Fire-Rated Windows & Doors · Nationwide
Fire-Rated Glazing · Door Sets
Supply and installation of windows, glazing and door sets for commercial and public-sector buildings across the UK — combining fire performance where required with security, thermal and acoustic requirements, and installed to maintain the integrity of the surrounding structure.
What we do
Supply and installation of windows, glazing and door sets for commercial and public sector buildings — combining fire performance where required with security, thermal and acoustic requirements. Every unit is installed to maintain the integrity of the surrounding structure, with fire-rated units delivered under the same certification and documentation as our fire doors and fire-rated partitions.
Supply and installation of fire-rated glazed screens, borrowed lights and windows — 30 to 120 minutes integrity and insulation — certified as a complete tested system of glass, frame, beads and seals.
View fire-rated glazingCertified fire-rated door sets, including glazed and double-leaf assemblies, supplied and installed as complete units with ironmongery, seals and certification.
View fire-rated door setsArchitectural window and door systems for commercial and public-sector buildings, specified for security, thermal and acoustic performance and installed to detail.
View commercial systemsLike-for-like or upgraded replacement of existing windows and doors in occupied buildings, phased to minimise disruption and installed to maintain compartmentation where units sit on fire lines.
View replacement worksSite survey and specification of the right units for each opening — fire rating, glazing type, frame material and ironmongery — with drawings and product data for approval before manufacture.
View survey & specificationInstallation records, test evidence and certification for every fire-rated unit, so your fire risk assessor, insurer or building control can see exactly what was fitted and how.
View certificationWhere we work
One specialist team, mobilised nationally. MGN operates from Cumbernauld, between Glasgow and Edinburgh, and installs windows and doors across Scotland, England and Wales.
MGN serves commercial landlords, housing associations, NHS facilities and facilities management companies across Greater Glasgow, Edinburgh and the Lothians, and the wider Central Belt. Whether you're specifying units for a new commercial build or replacing windows and doors in an existing building — including the listed and period commercial properties of Edinburgh's Old Town and financial district — our Scottish team delivers within days.
We supply and install windows and door sets for commercial estates, public-sector bodies and main contractors across England and Wales, from single replacements to phased programmes across a portfolio — surveyed, specified and installed to one standard on a single managed contract.
Who we serve
We deliver windows & doors across a wide range of building types and sectors throughout the UK.
Offices, retail, corporate HQs and mixed-use developments.
Compliant systems for hospitals, clinics and health centres.
Schools, colleges and universities — compliance-critical environments.
Window and door installation and replacement for social housing portfolios.
Window and door installation from build stage through to handover.
Ongoing compliance programmes for FM companies managing large building portfolios.
Our credentials
Accreditation means an independent body has verified our processes, training and workmanship — not just our paperwork.
Fire door installation & maintenance
BM TRADA Q-Mark is the UK gold standard for fire door installation and maintenance. Holding this certification means our entire installation process — from specification to sign-off — has been independently assessed and approved. You can verify MGN's registration directly on the BM TRADA scheme website.
Verify our registrationFire door inspection certification
The Fire Door Inspection Scheme (FDIS) is the only nationally recognised scheme for fire door inspection in the UK. Only FDIS-registered inspectors can issue a fire door inspection certificate that carries genuine third-party weight with insurers and enforcing authorities. Most contractors offering fire door inspections are not FDIS registered.
Verify our registrationHealth & safety pre-qualification
CHAS (Contractors Health and Safety Assessment Scheme) is the standard pre-qualification requirement for most public sector procurement across the UK. If your building is NHS, council or publicly funded, MGN's CHAS accreditation means we can be appointed without additional vetting.
Institute of Fire Safety Managers
IFSM membership demonstrates ongoing commitment to professional development and regulatory awareness in fire safety management. It is a signal that MGN's team stays current with legislative changes and best practice — not just at time of certification, but continuously.
Client trust
“MGN completed fire stopping surveys and remediation across three of our Scottish properties. Every installation was fully certified and signed off on schedule. They are our premier provider of passive fire protection services in Scotland.”
Simon Cheltenham
Facilities Director, Forte Hotels
“We manage a large portfolio of properties across Scotland and MGN handles all our passive fire protection work. Their documentation is thorough and every project is compliant from day one. I wouldn't use anyone else.”
Stuart McBride
Portfolio Property Owner, Scotland
“All our contract work in Scotland goes to MGN. Their fire door inspection reports are detailed, their remediation work is fast, and they understand the compliance requirements for our sector inside out.”
Jen Ferguson
Operations Manager, National Fire Protection
“The specification and installation quality from MGN is consistently at the highest standard. They understand the requirements of complex commercial environments and deliver certification documentation that stands up to audit.”
Tina Berry
Project Manager, Commercial Development
The law
Fire-rated windows and doors must be certified and correctly installed to perform as intended. Where a door set or glazing unit forms part of a building's fire strategy, the responsible person carries legal liability if it's non-compliant or incorrectly fitted.
Place a continuing duty on the responsible person to maintain fire-resisting doors and glazing in efficient working order and good repair. Non-compliance can result in criminal prosecution.
Set the fire-resistance requirements for doors and glazed elements on compartment lines and escape routes in England & Wales and Scotland respectively.
The fire-resistance test standards for door and shutter assemblies and glazed elements, and the code of practice for the installation of fire door assemblies.
British Standards governing fire safety in building design and the survey and installation of windows and external door sets.
A fire door or fire-rated window that is uncertified or incorrectly installed can invalidate a building's fire strategy and expose the responsible person to liability. Certification and correct installation must be documented to be defensible.
This summary is not legal advice — your own fire risk assessment sets out the specific duties for your building.
Quick answers
Where the opening requires it, yes. We supply and install fire-rated glazed screens, windows and door sets certified from 30 to 120 minutes, installed as complete tested systems. We also install non-fire-rated architectural windows and doors where fire performance isn't required — the specification follows the building's fire strategy.
Our Fire Doors service covers the full lifecycle of internal fire door assemblies — installation, third-party inspection, maintenance and repair. Windows & Doors covers glazed screens, windows and external or architectural door sets, including fire-rated glazing, alongside their thermal, acoustic and security performance. Both are delivered under the same accreditations and documentation.
Yes. We regularly work in listed and period commercial buildings, specifying frame materials, profiles and glazing that respect the building's character while meeting modern fire, thermal and security requirements — and we can support listed building consent applications with drawings and product data.
Yes. Replacement and upgrade programmes are phased around occupancy, with openings weather-tight and secure at the end of each shift and out-of-hours working where the building demands it.
Yes. MGN supplies and installs windows, glazing and door sets for commercial and public-sector clients across Scotland, England and Wales, including multi-site programmes managed under a single contract.
Whether you're specifying units for a new build or replacing windows and doors in an existing building, we respond within 48 hours and provide a fixed-price quotation.