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Black Mammoth Plumbing and Heating Ltd

9.86/10

London

Checkatrade member since November 2022

Accepts Checkatrade Pay

We guarantee the work for up to £1,000 for 12 months. T&Cs apply

Customer Reviews

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9.86 /10

Based on 32 reviews over the past 12 months

Quality of work

9.75

Reliability

9.94

Communication

9.75

What customers are saying

AI-generated from customer reviews over last 24 months

Slava is highly praised for his promptness, professionalism, clear communication, and efficient work, often going above and beyond to ensure customer satisfaction. Customers appreciate his tidiness and fair pricing, though one customer noted a minor issue with thoroughness on a radiator installation.

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Reviews (68)

  • 10

    Boiler Replacement

    Posted 02 June

    Slava was excellent, quick to respond, communicative, explained several options and was very clean
    Verified reviewer
    Job location: SW13
  • 10

    Fixed our hot water

    Posted 19 May

    Had Slava come out and fix our hot water for us. He was really nice and sorted the problem out really quickly, will be calling on him again in the future.
    Verified reviewer
    Job location: SW19

    Response from Black Mammoth Plumbing and Heating Ltd

    Thank you for your kind review – I really appreciate you taking the time to share your experience!

  • 10

    Unvented hot water cylinder installation

    Posted 11 May

    I recently had a hot water cylinder installed, and I couldn’t be more pleased with the service. Slava was professional, punctual, and extremely knowledgeable. The installation was completed efficiently and to a high standard. He took the time to explain everything clearly and made sure everything was working perfectly before leaving. I would definitely recommend him to anyone needing plumbing or installation work. Great job!
    Verified reviewer
    Job location: UB7

    Response from Black Mammoth Plumbing and Heating Ltd

    Thank you for your kind review – I really appreciate you taking the time to share your experience!

  • 10

    Change of Thermostat Cartridge

    Posted 24 April

    Slava reached out to me promptly for appointment, he came to check the issue and performed a proficiency assessment. Offer solution by replacing the cartridge and got part very quick to catch up my schedule.
    Job location: SW20

    Response from Black Mammoth Plumbing and Heating Ltd

    Thank you for your kind review – I really appreciate you taking the time to share your experience!

  • 9.33

    Investigating/fixing a leak related to unvented cylinder

    Posted 02 April

    Slava communicated well and did everything he could to find the right solution for our problem. It was a complicated situation and he could have easily extended the work, but he was honest and found the cheapest/best solution for us.
    Verified reviewer
    Job location: CR0

    Response from Black Mammoth Plumbing and Heating Ltd

    Thank you for your kind review – I really appreciate you taking the time to share your experience!

  • 10

    Boiler service

    Posted 27 February

    I had a boiler service and leak check, and I was thoroughly impressed with the experience. The plumber was reliable, professional, and skilled, taking the time to provide a detailed diagnosis of the system. They spent extra time diagnosing the possible source of the leak, ensuring no issue went unnoticed. Very attentive, they checked in to make sure everything was working perfectly. The service was thorough, efficient, and the plumber worked hard throughout. Additionally, they were personable and had a pleasant manner, making the entire process smooth, stress-free and cost-effective.
    Job location: SW16

    Response from Black Mammoth Plumbing and Heating Ltd

    Thank you for your kind review – I really appreciate you taking the time to share your experience!

Photos

Company Info

Owner

Mr Viaceslav Mamontov

Ltd Company

3 years on Checkatrade

VAT Registered

No

Domestic WorkCommercial WorkCards AcceptedInsurance Work Undertaken24 Hour Call-outFree Estimates

We are a trusted, local plumbing company based in South West London, committed to delivering the highest quality service with a seamless and stress-free experience. Whether you need expert plumbing, boiler servicing, central heating repairs, or waste system installations, we bring a detail-oriented, customer-first approach to every job.


With over 10 years of hands-on experience in domestic and light commercial work, I am a fully qualified Gas Safe registered engineer, holding WRAS certification and a Level 3 Diploma in Plumbing and Domestic Heating (City & Guilds). My services cover everything from routine maintenance and landlord safety checks to emergency plumbing call-outs and fault diagnostics. I am fully insured and compliant with the latest building and gas safety regulations.


We pride ourselves on punctuality, transparency, and workmanship that stands the test of time—earning the trust of homeowners, landlords, and property managers across South West London.

Accreditations and awards

CITY & GUILDS
CITY & GUILDS
bpec Certification Ltd
bpec Certification Ltd

This trade passed up to 12 Checkatrade vetting checks

Member since 2022

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