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Building Envelope Specialists

Thornton is a specialist contractor and fabricator of roofing, cladding and glazing systems.

Our Services
Belfast Grand Central Station
Belfast Harbour Studios, Phase 2
The Edge PBSA, 48-52 York St
The Marcus Hotel

60 years building the skyline.
Northern Ireland’s
trusted envelope experts.

Trusted by

Aidan Gilmore

Project Supervisor at Choice Services

“Thornton Roofing has delivered on all our requirements in a very satisfactory timeline.”

“We have worked with Thornton Roofing for the last five years on our specialist roofing works. A lot of our work is response repairs, and Thornton Roofing has delivered on all our requirements in a very satisfactory timeline.

“We have had larger projects which have needed to be planned out, and we have found Thornton Roofing to be flexible with our needs, with an eye on delivering the project.

“Thornton Roofing are always safety conscious and has supplied us with all the necessary Health and Safety Rams required to proceed with a safe working environment for all. I can conclude that it has been a pleasure to work with the team at Thornton Roofing. “

Duane McCredie

Project Director at Farrans/Sacyr JV

“Their team exhibited exceptional professionalism, ensuring that all works were carried out to the highest industry standards, on programme, and in full compliance with safety and quality requirements.”

“Thornton Roofing delivered an exemplary service on the Grand Central Station Kalzip roofing project. The scope and complexity of the installation demanded a high level of technical expertise, meticulous planning, and disciplined execution. Thornton Roofing consistently demonstrated these qualities throughout the project.

“Their team exhibited exceptional professionalism, ensuring that all works were carried out to the highest industry standards, on programme, and in full compliance with safety and quality requirements. The collaborative approach adopted by Thornton Roofing contributed significantly to the successful delivery of this high-profile project.

“As Project Director, I can confirm that Thornton Roofing has proven itself a trusted and highly capable contractor. I would have no hesitation in recommending them for future major infrastructure and roofing projects.”

Niall Rice

Senior Quantity Surveyor at Felix O’Hare & Co Ltd

“This attention to detail was maintained throughout contract delivery by the installation team.”

“Thornton Roofing provided excellent service during the estimating stage, assisting with Value Engineering solutions to aid in contract negotiations with both the Main Contractor and the Client. This attention to detail was maintained throughout contract delivery by the installation team. The works consisted of felt roofing, hot-melt inverted roof systems, ballast, and green roofing works, all of which were completed on time and on budget.”

Shaun Donnelly

Contracts Manager at Turkington Construction

“But all parties immediately coordinated and implemented a solution that maintained the target completion date that was ultimately achieved.”

“We engaged Thornton Roofing for 48-52 York Street PBSA to provide roofing and cladding services from RIBA stage 5 onwards on this project. To date we have had a long-standing working relationship with Thorntons, particularly on our more complicated schemes. With both elements of this package being a CDP, early engagement in design development and coordination with other façade elements and SFS internally, as well as roof level MEP and acoustic attenuation, was imperative to achieve a meaningful start on site, with what was a very tight programme. Quality of design, coordination and installation throughout was critical, with hold points for site inspections to validate the EWS1 requirements by the independent fire engineers along the way.

“Some substantial variations were introduced with mechanical ventilation early, which could have derailed the programme, but all parties immediately coordinated and implemented a solution that maintained the target completion date that was ultimately achieved. Their staff throughout remained constant. There from start to finish, which is rare these days and should be celebrated. In a city centre location, the logistics of doing such works can be very challenging. Phasing plans, sequences, material deliveries, mast climber access programmes, crane time, were only some of the variables to this complex equation. Throughout, Thorntons played an integral role in developing, supporting, and adjusting these variables while ultimately delivering this fantastic project. We would have no hesitation, and look forward to working with the team again in the not-too-distant future.”

Orlagh McNeill

DB Contracts

“We would have no hesitation in recommending them for future cladding projects.”

“We are extremely pleased with the quality of the cladding supplied for our building refurbishment. The finish looks outstanding and has completely transformed the appearance of the property. The materials are of a very high standard, and the overall result is clean, modern and visually impressive. 

“The supplier was professional and reliable throughout, and the end product speaks for itself. We would have no hesitation in recommending them for future cladding projects.”

We can take
you every step
of the way.

We de-risk delivery and control cost through precise design, quality-led installation, and strong supply chain integration.

The result? Durable, high-performance envelopes that meet technical, regulatory, and architectural demands.

Early Engagement

Detailed estimating aligned to aesthetics, programme, and budget. We provide technical, commercial, and methodology advice that helps architects, developers, and contractors make informed, risk-aware decisions.

Design

2D CAD and 3D BIM to deliver fully complaint drawings and details. Our design process ensures accuracy, buildability, and compliance with building regulations and performance requirements.

Fabrication

In-house manufacturing of glazing and metalwork, giving full control over quality, tolerances, and lead times — ensuring precision and reliability before arriving on site.

Installation

Delivered by our directly employed operatives and trusted subcontractors. We maintain the highest standards of safety, quality, and programme certainty throughout construction.

Maintenance

Planned and reactive maintenance services to extend the life of buildings. Our tailored maintenance contracts safeguard warranties, performance, and asset value over time.

Accredited & Qualified

Start a project together.

Thornton delivered exceptional façade and cladding work on our recent expansion project. Their expertise in design, fabrication, and installation.