SM COMPOSITES LTD

What SM COMPOSITES LTD does

SM Composites Ltd is a private UK composites workshop headquartered at Harts Boatyard in Surbiton, southwest London, specialising in the design, build, repair, and refurbishment of composite structures for racing dinghies, sports boats, and other custom projects. The company operates a single-site service model with 1-10 employees, run by co-founders Jamie Stewart (Managing Director, Yacht and Powercraft graduate of Southampton Solent University, formerly of Magma Structures and Harts Boatyard) and his father Ossie Stewart, a 1992 Olympic bronze medalist in the Soling class with 40 years of boatyard operating experience. Service offerings span three lines: dinghy and sports boat repairs (gelcoat restoration, structural damage repair, carbon mast and spar repair); refurbishments (advanced race preparation, foil refurbishment, hull conditioning, paintwork and lacquering in a dedicated spray booth); and new design and build services for class associations, custom dinghies, sports boats up to 24 metres, industrial moulds, and select non-marine composite applications. Notable customer engagements include Sailing Yacht A's superyacht mast, Black Pearl dyno rigs, America's Cup aero fairings and wing mast components, IMOCA 60 racing components, RS Range class boats (with 50+ RS800s and 50+ K1s produced), and Thames A Rater restorations. SM Composites holds Selden approved repair and build centre status and is an authorised repair service for most major boat insurance companies, the latter providing a claims-driven inbound channel alongside direct phone, email, website form, Facebook, and Instagram acquisition. The company generates revenue through bespoke, quote-based professional services — repair work, refurbishment work, and one-off design/build commissions — with free estimates as the primary lead-generation tool. Pricing is not publicly disclosed, and no app, digital product, subscription, or recurring contracted revenue stream exists; the model is fundamentally project-based services delivered from a single workshop.

Name

SM COMPOSITES LTD

Legal name

SM Composites Ltd

Website

https://smcomposites.co.uk

Company type

Private

Founded year

2019

Operating status

Operating

Headcount range

1–10 employees

Short description

SM Composites Ltd is a UK composites workshop in Surbiton, southwest London, that designs, builds, repairs, and refurbishes racing dinghies, sports boats, and custom composite projects for class associations, individual owners, and professional sailing teams.

Ownership category

akta.pro rank

Product category

Marine Composite Manufacturing and Repair Services

NAICS

Boat Building (336612)

SIC

Ship & Boat Building & Repairing (3730)

akta.pro primary industry

FRP/GRP & Composite Materials (Resins, Fibers, Core Materials) (IMAJAKAC)

akta.pro secondary industries

Sandwich Panels & Core Materials (Foam, Balsa, Honeycomb) (IMAJAKAD), Outfitting Modules & Skids (Accommodation, Machinery, E-House, Pipe Racks) (IMAJAKAF)

Keywords

• Composite boat building
• Marine repair services
• Dinghy racing repairs
• Carbon fibre fabrication
• Boat refurbishment services

Headquarters

HQ city

London

HQ country

United Kingdom

HQ region

Europe

Offices1 record

Markets served

GTM type

B2C

Offering type

Services

Cost components

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

Revenue model

1. Repair Services: Bespoke repair services for dinghies, sports boats, and marine equipment including structural damage, gelcoat work, mast/spar repairs. Authorised repair service for major insurance companies.
2. Refurbishment Services: Advanced race preparation, foil refurbishment, hull conditioning, paintwork, and lacquering services for racing and recreational vessels
3. New Design and Build Services: Bespoke design and manufacture services for class associations, commercial applications, industrial moulds, new build dinghies, and custom composite projects. Boats can be built up to 24m length.

Pricing tiers

Go-to-market motion1 record

Distribution channels2 records

Marketing channels4 records

Core offering

SM Composites designs, builds, repairs, and refurbishes composite marine structures including racing dinghies, sports boats, masts, spars, foils, and custom composite projects up to 24 metres in length. The company specialises in advanced materials (GRP, carbon fibre, wood) and serves individual racing sailors, class associations, professional racing campaigns, and superyacht mast builders. It is a Seldon approved repair and build centre and an authorised repair service for most major insurance companies.

Product overview

SM Composites is a composites workshop offering a unified service portfolio focused on the marine industry. The core offering consists of three interconnected service lines: Dinghy and Sports Boat Repairs (covering gel work, structural damage, and mast/spar repairs), Refurbishments (including advanced race preparation, foil refurbishment, hull conditioning, and paintwork), and New Designs/Boatbuilding (design and build services for composite projects up to 24m). The company also provides bespoke composite solutions for non-marine applications including road bikes, cars, and aircraft. Services are available for individual boat owners and class associations seeking new builders.

Differentiator

Problem solved

Functional benefit

Products and services

• Dinghy and Sports Boat Repairs

Quantifiable outcome

• 2018 Dinghy of the Year award with Flying Mantis design
• +4 more outcomes

Named customers7 records

Segments3 records

Ideal customer profiles3 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature5 records

Partnerships

Two partnerships are on record, tiered core.

• Major Insurance CompaniescoreChannel Partner/ Reseller/ DistributorAuthorised repair service for most major insurance companies. Customers with boat insurance can have repairs processed through their insurance provider and use SM Composites as the approved repair shop.
• SeldoncoreStrategic or Co-development PartnerSeldon approved repair and build centre. SM Composites is authorised to repair and build Seldon masts, spars, and related equipment. Seldon is a leading manufacturer of carbon fibre masts and spars for dinghies and sports boats.

Scale indicators3 records

Recent moves6 records

Expansion highlights5 records

Direct peers

• Magma Structures: UK-based specialist in large composite structures, most notably superyacht masts — Jamie Stewart previously led teams here building the Sailing Yacht A mast. Highly comparable on technology (advanced composites), customer base (premium marine / superyacht), and project scale.
• Ovington Boats: Established UK racing dinghy builder serving the UK and European sailing dinghy community. Comparable product line (racing dinghies and sports boats), materials expertise, and customer overlap with SM Composites' core dinghy repair and build business.
• Winder Boats: UK custom composite boatbuilder producing small craft using GRP and advanced composites. Comparable as a small-batch bespoke composite boatbuilder operating in a similar niche, though with different end-product positioning.
• Performance Sailcraft Europe: Manufacturer of the RS sailing dinghy range in the UK — SM Composites has produced 50+ RS800 hulls for the same class. Closest direct peer on product category (racing dinghies), customer base (RS class associations), and composite dinghy construction.
• Devoti Sailing: Composite dinghy and sports boat manufacturer known for performance-oriented builds. Comparable on materials (carbon fibre composites), product category (performance dinghies), and end customers (competitive sailing teams).
• Rondar Raceboats: UK-based racing dinghy builder producing classes including the K1, which SM Composites has also produced 50+ units of. Directly comparable on product (racing dinghies), materials (composite), and customer (class associations and competitive sailors).

Broad incumbents

• Green Marine: UK-based boat builder and refit specialist with composite construction capabilities. Overlaps with SM Composites on composite boatbuilding and repair services, but serves a broader range of vessels and customer segments.
• Hamble Yacht Services: Large established UK boatyard offering refit, repair, and maintenance across a broad range of yachts. Operates in the same marine MRO category as SM Composites but at significantly greater scale and across a wider vessel portfolio.
• Berthon Boat Company: Long-established UK boatyard providing new-build brokerage, repair, and refit services. Comparable as a marine services business serving yacht owners, though operating at a substantially larger scale and across more segments than SM Composites.

Others

• Selden Mast: Leading manufacturer of carbon fibre masts and spars — and the strategic partner whose approval SM Composites holds as an authorised repair and build centre. Directly connected through the Selden-approved channel rather than as a competitor.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat4 records

Key risks6 records

Key highlights6 records

Customer concentration

• Facebookfacebook.com/SM-Composites-103507091053685
• Instagraminstagram.com/smcomposites
• LinkedInlinkedin.com/company/sm-composites

Revenue estimate

Valuation estimate

Number of profiles

Profiles2 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 SM COMPOSITES LTD