Building Envelope Specialists
Thornton is a specialist contractor and fabricator of roofing, cladding, glazing, and metalwork systems.
Our Services
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.”
Duane McCredie
Project Director at Farrans/Sacyr JV
“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
“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. “
Orlagh McNeill
DB Contracts
“We would have no hesitation in recommending them for future cladding projects.”
Shaun Donnelly
Contracts Manager at Turkington Construction
“We would have no hesitation, and look forward to working with the team again in the not-too-distant future.”
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.
