Endorsed by Which?

Certified Group LTD

4.9

133 Reviews

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

Customer reviews

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4.9
133 reviews
Customer Service
4.9
Quality
4.9
Value
4.7
Sort by
Hardworking and thorough.
Customer Service
Quality
Value
Aziz and his team came out after our boiler stopped working properly. They identified serious problems with the previous installation and had to replace it. They were very hardworking, starting early and finishing late, kept the house very tidy and did a thorough job with the installation.
Christopher, London Posted on 18/10/2018 , work completed 18/10/2018
A great service
Customer Service
Quality
Value
Aziz and his team fitted a new boiler in my home this week. They stuck to the agreed price, kept me informed as the work went on, were punctual and left the house spotless every afternoon. All of the team are approachable, polite and clearly well skilled tradesman.
Paul Y Posted on 07/09/2018 , work completed 07/09/2018
Professional and friendly
Customer Service
Quality
Value
A fault with our boiler was diagnosed quickly and a repair was organised. The service was friendly and I was kept informed of what was being done.
Edward, London Posted on 28/07/2018 , work completed 28/07/2018
Shower unit replacement
Customer Service
Quality
Value
The work was completed to agreed schedule and budget. Both engineers were polite and very helpful. They stayed on premises until system was fully replenished and new unit fully tested. Reg carried out an additional investigation with some helpful suggestions on how to resolve an existing issue with getting hot water to the upstairs shower unit. Standard of installation and supplied unit was excellent.
Which? Trusted Traders Consumer Posted on 13/07/2018 , work completed 13/07/2018
These guys are amazing!
Customer Service
Quality
Value
Aziz and his team recently undertook some major work on our home, including the complete removal of existing kitchen and slate floor, installation of underfloor heating, plumbing in of new boiler and relocation and replacement of pipe work throughout our four storey house. They also helped us find a plasterer and painter and managed that work alongside the building and gas works. Everything went very well, and we are thrilled with our new boiler, floor, gas works and kitchen. I felt as though the project and our property was in completely safe hands throughout. They made the whole thing as stress free as possible for us. Aziz was calm and careful throughout and the workmanship was of the very best quality and always undertaken with the utmost care for our home. They were friendly, understanding, nothing was too much trouble. I have absolutely no hesitation in recommending them and will in fact be using them again in the future to renovate our bathrooms. They are a great group of guys, really know their stuff, and are 100% customer focused. Thank you so much Aziz, Kebba and the rest of the team.
AmandaFH Posted on 12/07/2018 , work completed 12/07/2018
Professional and Considerate
Customer Service
Quality
Value
The team replaced our boiler within one working day of viewing the job. They also replaced our water tank, thermostats and some pipe work. They arrived exactly when they said and worked 10 to 11 hour days in order to resolve our heating issues. The team were knowledgeable of their trade and were extremely polite. Thank you Aziz, Kebber and Ken.
SamMoulton Posted on 08/03/2018 , work completed 08/03/2018
Excellent professionals and great people, too!
Customer Service
Quality
Value
When our old boiler broke down just before Xmas and I was in deep distress, Aziz and Kem came to our rescue. With a professional, knowledgeable yet friendly and humane attitude they lost no time in getting to work, after having explained to us all that they were going to do. As the works started, more complications were found than previously anticipated; this did not discourage nor delay them and they kept working hard to sort out the unexpected issues, all this trying to keep their initial promise that my family and I would have a warm house for Xmas. They are tidy, hard-working and trustworthy professionals. It was a pleasure to have them in our house! In the end they did a magnificent job and we are so grateful to Aziz and Kem for all the knowledge, professionalism they put in, but also for their human touch. We will be Certified Gas Heating Ltd's clients for life. Highly highly recommended company!
Barbara T. Posted on 24/12/2017 , work completed 24/12/2017
Boiler Installation
Customer Service
Quality
Value
I had a new boiler installed just under a month ago and am very pleased with the work. It was done ahead of time and on budget, which I was happy with. There were no problems at all and the team were all pleasant to deal with. I would recommend the business to other customers and would use them again.
Happy customer Posted on 20/08/2017 , work completed 20/08/2017
Boiler replacement done well
Customer Service
Quality
Value
We had our boiler replaced by Certified Gas Heating and were happy with the advice, service, time and cleanliness of the work carried out. Happy to recommend.
Trent, London Posted on 21/07/2017 , work completed 21/07/2017
Prompt and professional
Customer Service
Quality
Value
The work was carried out within one day and completed professionally and in a tidy manner.
Guy, Essex Posted on 03/06/2017 , work completed 03/06/2017
High Recommended - fantastic service & work
Customer Service
Quality
Value
I am extremely pleased with the work done by Certified Gas Heating Ltd. I had a lot of trouble finding what I consider a good & reliable plumbing company at affordable prices. Certified Gas Heating ticks all of the above and went been beyond my expectations. I like the "customer centric" service they provide - they listened to me carefully and really paid attention to my issues and expectations while also guiding me and providing me advises to chose a fit for purpose solutions that was cost effective to me (other companies proposed me much different solutions with much more unnecessary building work). They are highly trained professionals who explain very well their work to the customers so we always know what is going on and why. They are extremely reliable and never missed a call back, Email or an appointment. They have a lot of attention for details and therefore did a very good job in the timeline agreed - they also left (everyday) the house in a very cleaned state ensuring all dust, tools, etc. were removed. Finally they had constant care for us as they were regularly asking is we were happy with the work and if they should change anything - this continued after the work was done too. I could not be more happier and will safely keep the company's details in my record as I would not go with another company / professional if I have another job to get done Well done and best wish of success to Aziz and his team Kind regards J
JacquesG Posted on 29/05/2017 , work completed 29/05/2017
Brilliant all round
Customer Service
Quality
Value
From the moment Aziz arrived to have a look at the job to the day he and his team left, the communication, advice, work, cleanliness, timeline were more than expected, great guys have on site. Trustworthy and always happy. Great work. A very happy family.
Hoshang, London Posted on 09/05/2017 , work completed 09/05/2017
Fantastic work
Customer Service
Quality
Value
Pipework is a piece of art! Work is as neat as humanly possible - very happy. Really nice to see tradespeople setting out to please and do a good, thorough job. Much appreciated!
John, London Posted on 31/03/2017 , work completed 31/03/2017
Excellent work.
Customer Service
Quality
Value
This company provides an excellent service. Prompt, efficient, professional, and great customer service. The workmen were friendly and tidied up everything when finished. I can definitely recommend them.
Deborah, London Posted on 12/02/2017 , work completed 12/02/2017
Brilliant job
Customer Service
Quality
Value
I am happy with the work, the pace, the tidiness and the kindness.
Isin, London Posted on 02/02/2017 , work completed 02/02/2017
Thorough, knowledgeable and honest
Customer Service
Quality
Value
Job completed to a high standard by honest, thorough and knowledgeable employees. They were happy to stay long hours until the job was completed and also happy to give unbiased advice. They explained what they were going to do/had done and why at every stage which was much appreciated. Would use again.
Josh, London Posted on 25/01/2017 , work completed 25/01/2017
Professional, Fast and Friendly, (does what it says on the tin & then some)
Customer Service
Quality
Value
Aziz & Dean initially came out and worked on my faulty boiler end of last year and recommended replacing it due to the high cost of repairs. I rang back last week and was told they would be in thursday morning to replace the boiler and might need to finish up on Friday. They came in thursday morning on schedule and worked flat out to get everything installed and cleaned up by Thursday afternoon. Which I really appreciate as I am home with a small child. Aziz even found time to unblock an outside drain he noticed and tidied up the wiring in the kitchen at no extra cost. I would definitely recommend Certified Gas Heating Ltd excellent service
2011-08-09 01:26:13.23 Posted on 23/01/2017 , work completed 23/01/2017
Excellent service and workmanship
Customer Service
Quality
Value
I had my boiler replaced by Azui and the team. They took extra care to fit everything in an unobtrusive way and gave us good advice. I got a few quotes and I found theirs to be very good value. I was also pleased that they were straightforward and found them very trustworthy. Thank you Azui!
Laura, London Posted on 17/01/2017 , work completed 17/01/2017
Brilliant job - Some of the best work seen.
Customer Service
Quality
Value
Aziz and the guys did a fantastic job in installing 9 + 2 rads servicing the boiler & changing the filters. The work is brilliant always had time to answer my questions. So pleased we used Aziz and the team.
Surandra J, Surrey Posted on 16/01/2017 , work completed 16/01/2017
Fantastic job, highly recommended.
Customer Service
Quality
Value
I cannot recommended Certified Gas Heating highly enough. They came to do a few small jobs, and agreed to take a much bigger job when we found we needed it. Their work was excellent, timely and reliable. Communication was excellent throughout. Alfie went well beyond the call of duty. We will be using them again and recommending to others.
Ben, London Posted on 29/12/2016 , work completed 29/12/2016
Really excellent
Customer Service
Quality
Value
Very professional and helpful.
D, London Posted on 15/12/2016 , work completed 15/12/2016
Great job, great people
Customer Service
Quality
Value
I have used Aziz at CGH for at least 2 years. He's one of the few engineers who can deal with a gas tumble dryer. It's always a pleasure to have him in the house. He's polite, friendly, efficient, tidy and hard working. He always goes the extra mile to fit in with our needs. He and his team are great to work with and I highly recommend them.
Sarah, London Posted on 03/08/2016 , work completed 03/08/2016
Prompt & professional
Customer Service
Quality
Value
Aa Work was completed satisfactory. Polite & prompt. would recommend.
Ulrika, London Posted on 31/07/2016 , work completed 31/07/2016
Fantastic
Customer Service
Quality
Value
Very polite and tidy workers. Had new water pipes laid and connected to the mains. Also new water storage tank. They had to break up concrete to lay the pipe and refill in. Work was excellent.
Christine, London Posted on 20/07/2016 , work completed 20/07/2016
Excellent work
Customer Service
Quality
Value
High quality work. Replace central heating system including all pipes and radiators. Work carried out on time and within agreed price. Would not hesitate to recommend this trader to family and friends
Rosella, London Posted on 12/07/2016 , work completed 12/07/2016