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Endorsed by Which? Trusted Traders

JPM Independent Surveyors

Profile thumb jpm

61 Reviews

Opening Hours
Today - 08:00–18:00
  • Monday 08:00–18:00
  • Tuesday 08:00–18:00
  • Wednesday 08:00–18:00
  • Thursday 08:00–18:00
  • Friday 08:00–18:00
  • Saturday 08:00–18:00
  • Sunday 08:00–18:00

What is a Which? Trusted Traders Islington Trading Standards Approved Endorsement?

Which? Trusted Traders has partnered with Islington Trading Standards to create an Islington Trading Standards Approved endorsement. In addition to our standard trading standards assessment, this trader has had a DBS check and is subject to a Trading Standards intelligence check.


I provide specialist damp investigation and timber reports with solutions to fix the problems.

Dampness is often misdiagnosed by contractors.
Quite often the correct solution is simple and inexpensive.


I am not a contractor, I am a surveyor. I do not carry out remedial damp proofing or building works so you can rest assured that my reports are competently impartial.

Experienced qualified independent damp and timber surveyor.
: Dampness
: Condensation
: Mould
: Timber decay
: Woodworm
: Ventilation

CSRT Qualified.
Property Care Association.
Expert Witness Institute.
PCA Qualified Technician in Structural Waterproofing.

20+ years experience and fully insured, I provide for home owners, tenants, estate agents, landlords, architects and property pre-purchase.

Covering areas of North London, East London and West Essex.

What we do

  • Damp proofing and timber preservation services

    • Condensation and humidification control
    • Timber treatment services
    • Woodworm treatment
    • Injection damp courses
  • Mould

    • Mould investigation
    • Mould survey
  • Surveyors

    • Building Surveyors
    • Damp proofing surveyors
  • Builders

  • Specialised building trade contractors

  • More Services

    • independent
    • timber
    • rot
    • water damage

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.

61 reviews
Customer Service
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Thorough survey and report, very happy
Customer Service
My flat has some significant damp issues which has led to deteriorating plasterwork in 2 areas and I arranged for Jason Mahoney to conduct a damp survey on 29 April. Jason arrived on time and carried out a very thorough survey through the whole flat and the exterior. He was very knowledgeable and professional, asking me questions and explaining what he was finding as he went along. He then sent me a very detailed report the following day on his findings and some really helpful suggestions for repair of external walls, alternatives for damp proofing the badly affected interior walls and mitigation of water vapour and condensation. This has been a very valuable experience and I would happily recommend Jason to anyone who needs a damp survey carried out. Jason's work has potentially saved me many hundreds of pounds of unnecessary damp proofing work.
Customer in Greater London Posted on 05/05/2021 , work completed 30/04/2021
Professional, detailed and clear damp report
Customer Service
We contacted Jason based on the reviews on Which Trusted Trader as well as the credentials listed on his website (PCA member, CSRT Qualified, Approved by Islington Trading Standards). We had previously been disappointed by a local "damp proof specialist", who's report involved looking around only part of the property for 10 minutes. Jason not only carried out a detailed investigation, including taking moisture readings and testing extractor fan flow rates, but also compiled a thorough yet easy to understand report with clear recommendations. Very impressed.
Customer in Greater London Posted on 09/04/2021 , work completed 09/03/2021
One of best decisions we made
Customer Service
We have just moved into our new house. Our homebuyer's survey had brought up a few damp spots to be further investigated, but nothing major. So I called a few people to take a look. I got the usual quickfire diagnoses that all the issues were caused by rising damp which would naturally mean boring holes all the way around the entire house to inject damp proof courses for hefty fees. I felt I wasn't well-informed enough to make the decision on what to do. It wasn't the costs as much, more I wanted to be confident that I was making the right decision. After looking into things properly I felt the only way to go was an independent survey by an expert. I came across Jason and JPM. From the first email communication, Jason was friendly, courteous and super-efficient. When he arrived, he conducted his survey and we spoke afterwards. His expert knowledge really was a joy to receive because he explains things so clearly. His report too is clear and concise and informs you of what needs doing and also gives a nod to what else would be prudent to do. My advice is to book Jason so that you are armed with all the information you need to conduct any work that actually needs doing. Having Jason's report gives you the power back. At my house, Jason found a localised penetrating damp spot which I could just fix myself at a very low cost. After analysing samples from my walls for ground salts, there wasn't even any rising damp. Must admit I'm rather proud of myself for making such a wise decision!
Customer in Greater London Posted on 29/03/2021 , work completed 25/03/2021
Extremely good report and quick!
Customer Service
Jason provided a thorough, clear report which explained all of the problems in layman's terms. It was thorough, easy to read and with images throughout. It has everything I need to instruct a builder to take out the works. The report was provided within hours of the survey taking place, he was easy to communicate with and good value for money. Would definitely recommend.
Customer in Greater London Posted on 22/02/2021 , work completed 22/02/2021
Top class damp surveyor
Customer Service
Jason was able to rearrange on short notice due to a mess up from my estate agent. He was extremely knowledgable and thorough in his search and provided clear communication around the damp causes and solutions to fix these. I would 100% recommend getting an independent damp survey from Jason if you have been told you have damp. I was quoted five times the amount I should be spending on damp treatment by cowboy "damp specialists" offering a free survey. Definitely use a surveyor that is not connected to any contractors, saves money and time in the long run.
Customer in Greater London Posted on 16/12/2020 , work completed 16/12/2020
Excellent service
Customer Service
Excellent service from Jason/JPM Independent Surveyors. Having had 3 different contractors look at my property and each come up with a different schedule of works and varying costs, I contacted JPM online to arrange an independent survey (I wish I had done this to begin with). Jason responded to my initial enquiry very quickly with plenty of information about JPM and the service offered. Jason arrived promptly for our survey appointment (with facemask, shoe coverings, gloves) was professional, courteous and helpful during the survey. We received the survey report promptly after the visit, it was thorough included photographs, yet is straightforward and easy to understand. Highly recommend.
Customer in Greater London Posted on 14/12/2020 , work completed 07/12/2020
Highly professional and detailed service
Customer Service
Jason was incredibly helpful both when requesting information about his services and explaining the final report. He answered all my questions with detailed answers and fast-tracked the report getting it to me several days ahead of expectation.
Customer in Greater London Posted on 10/12/2020 , work completed 07/12/2020
Professional, thorough and reassuring recommendations
Customer Service
I contacted Jason to complete a damp survey and give us a second opinion following a very scary quote we received from a so called "damp expert company" which recommended us to damp proof all rooms for the cost of 60,000 pounds!!!! We had just bought the flat less than 3 months prior and during our general building survey as part of the purchase process, no damp had been identified so we were terrified with this quote and the huge work recommended!. Since the same company who completed the "assessment" would also carry out the work, we decided to get an independent second opinion by a trusted person registered with PCA. I am so happy that we found Jason from JPM Independent Surveyours. He was professional from start to end completing a thorough investigation, explaining the process and then advising of achievable life style and other affordable recommendations. His verbal recommendations at the end of the survey were followed by a clear report at the end of the same day I would higly recommend Jason to anyone that having discovered condensation and mould in their house want to understand the cause of these and receive trusted and effective recommendations so that it does not spread and deteriorate further.
Customer in Greater London Posted on 03/12/2020 , work completed 03/12/2020
Detailed damp survey, easily contactable and great advice
Customer Service
I hired Jason for a damp survey on a property I suspected there was damp in. Jason gave very quick responses and acted in a professional manner. If there were any emergency issues with the booking, he would let me know immediately and suggest alternative times which was very impressive. He turned around the report in a short amount of time and gave detailed advice to me to fix particular issues as well as advise on how to look after the property and prevent damp. Would highly recommend to anyone looking for a surveyor. One of the most professional experiences and would certainly use again in future when required. Thanks Jason.
H in Greater London Posted on 13/11/2020 , work completed 12/11/2020
Excellent service, highly recommended.
Customer Service
We have had an offer accepted on a property and asked Jason to do a damp and timber inspection for us. From the first communication Jason was extremely responsive and was even willing to offer weekend dates to accommodate our timelines. He inspected the property and produced a highly thorough and professional report on the same day. He noted all issues identified and helped us prioritise what to fix based on the severity of the defects. After submitting the report, Jason continued to respond to all our follow-up questions in a very timely manner. Couldn't be happier with the service, we highly recommend JPM.
Customer in Greater London Posted on 28/10/2020 , work completed 26/10/2020