Celtic Contractors
Celtic Contractors Ltd is a privately held, family-owned specialist interior fitout subcontractor delivering suspended ceilings, drywall and glass partitions, GRG features, doors and joinery, plus in-house BIM and 3D scanning design services, serving Tier 1 main contractors and named commercial occupiers across London.
- Company typePrivate
- Founded1995
- HeadquartersLondon, United Kingdom
- Headcount11–50
- GTM typeB2B
- OfferingServices
What Celtic Contractors does
Celtic Contractors Ltd is a privately held, family-owned specialist interior fitout subcontractor based in Morden, Surrey, operating across London and the wider UK. Founded in 1995 by John Whyte as a drywall and ceiling business, the company has grown into a full-service fitout contractor delivering suspended ceilings, drywall partitions, glass partitions, WC fitouts, GRG (glass reinforced gypsum) decorative features, doors and joinery, plus in-house design and BIM coordination services. Its core technology stack comprises Building Information Modelling (BIM), 3D laser scanning, AutoCAD, Revit and Navisworks, which support design coordination, clash detection, digital measured surveys, and prefabrication across projects.
The company operates an enterprise field-sales model, working both as a specialist subcontractor to Tier 1 main contractors — Mace, Sir Robert McAlpine, Lendlease and McLaren — and directly with named commercial occupiers including Al Jazeera (The Shard), Baker McKenzie, BT, Diageo, Cleveland Clinic, and Tottenham Hotspur. Its project portfolio includes 560,000 sq ft at 8 Bishopsgate, 320,000 sq ft at BT One Braham, and 153,000 sq ft at Baker McKenzie's 280 Bishopsgate, and the company states it has delivered fitout work on every London skyscraper in the City.
Celtic generates revenue primarily through project-based contracts (one-off installations and professional design fees) awarded via competitive tendering and direct negotiation. The firm holds ISO 9001/14001/45001, Achilles Building Confidence, SafeContractor, Considerate Constructors Scheme, and Sedex certifications, and reports 1 million+ man-hours worked without incident, a 0% accident frequency rate, and 100% CSCS card coverage. Leadership transitioned in 2019 from founder John Whyte (now Chairman) to his son Jon Whyte (Managing Director), with two additional director appointments made in January 2022.
Celtic Contractors firmographics
Firmographics- Name
- Celtic Contractors
- Legal name
- Celtic Contractors Ltd
- Website
- https://celticcontracts.co.uk
- Company type
- Private
- Founded year
- 1995
- Operating status
- Operating
- Headcount range
- 11–50 employees
- Short description
- Celtic Contractors Ltd is a privately held, family-owned specialist interior fitout subcontractor delivering suspended ceilings, drywall and glass partitions, GRG features, doors and joinery, plus in-house BIM and 3D scanning design services, serving Tier 1 main contractors and named commercial occupiers across London.
- Ownership category
- akta.pro rank
Celtic Contractors industry classification
Industry- Product category
- Commercial Interior Fitout Services
- NAICS
- Nonresidential Building Construction (2362)
- SIC
- Construction - Special Trade Contractors (1700), General Bldg Contractors - Nonresidential Bldgs (1540)
- akta.pro primary industry
- Drywall, Partitions & Suspended Ceilings (IMAFANAG)
- akta.pro secondary industry
- Joinery, Millwork & Casework Installation (Cabinetry, Built-Ins) (IMAFANAJ)
Keywords
Where Celtic Contractors is headquartered
LocationHeadquarters
- HQ city
- London
- HQ country
- United Kingdom
- HQ region
- Europe
Offices1 record
Markets served
Celtic Contractors business model
Business model- GTM type
- B2B
- Offering type
- Services
- Cost components
- Personnel, Supply Chain, Operations, Infrastructure, Technology or R&D, Marketing or Sales
Revenue model
- Interior Fitout Services: Project-based revenue from commercial office fitouts including partitions, ceilings, WC fitouts, doors, and glass partitions. Revenue generated through competitive tendering and direct project awards from main contractors and occupiers.
- Specialist Installation Services: Installation services for suspended ceilings, drywall partitions, GRG products, glass partitions, and doors & joinery. Revenue earned through labour and installation contracts on commercial projects.
- Design and Coordination Services: In-house design services using BIM, 3D laser scanning, and CAD for commercial fitout projects. Design fees integrated into overall project costs.
Go-to-market motion1 record
Distribution channels2 records
Marketing channels5 records
Celtic Contractors product offering
Product offeringCore offering
Celtic Contractors is a London-based commercial interior fitout specialist delivering suspended ceilings, drywall partitions, glass partitions, WC fitouts, GRG decorative products, doors and joinery, and full office fitout services for high-rise and major commercial projects. The company combines in-house design, BIM coordination, 3D laser scanning, and installation teams to act as a specialist subcontractor to tier 1 main contractors and a direct contractor to commercial occupiers across the City of London and Greater London.
Product overview
Celtic Contractors offers a unified suite of interior fitout and construction services, positioning itself as a market leader in commercial office fitouts. The portfolio consists of nine interconnected core services: Office Fitouts (the primary offering encompassing partitions, ceilings, WC fitouts and doors), Suspended Ceilings, Drywall Partitions, WC Fitouts, Glass Partitions, Glass Reinforced Gypsum (GRG), Doors & Joinery, Design, and Building Information Modelling (BIM). These services are delivered through experienced in-house teams, with BIM and Design capabilities providing coordination and visualisation support across all fitout projects.
Differentiator
Problem solved
Functional benefit
Products and services
- Office Fitouts Commercial office fitout and refurbishment services including all partitions, ceilings, WC fitouts and doors, delivered by in-house teams for office interiors in commercial and high-rise buildings.
- Suspended Ceilings Design, supply and installation of bespoke suspended ceiling solutions including metal and mineral ceiling systems, lay-in grid, fabric and mesh, gypsum plasterboard ceilings, chilled beam installation, ceiling rafts and baffles for commercial and high-rise buildings.
- Drywall Partitions Installation of dry lining partition systems using British Gypsum, Siniat, Lafarge and Knauf products, ensuring fire and acoustic protection compliance with accredited standards for commercial interiors.
- WC Fitouts Complete installation of modular and bespoke WC fitouts including branded cubical systems, architectural systems, and all mechanical and electrical work for commercial washrooms.
- Glass Partitions Design, supply and installation of modular glass partition systems including architectural finishes and doors with ironmongery for commercial office interiors.
- Glass Reinforced Gypsum (GRG) Design, build and installation of decorative fibrous plaster ceilings and features using Glass Reinforced Gypsum products, including bespoke CNC moulds for consistency across commercial interiors.
- Doors & Joinery Supply and installation of door sets including fire, acoustic, security and x-ray variants, along with washroom cubicles, IPS panelling and vanity units, using responsibly sourced timber for commercial interiors.
- Design Collaborative design solutions producing working drawings using 2D or 3D design, incorporating 3D laser scanning for floor-to-ceiling renders and digital measured surveys for commercial fitout projects.
- Building Information Modelling (BIM) Visual, interactive 3D building models enabling collaboration, clash detection, coordination and facility management, supported by precision 3D scanning and digital fabrication for fitout project delivery.
Quantifiable outcome
- 690 successfully completed projects
- +5 more outcomes
Companies that use Celtic Contractors
Customer profileNamed customers8 records
Segments4 records
Ideal customer profiles3 records
Celtic Contractors technology and API
TechnologyTechnology focussed No
API detail
- Has API
- No
- API docs
- API detail
Core technology
AI maturity
App detail
Feature3 records
Celtic Contractors partnerships and signals
Strategic signalPartnerships
Nine partnerships are on record, tiered core and minor.
- MacecoreMajor UK construction company. Celtic works as specialist subcontractor providing interior fitout services on Mace-managed projects including commercial office developments.
- Sir Robert McAlpinecoreSir Robert McAlpine is a major UK construction and engineering company. Celtic provides specialist fitout services on their projects.
- LendleasecoreInternational property and infrastructure company. Celtic worked on Lendlease's 8 Bishopsgate project (50-floor building by Stanhope and Mitsubishi).
- McLarencoreConstruction and infrastructure company. Celtic worked on McLaren's Cleveland Clinic London project at 55 Moorgate.
- OverburyminorOffice fitout and refurbishment specialist. Listed as a company Celtic is proud to be working with.
- StructuretoneminorConstruction company specialising in interior construction. Listed as a company Celtic is proud to be working with.
- Trusted GRG ManufacturerscoreWorking with trusted and respected manufacturing partners for GRG (Glass Reinforced Gypsum) products. Delivers award-winning decorative fibrous plaster ceilings and features.
- Architectural and Performance Door SupplierscorePartnership with finest industry leading architectural and performance door, ironmongery and timber product suppliers for door sets and joinery.
- Ceiling System Manufacturers (SAS International, AUTEX, Oscar Acoustics, Durlum, British Gypsum)coreStrong relationships with major ceiling manufacturers enabling supply power and cost-effective procurement for suspended ceiling installations.
Scale indicators8 records
Recent moves5 records
Expansion highlights5 records
Celtic Contractors competitors and assessment
Company assessmentDirect peers
- Morgan Lovell: Morgan Lovell is a UK office interiors and fitout specialist working across partitions, ceilings, joinery, furniture integration and design — directly comparable in offering and customer base to Celtic's commercial fitout business.
- Overbury: Overbury is one of the UK's largest office-fitout and refurbishment contractors working with major occupiers on City and regional schemes — closely mirroring Celtic's commercial fitout positioning and even named by Celtic as a current partner.
- Oktra: Oktra is a UK office interior fitout and workplace design specialist delivering partitions, ceilings, joinery and bespoke finishes to commercial occupiers — a like-for-like specialist competitor to Celtic in London's office market.
- Structuretone: Structuretone is a global interior-construction specialist delivering fitout, drywall, ceilings and joinery for commercial occupiers — directly comparable in service mix and project type to Celtic, and listed by Celtic as a partner.
- BW (Workplace Interiors): BW is a UK specialist in office interior fitout and refurbishment offering partitions, ceilings, mechanical/electrical and design coordination — directly comparable to Celtic's nine-service office-fitout model across British occupiers.
- Knight Harwood: Knight Harwood is a London-focused construction and interior fitout specialist with strong sector experience in commercial office and heritage projects — a closely comparable London fitout specialist to Celtic.
Broad incumbents
- Lendlease: Lendlease is a global real-estate and construction group with deep London development activity (e.g. 8 Bishopsgate) and significant interior fitout capability — broader than Celtic, but operating in the same project pipeline that feeds Celtic subcontract flow.
- McLaren Construction Group: McLaren is a major UK general contractor with significant interior fitout and refurbishment capability, working across commercial, healthcare and residential — broader and principal-contractor oriented than Celtic, but overlapping on fitout scopes (and an existing client/partner of Celtic).
- Sir Robert McAlpine: Sir Robert McAlpine is a tier-1 UK contractor with civil, building and interior-fitout capability across major London schemes — broader than Celtic but overlapping on fitout scopes; named as a Celtic partner.
- Mace Group: Mace is a global construction and consultancy group with major London presence and a dedicated interiors arm — broader scope than Celtic, but overlapping on fitout scopes; also a major client/partner of Celtic.
Market position
Strengths5 records
Weaknesses5 records
Competitive moat5 records
Key risks6 records
Key highlights6 records
Customer concentration
Celtic Contractors social profiles
Digital presenceCeltic Contractors compliance and trust
Trust signalCompliance10 records
Celtic Contractors financial estimates
Financial estimateRevenue estimate
Valuation estimate
Celtic Contractors leadership team
Management profileNumber of profiles
Profiles10 records
Celtic Contractors funding detail
Funding detailFunding overview
Funding rounds
Investors
Funding detail is available on the Subscription and Enterprise plan.Contact sales →
Celtic Contractors M&A and investment
M&A and investmentM&A
Investments
M&A and investment is available on the Subscription and Enterprise plan.Contact sales →
Frequently asked questions about Celtic Contractors
What does Celtic Contractors do?
Celtic Contractors is a London-based commercial interior fitout specialist delivering suspended ceilings, drywall partitions, glass partitions, WC fitouts, GRG decorative products, doors and joinery, and full office fitout services for high-rise and major commercial projects. The company combines in-house design, BIM coordination, 3D laser scanning, and installation teams to act as a specialist subcontractor to tier 1 main contractors and a direct contractor to commercial occupiers across the City of London and Greater London.
Is Celtic Contractors a public or private company?
Celtic Contractors is a private company. It is classified as family owned and is currently operating.
When was Celtic Contractors founded?
Celtic Contractors was founded in 1995. It employs 11 to 50 people.
Where is Celtic Contractors based?
Celtic Contractors is headquartered in London, United Kingdom, in the Europe region.
How does Celtic Contractors make money?
Three revenue lines are on record. Interior Fitout Services are the primary driver. The others are specialist Installation Services and design and Coordination Services.
Who are Celtic Contractors's main competitors?
Direct peers on record are Morgan Lovell, Overbury, Oktra, Structuretone, BW (Workplace Interiors) and Knight Harwood. Broad incumbents are Lendlease, McLaren Construction Group, Sir Robert McAlpine and Mace Group.
Does Celtic Contractors have an API?
No public API is recorded for Celtic Contractors.
What industry is Celtic Contractors in?
Celtic Contractors's product category is Commercial Interior Fitout Services. Its primary akta.pro industry code is IMAFANAG, Drywall, Partitions & Suspended Ceilings, with a secondary code of IMAFANAJ, Joinery, Millwork & Casework Installation (Cabinetry, Built-Ins). Its NAICS code is 2362 and its SIC code is 1700.