National Roofing & Building LTD
Harpenden, Hertfordshire
Checkatrade member since October 2023
Services
- Dry Rot Treatment
- Woodworm Treatment
- Structural Water Proofing
- Condensation Control
- Mould Control
- Damp Investigation
- Damp Survey
- Timber Treatment
- Rising Damp
- Penetrating Damp Treatment
- Emergency Damp Proofing Service
- Gutter Repair
- Fascia / Soffits Replacement
- UPVC Guttering
- Emergency Fascia / Soffits / Guttering Service
- Fascia / Soffits Repair
- Leadworks Installation
- Flat Roofing Installation
- Pitched Roofing Installation
- Moss Removal
- Roofing Repairs
- Fibre Glass Roofing Installation
- Felt Roofing Installation
- Chimney Cowlings Installation
- Single Ply Membrane Roofs Installation
- Slate / Tiled Roofing Installation
- Slate Roof Installation
- Ridged Tiles Installation
- Dry Verge Installation
- Dry Ridge Installation
- Roof Replacement
- Emergency Roofing Service
- Chimney Cowlings Repair
- Chimneys Repair
- Dry Ridge Repair
- Dry Verge Repair
- Felt Roofing Repair
- Fibre Glass Roofing Repair
- Flat Roofing Repair
- Leadworks Repair
- Pitched Roofing Repair
- Ridged Tiles Repair
- Single Ply Membrane Roofs Repair
- Slate Roofer Repair
Customer Reviews
Write a review9.71 /10
Based on 17 reviews over the past 12 months
Quality of work
9.65
Reliability
9.76
Communication
9.71
Reviews (70)
- Hharry G
10 New roofing
Posted 24 January
Job location: NN5Tom was brilliant to work with. Him and his team did a fantastic job on my roof and completed in good time and left everything nice and clean. I would highly recommend National roofing and building. 10/10 workmanship. 10 New roof
Posted 21 January
Having suffered with damp in our first floor rooms, we found that we were in need of a new roof . National Roofing were thoroughly professional from the start. They explained everything clearly at every stage, were very prompt and worked diligently. We are looking forward to reaping the benefits over the coming years.Verified reviewerJob location: NN99 New roof
Posted 20 January
We had a new roof installed to a great standard . Tom was very helpful and his team were very efficient and tidy.unfortunately the flu for the central heating boiler was distrured and we had a week or so of condensation going into the loft space which soaked a lot insulation. Fortunate I had a look into loft space shortly after completion of work. Easy fix and soon dried . Overall experience very good.Verified reviewerJob location: NN1110 Excellent roofing
Posted 18 January
Job location: NN11Asked Tom to have look at my roof when they were working nearby He had a look shared photos etc with me and we agreed price work carried out quickly and to a good standard- JJonathan M
10 Roof renewed
Posted 17 January
Identified an issue with damp in bedroom. Closer examination showed the felt had not been installed correctly and roof tiles needed replacing. Scaffolding went up the next day and Tom quickly mobilised a team of 7 to install new membrane and roof tiles. All completed in 2 days, despite horrendous weather, and the roof looks like new.Verified reviewerJob location: MK45 10 Very efficient and reliable
Posted 18 November 2025
Used National roofing to replace my main roof in my house and then decided to have both roofs on my extensions replaced. As with the first the company turned up and completed the work with efficiancy and care. They also tidied up after them. I would recommend to anyone.Verified reviewerJob location: LU7
Photos
Company Info
Owner
Mr Thomas Mongan
Ltd Company
3 years on Checkatrade
VAT Registered
Yes: 491634277
Hello I am Thomas , the proud owner of National Roofing and Building, LTD
A little bit About National Roofing & Building LTD
Welcome to National Roofing & Building Limited the top roofing company in Hertfordshire ,and North west London providing exceptional roof repair services for residential and commercial properties. We understand that a damaged roof can cause significant stress and inconvenience, which is why our team of experienced professionals is dedicated to delivering fast, efficient and reliable solutions.
Our range of services includes roof repairs, replacements, installations, and maintenance. We use only the best quality materials and techniques to ensure that your roof is durable and long-lasting. Our team is equipped with the latest tools and equipment to provide a quick and efficient service, and we always strive to complete the job on time and within budget.
If you have noticed any issues with your roof, such as leaks, damage or wear and tear, don’t wait until it’s too late. Contact us today for a free consultation and let us take care of all your roofing needs. Our friendly and knowledgeable team will be happy to answer any questions you may have and provide you with a tailored solution to meet your specific requirements.
At National Roofing & Building Limited, we are committed to providing our clients with the highest quality of service and workmanship. Our focus is on customer satisfaction, and we take pride in the fact that much of our business comes from referrals and repeat customers. Let us help you protect your property and ensure that your roof is in top condition for years to come.
Main work we undertake
Roofing ,Flat Roof’s, Re-pointing, Guttering and all other aspects of roof lining
Availability
We are always contactable via phone throughout the week, and Saturday until 4pm
If for any reason you are unable to get through to us please leave me a message and a colleague will get right back to you.
(Please leave your phone number in the voicemail)
Thank you for taking the time to consider our company’s profile, I look forward to hearing from you.
National Roofing & Building LTD
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Member since October 2023
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