Thomas Sinden

What Thomas Sinden does

Thomas Sinden Limited, trading as Sinden, is a privately held UK construction contractor founded in 1991 and headquartered in Harold Wood, Essex. The company delivers complex new build, refurbishment, structural alteration and heritage restoration projects with a maximum contract value of £50m, operating across nine sectors: education, heritage and listed buildings, residential, community and leisure, student accommodation, blue light, healthcare, defence, commercial and workplace, and public sector. Its geographic footprint is concentrated in London and the South East of England.

The business is structured around six service lines: New Build and Refurbishment (core delivery), Fire Remediation and Cladding (specialist safety, with Gateway 2 approval capability), Restoration and Heritage (conservation expertise), Planned Maintenance, De-carbonisation and Sustainability, and Framework Appointments. The firm holds ISO 9001, ISO 14001 and ISO 45001 certifications, CHAS, Constructionline, JOSCAR, Achilles Network Silver Plus, Cyber Essentials and Investors in People Gold, and reports security clearance for sensitive government environments including the UK Parliament Estate.

Commercially, Sinden generates revenue through fixed-price construction contracts secured primarily via public sector procurement frameworks and competitive tendering. The firm holds 20+ active framework appointments with Pagabo, Fusion 21, GEM, Sovereign, MTVH, NHS trusts and others, providing pre-qualified access to public sector pipelines. Notable clients include Clarion Housing Group, Peabody, UK Parliament, St Albans Cathedral, Medway Council, London Fire Brigade, Imperial War Museums, and Central and North West London NHS Foundation Trust. The company reports a net cash position with zero net debt, 19% of its workforce in earn-and-learn positions against an industry average of less than 3%, and over £1.9m of social value generated across its portfolio in 2025.

Name

Thomas Sinden

Legal name

Thomas Sinden Limited

Website

https://thomas-sinden.co.uk

Company type

Private

Founded year

1991

Operating status

Operating

Headcount range

51–100 employees

Short description

Thomas Sinden (trading as Sinden) is a UK private construction contractor founded in 1991, delivering new build, refurbishment, fire remediation and heritage restoration projects up to £50m across public and private sector clients in London and the South East.

Ownership category

akta.pro rank

Product category

Construction Services

NAICS

Nonresidential Building Construction (2362), Commercial and Institutional Building Construction (23622)

SIC

General Bldg Contractors - Nonresidential Bldgs (1540), Operative Builders (1531)

akta.pro primary industry

Renovation, Remodeling & Tenant Improvements (General Contracting) (IMAFAAAE)

akta.pro secondary industries

Public Works General Contracting (IMAFAAAG), Residential General Contracting (New Build) (IMAFAAAB)

Keywords

• Construction services
• Building refurbishment
• Heritage restoration
• Fire remediation cladding
• Planned maintenance

Headquarters

HQ city

Romford

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, Others

Revenue model

1. Construction Project Delivery: Revenue generated through fixed-price construction contracts for new build, refurbishment, structural alterations, and heritage restoration projects up to £50m in value. Projects span across public and private sectors including education estates, healthcare trusts, heritage bodies, defence clients, and local authorities.

Pricing tiers

Go-to-market motion1 record

Distribution channels3 records

Marketing channels4 records

Core offering

Thomas Sinden is a UK-based construction contractor delivering complex new build, refurbishment, structural alterations, and heritage restoration projects up to £50m in value across London and the South East. The company serves public and private sector clients across nine sectors including education, healthcare, heritage, defence, commercial, residential, and community facilities, operating primarily through public procurement frameworks and competitive tendering.

Product overview

Thomas Sinden (also known as Sinden Construction) is a UK-based construction contractor established in 1991, operating as a single unified construction services business rather than a modular platform. The company offers six interconnected service lines: New Build and Refurbishment (core delivery), Fire Remediation and Cladding (specialist safety), Restoration and Heritage (conservation expertise), Planned Maintenance (ongoing portfolio support), De-carbonisation and Sustainability (green building), and Framework Appointments (procurement access). These services span nine sectors including Education, Heritage and Listed Buildings, Residential, Community and Leisure, Student Accommodation, Blue Light, Healthcare, Defence, Commercial and Workplace, and Public Sector. Projects range up to £50m value, delivered across London and the South East.

Differentiator

Problem solved

Functional benefit

Products and services

• New Build and Refurbishment

Quantifiable outcome

• £1.9m+ social value generated across portfolio in 2025
• +2 more outcomes

Named customers13 records

Segments10 records

Ideal customer profiles5 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Partnerships

Nine partnerships are on record, tiered core and major.

• PagabocoreChannel Partner/ Reseller/ DistributorPublic procurement framework provider through which Sinden secures public sector construction projects. Sinden is appointed to Pagabo framework for construction services.
• GEM FrameworkscoreChannel Partner/ Reseller/ DistributorConstruction framework provider enabling Sinden to access public sector project opportunities through approved procurement channels.
• Fusion 21coreChannel Partner/ Reseller/ DistributorPublic sector procurement framework organisation. Sinden holds active appointment on Fusion 21 framework for construction delivery.
• SovereigncoreChannel Partner/ Reseller/ DistributorHousing association and framework provider. Sinden is appointed to Sovereign framework for construction and refurbishment projects.
• MTVH (Meridian Homex and Your Housing Group)coreChannel Partner/ Reseller/ DistributorMajor housing association operating framework. Sinden holds framework appointment with MTVH for construction services delivery.
• Central and North West London NHS Foundation TrustcoreChannel Partner/ Reseller/ DistributorNHS Trust framework provider. Sinden holds appointment on CNWL framework for healthcare construction and maintenance projects.
• Simpson & Brown ArchitectscoreStrategic or Co-development PartnerArchitecture firm collaborating with Sinden on heritage projects including St Albans Cathedral. Client testimonial confirms close working relationship.
• Clarion Housing GroupmajorChannel Partner/ Reseller/ DistributorLargest housing association in the UK. Sinden has delivered projects including 54 new homes at Ravensbury Estate.
• PeabodymajorChannel Partner/ Reseller/ DistributorMajor London housing association. Listed as a partner organisation on Sinden's website.

Scale indicators7 records

Recent moves6 records

Expansion highlights5 records

Broad incumbents

• Wates Group: Major UK contractor with broad delivery across public sector, education, and commercial segments, overlapping with Sinden's core verticals but at substantially larger scale.
• Morgan Sindall Group: Large UK construction and regeneration group active in public sector, education, heritage, and residential segments through similar framework channels, but operating at significantly larger scale.
• Galliford Try: Larger UK contractor operating across construction and infrastructure with significant overlap in education, healthcare, and public sector frameworks, though at greater scale and broader geography.

Direct peers

• McLaren Construction Group: UK construction contractor delivering mixed-use, residential, education, and commercial projects at similar scale, with comparable London and South East regional exposure.
• Bowmer + Kirkland: UK mid-tier construction contractor delivering commercial, heritage, residential, and public sector projects at similar scale and complexity, with comparable framework and competitive tendering model.
• Buckingham Group Contracting: UK mid-tier contractor delivering commercial, leisure, heritage, residential, and public sector projects across comparable project values with similar framework-based procurement model.
• Willmott Dixon: UK-based construction contractor delivering new build, refurbishment, and heritage projects across education, residential, healthcare, and public sectors with comparable project size profile and regional focus.
• Speller Metcalfe: UK construction contractor of similar size delivering education, heritage, healthcare, and public sector projects across a similar regional footprint.

Emerging players

• Willmott Dixon Interiors: Fit-out and refurbishment specialist operating adjacent to Sinden's renovation services, with overlapping client base across commercial and public sectors.
• Watkin Jones Group: UK-based contractor specialising in student accommodation and residential build-to-rent projects, directly overlapping with Sinden's student accommodation and residential sectors.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat5 records

Key risks6 records

Key highlights7 records

Customer concentration

• LinkedInlinkedin.com/company/thomas-sinden-limited
• Xx.com/thomas_sinden

Compliance8 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 Thomas Sinden