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Endorsed by Which?
Certified Group LTD
Opening Hours
Today - 24 hours
- Monday - 24 hours
- Tuesday - 24 hours
- Wednesday - 24 hours
- Thursday - 24 hours
- Friday - 24 hours
- Saturday - 24 hours
- Sunday - 24 hours
About
Welcome to Certified Group Limited,
Affiliated with Certified Gas Heating Limited.
Established in 2012, A fast-growing company with an impressive reputation accommodating your plumbing, heating and gas constructively. Over the recent years we have started to offer additional services which include: Electrical, renewables, drainage, carpentry, roofing, property renovations, Loft conversions and kitchen extensions, thus the reason for the name change as it fits our image at present. We at Certified Group are known for being passionate, driven, professional and organised tradesmen at all times. We are approved contractors rated a “5 Star company for quality services” on platforms such as Which Trusted Trader, Trust Pilot and Checkatrade etc.
Ourselves at Certified group have a remarkable track record for our hard work, performance, quality, customer service and efficiency.We are based in Greenwich/London as well as Dartford/Kent and we cover the whole of the capital including the surrounding areas.
What we do
Heating contractors
- Central heating systems (installation and servicing)
- Immersion Heaters
- Automated Heating
Plumbers
- Emergency plumbing services
- Unvented cylinder installation and maintenance
- Water softener installation and maintenance
Boiler, central heating and gas engineers
- Boiler installation
- Boiler repair
- Boiler servicing
- Radiators and central heating
- Gas cooker installation
- Gas cooker repair
- Gas emergencies
- Gas fire repair and servicing
- Gas safety testing and inspection
- Immersion Heaters
- Power flushing
- Underfloor heating
Gas installers
- Gas Fires
Builders
- Extensions
- Garage conversions
- Loft conversions
- Plastering
Electricians
- Electric Showers
- Electrical emergency services
- Electrical installations
- Electrical repairs
- Electrical testing services
- Landlord safety certificates
- Fuse boards
- Outdoor electrical wiring
- Rewiring
Drain clearance contractors
- Blocked drains
- Drain and sewer services
- CCTV drain surveys
- Drain installation
- Emergency drain clearance service
Property refurbishment contractors
Building construction contractors
- Basement Waterproofing
- Basement conversion
- Building construction management
Bathroom fitters
- Accessible bathrooms and showers
- Wet rooms
- Electric Showers
- Bathroom Installation
- Bathroom design services
- Bathroom refurbishment
- Bathroom suppliers
- Bathroom tiling
Kitchen fitters
- Kitchen design
- Kitchen installation
- Kitchen refurbishment
- Kitchen tiling
- Kitchen worktops
- Granite Worktops
Carpenters
- Joinery and carpentry
Tile fitters and showrooms
- Bathroom tiling
- Floor tiling
- Kitchen tiling
Roofers
- Flat roofing
- Roof and skylights
Glaziers
- Double glazed units
- Double glazing installation
- Aluminium Windows
- Double glazing repair
- Glass boarding up and replacement
- Replacement window services and repairs
- Sash windows
- UPVC Windows
- Timber windows
- Triple Glazing
- Velux windows
- Window consultants
Doors
- Bi-fold doors
- Composite doors
- Door repairs
- French doors
- Front door
- Patio doors
- Timber doors
- UPVC doors
- Aluminium doors
More Services
- re-roofing
- roof refurbishment
My work
Customer reviews
Why you can trust these reviews
All reviews are verified as being genuine and a true customer of this trader.
How can we be so sure?
100% of the reviews we publish have been through our stringent moderation process.
4.9
138 reviews
Recommended
Recommended
by 99% of customers
Sort by
1st class service.
Customer Service
Quality
Value
Professional, pleasant, wore overshoes without being asked. No mess whatsoever. Aziz & Keeba. Thanks
Paul, London
, work completed
Recommended
Great job!
Customer Service
Quality
Value
Having been let down by another plumber Aziz did a fantastic job - coming out at the weekend to do the job. Lovely guy, quality job & fair price considering it was a weekend. Would definitely use him again!
Customer in Greater London
, work completed
Recommended
Excellent, quick service from the company.
Customer Service
Quality
Value
The team for Certified were excellent as ever. Quick, efficient - they worked incredibly hard to put in a new boiler at short notice and at a busy time of year. I trust team, and will continue to use team.
Ben, London
, work completed
Recommended
Thorough & professional.
Customer Service
Quality
Value
Certified Gas Heating Ltd worked long hours to get the job done at short notice. Their work was thorough and professional, the team was helpful and friendly.
Josh, London
, work completed
Recommended
First class work and service
Customer Service
Quality
Value
Aziz was just brilliant in every way. He was courteous, professional, hard working and reliable, as well as being friendly and very customer focussed. He spotted and sorted out some issues left by the installers of the old boiler, and he kept me completely informed about his progress. He was also faultlessly tidy and left everything in ship shape order. He kept his promises, deserved my trust in him and took all the potential stress out of the process. I can't recommend him and his company more highly. I found his company via Which? Trusted Traders and wondered if all the glowing reviews could be true. They are!
Customer in Greater London
, work completed
Recommended
Boiler and gas pipe replacement
Customer Service
Quality
Value
Work carried out - see above. The trader reacted to an emergency callout which I had posted on the Vaillant website. He called me back the same morning and gave a quote. He advised me on gas safety which required pipes to be filled from the meter to the boiler, additional to the boiler fitting itself. The trader was reliable and helpful and carried out a good and professional job.
Cordula, London
, work completed
Recommended
New gas central heating, boiler & radiators
Customer Service
Quality
Value
Aziz, Kam and Kips were excellent. They recommend the best solution for my property and worked tirelessly to get it completed. You could tell the quality of their work was high. Copper pipes were all chased into the floors and the gas pipe into the wall. Kam spent most of the time on site and works like a machine to get the job done. The guys always cleaned up at the end of the day. I would highly recommend them.
Lloyd
, work completed
Recommended
Professional reliable service
Customer Service
Quality
Value
Aziz provided a quote within a few hours of diagnosing the issue with the boiler. Once quote was agreed, the replacement boiler was ordered and work commenced on the next business day. Service was very quick, professional and at all times both the tenant and the landlord was kept informed. The work was completed on time and within the agreed price. I have no reservations in recommending Aziz!
Customer in Westcombe Park
, work completed
Recommended
Gas pipe replacement
Customer Service
Quality
Value
Aziz and Kam did an amazing job for us replacing a gas pipe due to a leak that had appeared under our kitchen floor, and re-fitting a gas fire that had not been put in properly by another trader. They were able to start in just a couple of days. They worked solidly for the whole day, from 9am until 10pm. They reassured us about the work they were doing and explained everything in simple terms. Throughout the day they kept us updated on the very thorough testing they performed on the work. All of the pipework was done incredibly neatly, and when the work was finished they ensured everything was clean and tidy before. Incredibly friendly and hard working guys. Will certainly use CGH again in the future if any more work needs doing.
Customer in Lewisham
, work completed
Recommended
Fantastic job
Customer Service
Quality
Value
Very professional, tidy and friendly. Very flexible and willing to start quickly.
Livia, London
, work completed
Recommended
Ex-member of British Foreign Office.
Customer Service
Quality
Value
My central heating system was originally installed in late 1972. It covers 4 floors of a late 17th century house. Over the years - and our frequent absences - it has declined and needed replacement by a modern system. The new system is now in place. It is now fully up-to-date and I am very happy with the work which has been done.
Michael, London
, work completed
Recommended
Highly recommend, very efficient
Customer Service
Quality
Value
Fixed a huge plumbing situation which took a day. They worked non-stop with total efficiently, professionalism and integrity. Excellent communication and great people.
Priya, London
, work completed
Recommended
Professional, excellent service
Customer Service
Quality
Value
Very helpful and kept me informed throughout the service
Sofia, London
, work completed
Recommended
Very professional, great workmanship
Customer Service
Quality
Value
Two workers replaced the boiler and rerouted much of the piping for heating and water. Very hard-working, friendly and professional service and work. Worked very hard top meet agreed 3 day schedule and took time to help understand work being performed. Would definitely recommend
Dan, London
, work completed
Recommended
Considerate & helpful
Customer Service
Quality
Value
Our boiler stopped working on a bank holiday. Aziz attended to diagnose the fault within 2 hours and returned the next working day to install a new boiler. He was very knowledgeable, punctual and tidy and his team were very considerate while on the property. The price was reasonable and were were very happy with the work.
Jacqui, London
, work completed
Recommended
Professional and give good advice
Customer Service
Quality
Value
Asif and his team gave me good advice regarding my broken down boiler. He identified the possible solutions and we decided to replace our boiler. He came back and fixed it in a day (Sunday!) I greatly appreciate his urgency.
Andrew, London
, work completed
Recommended
My review
Customer Service
Quality
Value
Reliable and quality work very reliable - come on time and serviced my boiler at perfect.
Massimo, London
, work completed
Recommended
Professional and friendly
Customer Service
Quality
Value
Everything went well, from the initial quote to the completion of the work. I shall be recommending them widely.
Peter, London
, work completed
Recommended
Excellent and professional
Customer Service
Quality
Value
Install a new boiler - very professional, worked efficiently as a team of 3 - kept us informed throughout, very efficient and polite. Excellent job.
William, Surrey
, work completed
Recommended
Both prompt and professional.
Customer Service
Quality
Value
Fixed leaking pipe, replaced ceiling and boiler. Schedule was very quick, service clean and professional.
Will, London
, work completed
Recommended
Very respectful
Customer Service
Quality
Value
Replace boiler and flush radiators. Very respectful and clean.
Lisal, London
, work completed
Recommended
Highly recommended! A company that won't let you down
Customer Service
Quality
Value
This is a great company that I've come to trust implicitly. Formed by highly competent gas engineers/workers who will carry out the job in question within the time and cost estimate and keeping your house as clean and tidy as possible whilst doing the job. It is always a pleasure to have one of their representatives in my house as I know the job will be done properly, quickly and safely. Highly recommended! Do give them a try, you won't regret it.
Customer in Greater London
, work completed
Recommended
Amazing work!!!
Customer Service
Quality
Value
Aziz, Keeba and his whole team were very professional from the beginning, they are one of the most brilliant tradesmen that i have come across. They were punctual, polite and very tidy (which is very rare in a tradesmen). I am so glad I came across certified gas heating ltd and I recommend them to all my family and friends. They completed a full house renovation and I couldn’t be happier with the work that they carried out. They listened to every details that I mentioned and they took it in to consideration. I will definitely be using Aziz and him team again in the near future. I recommend these lovely boys to everyone, you will not be disappointed.
Customer in Greater London
, work completed
Recommended
Superb service work.
Customer Service
Quality
Value
This was an outstanding piece of work. Excellent advice, superb installation, workmanship, professionalism and preparation and clearing up. I feel very confident in the work & service. Would recommend this company and team as excellent with great confidence.
Griselda, London
, work completed
Recommended
Boiler replacement
Customer Service
Quality
Value
Installed a new boiler work done satisfactory and very helpful and courteous and cleaned up afterwards, would recommend to anyone and the best.
Ken, London
, work completed
Recommended