Sealtite Group

What Sealtite Group does

Sealtite Group is a UK-based architectural glazing specialist, founded in 1986 and headquartered in Dartford, Kent, operating under the legal entity Sealtite Group Ltd (company number 03979466). The group consists of Sealtite Windows and Sealtite Glass, and provides design, manufacture, supply, and installation of high-performance fenestration and glazing systems — including windows, doors, curtain walling, structural glazing, ultra slim sliding doors, and roof glazing — through both aluminium and PVCu systems sourced from a network of 11 systems partners (Technal, Schuco, Kawneer, Sapa, Metal Technology, Veka, Deceuninck, Jack Aluminium, Profile 22, AluK, Aluprof).

The company's go-to-market is enterprise field sales, engaging directly with main contractors, architects, and property developers on specification-driven construction projects across London and seven Home Counties (Kent, Essex, Surrey, Sussex, Hampshire, Hertfordshire and beyond). Customers are entirely enterprise or institutional, with a disclosed project portfolio spanning education (Imperial College London, Rikkyo School, Royal College of Music), healthcare (Queen Mary's University Hospital, Kings College Hospital), retail (McDonald's, Lidl, Travis Perkins), hospitality (Butlin's), and leisure (Wingham Wildlife Park), with individual contract values disclosed between £42k and £828k.

Revenue is generated through one-off project contracts priced on specifications, scope, and contract value (not publicly disclosed). The business holds six compliance accreditations — CHAS, Construction Line, CE Mark, ISO, BSI, and PWF — supporting eligibility on UK construction tenders and public-sector frameworks. Headcount is reported in the 11–50 band, with no disclosed revenue, funding events, M&A activity, leadership changes, or expansion beyond Southern England in the available data.

Name

Sealtite Group

Legal name

Sealtite Group Ltd

Website

https://sealtitegroup.co.uk

Company type

Private

Founded year

1986

Operating status

Operating

Headcount range

11–50 employees

Short description

Sealtite Group is a UK architectural glazing specialist that designs, manufactures, supplies, and installs high-performance windows, doors, curtain walling, and structural glazing systems for construction industry clients across Southern England, serving commercial, education, residential, and leisure sectors.

Ownership category

akta.pro rank

Product category

Glazing Contracting & Architectural Fenestration

NAICS

Glass and Glazing Contractors (23815), Glass and Glazing Contractors (238150)

SIC

Construction - Special Trade Contractors (1700)

akta.pro primary industry

Interior Glazing & Glass Partitions (IMAFANAK)

Keywords

• Architectural glazing systems
• Curtain walling fabrication
• Fenestration installation
• Structural glass solutions
• Commercial glazing services

Headquarters

HQ city

Dartford

HQ country

United Kingdom

HQ region

Europe

Offices1 record

Markets served

GTM type

B2B

Offering type

Services

Cost components

Personnel, Supply Chain, Operations, Infrastructure, Marketing or Sales

Revenue model

1. Glazing Systems Design, Manufacture and Installation: Project-based revenue from design, fabrication, supply and installation of high-performance fenestration and glazing systems to construction industry clients including main contractors and architects.

Go-to-market motion1 record

Distribution channels1 record

Marketing channels4 records

Core offering

Sealtite Group is a Dartford-based glazing contractor that designs, fabricates, supplies and installs aluminium and PVCu fenestration products — including windows, doors, curtain walling, roof glazing and structural glazing — for construction projects. The company operates as a specialist subcontractor to main contractors, architects and property developers across Southern England, bundling design, manufacture and installation into single project contracts.

Product overview

Sealtite Group is an architectural glazing specialist offering a unified product portfolio of high-performance fenestration and glazing systems. The company provides six core product categories: Structural Glazing (frameless glass installations with hidden fixings), Ultra Slim Sliding Doors (contemporary slim-framed doors), Roof Glazing (frameless and framed rooflight solutions), Curtain Walling (thermally-broken aluminium systems), Doors, and Windows. These products are manufactured and installed for the construction industry across commercial, education, residential, and leisure sectors. Sealtite Group operates as both fabricator and installer, working with supplier partners including Technal, Schuco, Kawneer, Sapa, Veka, Metal Technology, Jack Aluminium, Deceuninck, and Profile 22.

Differentiator

Problem solved

Functional benefit

Products and services

• Structural Glazing Design, fabrication, supply and installation of structural glazing systems for commercial and architectural projects.
• Ultra Slim Sliding Doors Fabrication and installation of ultra slim-framed sliding door systems for residential, commercial and leisure projects.
• Roof Glazing Design, fabrication, supply and installation of roof glazing systems, including glazed roofs and rooflights.
• Curtain Walling Fabrication and installation of aluminium curtain walling systems for commercial, education and residential building façades.
• Doors Fabrication, supply and installation of aluminium and PVCu commercial and architectural doors.
• Windows Fabrication, supply and installation of aluminium and PVCu windows for commercial, education, residential and leisure projects.

Named customers12 records

Segments4 records

Ideal customer profiles2 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature4 records

Partnerships

Six partnerships are on record, tiered core.

• Technal UKcoreTechnology or IntegrationPreferred aluminium systems partner providing low-carbon aluminium made with recycled post-consumer scrap. Technal systems used across windows, doors, curtain walling, and structural glazing installations.
• SchucocoreTechnology or IntegrationPremium aluminium systems partner for windows, doors, and curtain walling. Schuco systems featured in high-specification commercial and residential projects.
• VekacoreTechnology or IntegrationPVCu systems partner for windows and doors, providing alternative material options to aluminium.
• Metal TechnologycoreTechnology or IntegrationAluminium systems partner providing window and curtain walling systems for construction projects.
• SapacoreTechnology or IntegrationAluminium systems partner for windows, doors, curtain walling, and sliding doors widely used across projects.
• KawneercoreTechnology or IntegrationArchitectural aluminium systems partner for curtain walling, windows, and doors in commercial applications.

Scale indicators2 records

Recent moves1 record

Expansion highlights5 records

Direct peers

• Smart Systems: UK-based aluminium and PVCu window, door and curtain wall fabricator. Comparable specialist fenestration fabricator supplying construction industry with systemised glazing products similar to Sealtite's systemised glazing range.
• Polyframe: UK window and door fabricator supplying PVCu and aluminium products to the construction trade. Comparable specialist fabrication business operating across residential and commercial segments.
• Crittall Windows: Historic UK steel and aluminium window manufacturer/fabricator with comparable heritage position and bespoke fabrication capability for commercial, education and residential projects.
• Senior Architectural Systems: UK aluminium systems manufacturer and fabricator offering curtain walling, windows, doors and facade solutions. Highly comparable vertically-integrated fabrication model serving commercial, education and residential construction across the UK.
• Britelite Windows: UK trade window, door and conservatory fabricator serving commercial and residential construction. Similar size band and fabrication-led business model targeting UK construction industry.
• Cornish Glass: UK architectural glazing contractor offering design, manufacture and installation of windows, doors, curtain walling and structural glazing. Directly comparable regional glazing specialist contractor model.

Broad incumbents

• Reynaers Aluminium: Belgian-headquartered aluminium systems supplier with UK operations providing windows, doors, curtain walling and sliding doors. A core Sealtite systems partner and a major incumbent in the same aluminium fenestration category.
• Kawneer: Global architectural aluminium systems supplier (Arconic) whose curtain walling, window and door systems are used by Sealtite. Larger incumbent whose systems portfolio overlaps substantially with Sealtite's fabricated offering.
• Schueco: German-headquartered aluminium and PVCu systems supplier with UK operations offering premium windows, doors and curtain walling. A Sealtite systems partner and broad incumbent across the same glazing category.

Others

• Pilkington: Major UK and global glass manufacturer supplying flat and processed glass products to glazing contractors including Sealtite. Adjacent supplier in the same fenestration value chain rather than a direct contracting competitor.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat3 records

Key risks7 records

Key highlights7 records

Customer concentration

• Xx.com/SealtiteGroup
• LinkedInlinkedin.com/company/sealtite-group
• Instagraminstagram.com/sealtitegroup

Compliance6 records

Revenue estimate

Valuation estimate

Number of profiles

Funding overview

Funding rounds

Investors

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A

Investments

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about Sealtite Group