove it all, as the previous engineer left it short! in order for an Induction hob to be fitted. He went above and beyond what he came to do. He also checked my boiler as he was not happy about the pressure.. would definitely use MML again.. and I can highly recommend them.

Did not have a ‘regular’ plumber in north London, so took a punt and mailed a few from Google search. MML came back immediately, great communication, a good price for the work (which was not a simple job) and the engineer was excellent – friendly, professional and super hard working. Three long days for what was hoped to be a two-day job, no moaning when it became more complicated (due to the old system being problematic), definitely recommend it.

They have been absolutely fantastic! responded to my initial, panicked, call!
Levy is professional, quick to source what’s gone wrong and fix it,..also to explain exactly the reasons as to why etc.
We are moving house and certainly didn’t need this worry on top of everything else.MML promptly removed this issue.! We needed to replace a radiator and in a short space of time, Levy not only replaced the radiator but found the right size and style etc; and brought it to us, installed it and had everything sorted in no time!.. he also dismantled a water filter system, we are taking with us, no fuss.. and VERY reasonably priced!.. I would highly recommend their service!’s great to know you have a reliable, professional, friendly plumbing team on your doorstep! Only wish we could take them with us!! Thank you, Levy and team!..Kerry, Keith & Hendrix.


We are very happy with the boiler installation that the gas engineers from MML plumbing did.

The engineers are very polite and hard workers. The office is easy to communicate with.

All I can say is they are very professional.

Amazing service.
MML went above and beyond from the moment of my first enquiry until after the installation of my boiler.
Professional.Great workmanship.
I am now having them back to do other work for me and have recommended it to friends.

Great experience with MML from start to finish! Clear, efficient communication, transparent and reasonable pricing. Our plumber was punctual, professional, kept us informed of our options, and was extremely hardworking. He was even kind enough to manage the situation with our neighbours who were quite annoyed that we had to shut the water off urgently. Our plumber found and repaired a leak in a concrete wall (more complex than expected but it didn’t deter him), fit a new kitchen tap, and even stayed beyond the allotted time to look at our boiler and find a problem with our radiators that we hadn’t noticed. We were really impressed by the efficiency, dedication and level of service. We will recommend MML to others and use them again in the future. PS: At the time of writing, their overall Trustpilot score is only 4/5 whereas all customer reviews have given a 5-star rating. I found this strange when doing research myself and seeing everyone had given them a 5. So remember they’re truly a 5-star plumber, not a 4-star ones!

Prompt and professional, completed boiler service and gave recommendations

Excellent service, really friendly staff and an efficient service completed with care.

When do you need to have the checks carried out?

The law requires landlords to book a gas safety inspection before the rental starts. The landlord gas safety check must be done within one year of starting your tenancy, and you can get more information from the HSE.

The government has set laws around renting homes with gas appliances that everyone should know about. Make sure you do your checks every 12 months in your rented-out property.

7 essential parts that need to be completed on the gas safety certificate:

  1. The engineer’s and company’s name, and Gas Safe Registration Number
  2. The landlord’s name and address (and the managing agency’s details as well)
  3. All of the gas appliances in the property need to have been listed and safety checked, including any that are disconnected.
  4. A gas tightness test has been carried out
  5. The boiler flue gas analysis has to be checked
  6. Also, the gas pressure and gas rate have to be inspected
  7. The date the visit was conducted and the certificate produced
qualified plumber working on a boiler


We are here to serve you. Our MML Plumbing team has the knowledge and experience necessary for carrying out any gas-related work in North London, such as the installation of gas boilers or safety checks. We can carry out gas safety inspections on landlords that will make sure your landlord’s needs are met!

We can carry out a comprehensive safety inspection on landlords that will provide peace of mind that your property is up to the gas regulation.



  • Gas-safe registered Engineers & Company
  • Affordable prices
  • Insured company.
  • Guaranteed workmanship
  • Gas-Plumbing and Heating Services
  • User-friendly booking system
  • 24/7 online support
  • Just to mention a few.
  • Fully qualified in gas, plumbing, and heating.

To keep safe your tenant, property, boiler, and other gas appliances in safe working order, always call us for a check and keep your certificates as a record.

Book your reliable gas-safe registered engineer today in North London!

gas safety certificate
we are gas safe register


It is important to have a valid gas safety certificate when renting out.
If you do not, the results can be serious and include fines of up to £6,000 per breach or 6 months in prison; losing insurance coverage due to non-compliance with regulations. If there is a loss of life the guilty party could be charged with manslaughter.

Frequently Asked Questions

Reliable Gas Engineers

Book your engineer for a gas safety check now!

There are many customer or user-friendly ways to contact us, but the most popular is to fill out our job QUOTATION form, and we will get back to you shortly with our availability.

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