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KNJ Roofing offers a wide range of premium roofing systems and services including; roof repairs, maintenance and refurbishments - across Dorset.
Whether you need a minor repair or a full-scale replacement, we work with certified installation professionals to deliver durable and cost-effective results.
We offer a selection of affordable roofing options suited to a range of buildings, including hospitals, healthcare facilities, schools, commercial buildings and residential properties throughout Dorset.
For cases where your roof is beyond simple repair, KNJ Roofing provides comprehensive replacement services. Our package includes an in-depth survey, a tailored specification prepared by our technical team, installation through certified contractors and site inspections conducted by our experienced applications team. Upon completion, you’ll receive a full guarantee and access to dedicated aftercare.
We offer structured maintenance programmes in partnership with our trusted contractors to extend your roof’s lifespan and help you avoid future costly repairs.
At KNJ Roofing, every roofing project begins with a free, no-obligation consultation. This early stage is crucial, helping us understand your exact requirements before any physical work begins.
As part of the site survey, we-
Following the survey, you’ll receive a detailed, custom report outlining the roof’s condition and our recommended next steps. For larger or long-term projects, feasibility studies are also available on request.
Our technical team is happy to join your planning or design meetings at any stage to assist with specification accuracy, ensuring alignment from concept to delivery.
For refurbishment projects involving multiple buildings or large estates, KNJ Roofing can supply advanced roof management tools to help you allocate resources wisely. These tools are designed to help you-
By using a data-backed approach to refurbishment planning, you can avoid reactive repairs and instead create a more structured, long-term maintenance strategy.
Whether you’re maintaining one building or an entire estate, KNJ Roofing delivers expert guidance and reliable flat roofing solutions to keep your Dorset properties protected for the long term.
Flat roofs often come with a reputation for being high-maintenance, but at KNJ Roofing in Dorset, we ensure every new installation is built to stand the test of time. Using premium materials and proven methods, we deliver weather-resistant flat roofs that meet or exceed product guarantees.
As Dorset’s trusted flat roofing experts, we know that meticulous preparation is essential. Every project begins with a full site inspection, allowing us to assess your current roof condition thoroughly. In many cases, a new base layer of 18mm interlocking OSB decking is recommended. Once the foundation is secure, we help you choose the best roofing solution for your needs.
We use high-quality EPDM membrane systems, custom cut in one sheet to eliminate seams and joins. It’s easy to install, highly durable, eco-conscious and offers outstanding value over time.
For long-term performance, our fibreglass flat roof systems use industry-standard GRP materials. These waterproofing solutions are known to outlast their warranties and remain reliable under extreme conditions.
We also provide traditional felt installations. This time-tested approach still serves as a reliable option and all felt roofs installed by KNJ Roofing come with insurance-backed guarantees.
Whether you opt for slate, terracotta or peg tiles, pitched roofing remains a timeless, resilient choice. Natural slates offer exceptional aesthetics and can last for generations, making them a sustainable and attractive option.
We start every pitched roof project with a detailed assessment. Our team inspects the interior (including loft spaces) and exterior for broken tiles, degraded battens or underfelt issues. If a full replacement is needed, we handle every aspect using materials sourced to match-even rarer imports, though some may involve extended lead times.
All pitched roofing work from KNJ Roofing includes an insurance-backed guarantee for complete peace of mind.
We supply and install a wide range of high-quality uPVC soffits and fascias made from weather-resistant materials by top manufacturers. These components are available in standard or vented profiles and can be fitted as full replacements or as durable caps over existing structures, depending on the condition of your roofline.
With UV-resistant finishes to prevent discolouration, our products maintain their appearance over time. We offer a selection of colours and accessories, with all installations carried out by experienced fitters and covered by an insurance-backed guarantee.
Our uPVC guttering is manufactured to high standards and finished with a sleek gloss that complements your roofline. Available in multiple colours and profiles-Round, Square and Ogee-we stock large quantities for fast turnaround.
We assess your current guttering before recommending repairs or replacements. Moss and debris are removed to restore flow and all joints are checked for leaks. If your home uses older imperial-sized guttering, we’ll help you transition to modern metric alternatives to avoid compatibility issues. All new gutter installations are backed by a 10-year insurance-backed warranty.
Full service and workmanship guarantee, let our specialists guide the way.
Extend your roofs lifespan and keep it in the best condition.
Flat roof specialists, years of experience and completed works.
KNJ Roofing was appointed to resolve persistent water ingress at a busy community medical centre in Bournemouth. The issue was compromising several critical internal areas, including a diagnostic imaging suite and outpatient consultation rooms, leading to disruption in patient services.
The existing waterproofing solution-a multi-layered felt system-had deteriorated extensively. Leaks were affecting the operation of sensitive medical equipment and raising health and safety concerns. Adding complexity to the project, the roof supported extensive HVAC and plant equipment, creating numerous intricate detailing points.
Moreover, the client needed a long-term solution that would-
Following a full site survey and moisture mapping assessment, KNJ Roofing proposed a cold-applied liquid waterproofing system ideal for high-detail environments. The specification was tailored to meet NHS hygiene standards and health sector operational requirements.
Key installation details included-
The new waterproofing system was installed on schedule with zero operational downtime for the medical centre. All leak points were sealed, including previously vulnerable flashing areas and joints around rooftop units.
“KNJ Roofing delivered a professional, well-managed service from start to finish. The liquid system has made a visible difference and their team worked considerately around our operational needs. We’re extremely happy with the outcome.”
– Facilities Manager, Dorset Community Medical Centre
✅ No hot works required
✅ Minimal noise and disruption
✅ Precision sealing around complex plant areas
✅ Long-term durability and peace of mind
Whether you need a roof repair, full installation or maintenance service, KNJ Roofing delivers dependable, high-quality roofing solutions tailored to your property in Dorset.
KNJ Roofing brings a wide variety of straight-forward, easy-to-use flat roofing products tailored for all types of repairs and maintenance work in Dorset. Whether you’re tackling a minor patch-up job or planning a full refurbishment, our dedicated support team, online resources and product range are here to make the process easier. From sealing flashings to replacing garage roofing, we provide guidance and the tools you need.
Complete Flat Roof Repair Kits Our specialist flat roof kits use top-grade EPDM rubber membrane, known for its exceptional resilience and waterproofing capabilities. With a life expectancy of over 50 years, these kits are ideal for ensuring lasting performance.
For uneven or detailed roof layouts, liquid roofing systems offer a one-coat solution that self-levels over common roofing surfaces like concrete. These coatings provide rapid, durable sealing with minimal tools.
While EPDM is durable and tear-resistant, damage can occur in extreme conditions. Fortunately, repairs are usually simple. Our repair kits contain everything required to restore damaged areas quickly and efficiently.
KNJ Roofing has partnered with fully trained installers throughout Dorset, so you can benefit from professional-quality application using our trusted materials.
When quick action is required, our emergency PU-based repair product works on a wide range of surfaces-even after rain. Perfect for temporary waterproofing or urgent fixes before planned work.
Prevention Through Inspection Regular visual checks after heavy weather can help you catch problems early. Look for warning signs like standing water, bubbling membranes or cracking seams. Inside your property, watch for damp spots, mildew or musty odours.
Blocked gutters are a frequent cause of roof leaks. Our GutterBrush product prevents debris build-up while allowing water to flow through. It’s available in two common sizes and helps keep drainage systems clear year-round.
KNJ Roofing is proud to support residents and trade professionals across Dorset. We advise on everything from adhesives and membranes to repair tools. Call or chat with us for product advice or guidance on your next project.
Leaks or visible damage can appear without warning. KNJ Roofing offers prompt inspection and repair services to ensure your roof is sealed, secure and performing properly. After a comprehensive survey, we recommend the best solution-whether a targeted repair or full replacement.
For pitched roofs, we inspect internal roofing layers, tile ridges, hips and cement fixings. For flat roofs, we check the surface membrane and decking. Repairs are carried out to exacting standards and all work is backed by our insurance guarantee.
If your roof is significantly deteriorated, we may suggest a new system to restore full functionality and improve energy efficiency.
KNJ Roofing don’t believe in short-term fixes for long-term problems.
✅ Expert help and long-term peace of mind.
📞 Call us today 01202 828 359
📧 Email info@knjroofing.co.uk
