Quinn London

What Quinn London does

Quinn London Limited is a privately held main contractor headquartered in Mill Hill, London, delivering construction, refurbishment, heritage restoration, and retrofit works across the capital and more recently into southern England. Founded in 2000 by Seamus Quinn, the company operates through three specialist divisions — Property Services (social housing and local authorities), Central London (NHS, government, academic, and charity clients), and Heritage (listed buildings, museums, and conservation) — covering healthcare, education, residential, commercial, public buildings, planned refurbishment, firestopping and cladding, retrofit, and cyclical maintenance. Its underlying technology is conventional construction project delivery, with no proprietary software platform disclosed; technical differentiation rests on heritage conservation expertise, FIRAS and BREEAM credentials, and PAS 2030/2035 retrofit qualifications.

The company generates revenue primarily through project-based construction contracts, with individual project values ranging from £128k to £18.5m, and earned approximately £109m in turnover for the year ending 31 May 2025 with profit before tax exceeding £4m. Go-to-market is enterprise field sales: direct engagement with local authorities, housing associations, NHS bodies, universities, and commercial property owners via competitive tendering, framework agreements, and direct appointments. It serves 108 clients across 48 active project sites, with 75% of business from repeat customers and a supply chain of 245 approved subcontractors and 168 working suppliers. In May 2026, the company transitioned to an Employee Ownership Trust, with founder Seamus Quinn continuing as Group Chairman and Joint Managing Directors Patrick McGrath and Gerry O'Connor leading operations.

Name

Quinn London

Legal name

Quinn London Limited

Website

https://quinnlondon.co.uk

Company type

Private

Founded year

2000

Operating status

Operating

Headcount range

101–250 employees

Short description

Quinn London is a London-based main contractor delivering construction, refurbishment, heritage restoration, and retrofit services across social housing, healthcare, education, commercial, and public sectors, serving 108 clients with 170+ employees and approximately £109m in annual turnover.

Ownership category

akta.pro rank

Headquarters

HQ city

London

HQ country

United Kingdom

HQ region

Europe

Offices1 record

Markets served

GTM type

B2B

Offering type

Services

Cost components

Personnel, Supply Chain, Operations, Technology or R&D, Marketing or Sales, Others

Revenue model

1. Construction contracting: Project-based construction contracts delivering end-to-end project execution across commercial, residential, heritage, education, healthcare, and public building sectors. Revenue derived from one-time project fees for construction, refurbishment, and renovation works. Framework agreements with key clients provide recurring engagement. Annual turnover of approximately £109 million.

Go-to-market motion1 record

Distribution channels1 record

Marketing channels5 records

Core offering

Quinn London is a London-based main contractor delivering end-to-end construction, refurbishment, and heritage restoration projects. Operating through three specialist divisions (Property Services, Central London, and Heritage), the company serves housing associations, local authorities, NHS bodies, educational institutions, museums, and commercial property owners. Projects range from £128k to £18.5m across 48 active sites, with an annual turnover of approximately £109 million.

Product overview

Quinn London is a privately owned construction company founded in 2000, operating as a main contractor across London. The company operates through three specialist divisions: Central London Division (serving NHS, government, and academic clients), Heritage Division (specializing in conservation of listed buildings and museums), and Property Services Division (working with housing associations and local authorities). The company delivers end-to-end project construction across multiple sectors including Healthcare, Heritage, Residential, Commercial, Education, Public Buildings, Planned Refurbishment, Firestopping and Cladding, Retrofit, and Cyclical Maintenance. With an annual turnover of approximately £109 million and 170+ employees, the company manages projects ranging from £500k to £18.5 million across 48 active sites.

Differentiator

Problem solved

Functional benefit

Products and services

• Healthcare Construction Construction and refurbishment services for healthcare facilities including hospitals and medical buildings, delivered for NHS bodies, health and social care providers, and emergency services authorities.
• Heritage and Conservation Specialist restoration and conservation of historic and listed buildings including Grade I, II*, and II listed churches, museums, arts venues, and heritage sites for cultural institutions and private clients.
• Residential Construction New build and refurbishment of residential properties including social housing, affordable housing, and private residential developments for housing associations, local authorities, and private estate owners.
• Commercial Construction Commercial building construction, office refurbishment, and fit-out services for commercial property owners, occupiers, and railway arch landlords across London.
• Education Sector Construction Construction and refurbishment services for educational institutions including schools, universities, and colleges, with capability to deliver works in occupied environments and historic settings.
• Public Buildings Construction Construction and refurbishment of public and community buildings including community centres, libraries, civic facilities, and supported accommodation for local authorities and charities.
• Planned Refurbishment Works Planned maintenance and refurbishment programmes for housing associations and local authorities, including large-scale kitchen and bathroom replacement frameworks across thousands of properties.
• Firestopping and Cladding Remediation Fire safety remediation works including external wall insulation, cladding replacement, and firestopping services for housing associations and local authorities under FIRAS accreditation.
• Retrofit Services Energy efficiency retrofit works including external wall insulation, window replacements, and loft insulation delivered to PAS 2030 and PAS 2035 standards for housing providers and property owners.
• Cyclical Maintenance Cyclical maintenance and external repair programmes for housing stock including redecoration, component replacement, and estate-wide refurbishment for housing associations and local authorities.

Quantifiable outcome

• 75% of business from repeat customers
• +2 more outcomes

Named customers18 records

Segments8 records

Ideal customer profiles4 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Partnerships

Six partnerships are on record, tiered core and supporting.

• Kingston CouncilcoreStrategic or Co-development Partner · 24 March 2026Continuation of fire safety programme partnership with Kingston Council. Additional funding allocated towards high-priority fire safety works as part of wider effort following Grenfell tragedy. Quinn London recognised as trusted delivery partner with deep understanding of housing stock and consistent capable approach.
• The Arch CompanycoreStrategic or Co-development PartnerFramework partnership for refurbishment of derelict railway arches into lettable warehouse and office spaces. As of present, Quinn London has successfully completed 16 projects under this partnership. The Arch Company is the UK's largest small business landlord with approximately 5,200 railway arches and is pursuing Project 1000 initiative to repurpose 1,000 vacant spaces by 2030.
• PeabodycoreStrategic or Co-development Partner10-year framework agreement for delivery of planned programme of kitchen and bathroom replacements across Peabody's housing estate. Works form part of long-term investment strategy to improve living standards. Over first four years, Quinn London successfully refurbished more than 2,500 properties achieving 100% resident satisfaction score.
• LighthousesupportingStrategic or Co-development PartnerMental health charity partnership providing support to employees. Part of company's commitment to employee wellbeing alongside designated mental health first aiders at all levels of business.
• London Living WagesupportingStrategic or Co-development PartnerProud member of London Living Wage initiative, commitment that helps significantly reduce risks of individuals working at sites being paid below national minimum wage - a key modern slavery risk.
• Islington CouncilcoreStrategic or Co-development PartnerFramework agreement holder for works with Islington Council. Completed both new build and refurbishment works. Currently engaged in Stacey Street supported accommodation conversion for people who have been homeless.

Scale indicators9 records

Recent moves7 records

Expansion highlights5 records

Direct peers

• Willmott Dixon: UK-focused main contractor with strong refurbishment, social housing, and education sector credentials. Comparable business model and customer base, with similar emphasis on frameworks and repeat public sector clients.
• Rydon Group: UK construction and development group with maintenance, refurbishment, and new build operations across housing, healthcare, and education. Comparable as a mid-tier UK contractor serving housing associations and public sector clients with similar planned maintenance offerings.
• Morgan Sindall Group: UK contractor and regeneration group with substantial London presence, social housing refurbishment, heritage works, and education sector delivery. Comparable across most verticals, though much larger and listed.
• Bowmer + Kirkland: UK privately owned main contractor delivering commercial, heritage, education, and leisure projects. Closely comparable as a mid-sized, family-influenced contractor with strong heritage credentials and similar project value range.
• McLaren Construction Group: UK mid-tier main contractor with strong London commercial, residential, and public sector presence. Comparable in scale and project mix, though Quinn London has a stronger heritage and social housing specialism.
• Wates Group: UK main contractor with significant social housing, education, and public sector refurbishment exposure. Closely comparable in client mix (housing associations, local authorities) and Planned Maintenance framework business, though substantially larger.
• Mace Group: London-headquartered main contractor delivering commercial, public, heritage, and residential projects. Comparable in London-centric operating model and public/private sector client base, though typically operating at a larger scale on higher-value commercial schemes.

Broad incumbents

• Multiplex Construction (UK): Global tier-one contractor with significant London presence delivering large commercial, residential, and mixed-use schemes. Comparable in London market focus and public sector exposure, though at higher project values.
• Skanska UK: Major UK contractor operating broadly in commercial, public, and infrastructure sectors. Comparable in public sector and heritage project delivery, though at significantly larger scale and with a more diversified portfolio.

Emerging players

• Re-Gen Group: UK-focused contractor delivering new build, refurbishment, and fit-out across social housing, education, and healthcare. Comparable in client segments and project value range, with overlapping London footprint but smaller scale.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat5 records

Key risks6 records

Key highlights7 records

Customer concentration

• Xx.com/quinnlondonltd
• YouTubeyoutube.com/channel/UCoaLAT8UKlpqVYrJqJxNh1w
• LinkedInlinkedin.com/company/quinn-london-ltd

Revenue estimate

Valuation estimate

Number of profiles

Profiles4 records

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 Quinn London