Diack and Macaulay Ltd

What Diack and Macaulay Ltd does

Diack and Macaulay Ltd is a privately held, family-run civil engineering and infrastructure contractor headquartered in Moodiesburn, Chryston (Glasgow), United Kingdom. Established in 1980, the firm employs approximately 14 people and operates across Scotland and northern England. Its core service portfolio covers bridge deck expansion joints (including Type 5 and Mageba Polyflex joints), structural repairs and refurbishments (concrete repairs, bridge and masonry refurbishment), highway safety fencing and parapet systems (road restraints), traffic management (including contraflows, high-speed road management, and event traffic management), structural waterproofing, and precast concrete solutions for bridge and civil engineering applications.

The company generates revenue through project-based contracts awarded by Scottish local authorities, government-funded bodies (notably BEAR Scotland/Transport Scotland and Transport Scotland), and a small number of commercial contractors (Raynesway Construction, Tarmac National Contracting, Lanarkshire Welding Company). Named public sector clients include North Lanarkshire Council, East Dunbartonshire Council, West Lothian Council, Argyll and Bute Council, Aberdeen City Council, Aberdeenshire Council, Highland Council, Renfrewshire Council, Dumfries and Galloway Council, Inverclyde Council, East Ayrshire Council, and Perth and Kinross Council. Pricing is not publicly disclosed; the firm engages clients via direct phone contact (01236 875166), its website enquiry form, and direct project tendering.

Its go-to-market is sales-led and relationship-driven, with no e-commerce or self-serve channel. The firm's competitive positioning rests on a 40+ year operating history, ISO 9001:2015 and ISO 14001:2015 certified management systems, and pre-qualification accreditations (CHAS, Constructionline, NHBC, SSIP, CITB, CECA) required for UK public sector procurement. Recent strategic activity has focused on broadening the in-house service offering (waterproofing, precast concrete, dedicated D&M Traffic Management sub-brand) and technical differentiation such as the first Scottish trial of the Mageba Polyflex noise-reducing bridge joint on the A9 at Dunbeath. Revenue is not publicly disclosed and no external funding, M&A, or leadership changes are recorded in the source material.

Name

Diack and Macaulay Ltd

Legal name

Diack & Macaulay Ltd

Website

https://diackandmacaulay.co.uk

Company type

Private

Founded year

1980

Operating status

Operating

Headcount range

11–50 employees

Short description

Diack and Macaulay Ltd is a privately held, family-run civil engineering and infrastructure contractor in Scotland, delivering bridge repairs, expansion joints, road restraints, traffic management, structural waterproofing and precast concrete services to local authorities, BEAR Scotland and government contractors.

Ownership category

akta.pro rank

Headquarters

HQ city

Moodiesburn, Chryston

HQ country

United Kingdom

HQ region

Europe

Offices1 record

Markets served

GTM type

B2B

Offering type

Services

Cost components

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

Revenue model

1. Civil Engineering and Infrastructure Contracts: Project-based revenue from delivering civil engineering works including bridge construction, structural repairs, refurbishments, waterproofing, precast concrete, and highway safety fencing contracts for government and commercial clients.

Go-to-market motion1 record

Distribution channels1 record

Marketing channels3 records

Core offering

Diack & Macaulay Ltd is a family-run civil engineering contractor delivering bridge construction, structural repairs and refurbishments, bridge deck expansion joints, highway safety fencing and parapets, structural waterproofing, precast concrete solutions, and traffic management services. The firm primarily serves UK local authorities, trunk road operators, and government-funded bodies across Scotland and northern England under project-based contracts.

Product overview

Diack and Macaulay Ltd is a civil engineering company offering a unified portfolio of infrastructure services. The core offerings include Bridge Deck Expansion Joints, Structural Repairs & Refurbishments, Road Restraints, and Traffic Management. In recent years, the company has expanded its portfolio to include Structural Waterproofing and Precast Concrete Solutions, broadening its service capabilities for bridge and civil engineering projects across Scotland and northern England.

Differentiator

Problem solved

Functional benefit

Products and services

• Bridge Deck Expansion Joints

Named customers18 records

Segments1 record

Ideal customer profiles2 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Scale indicators3 records

Recent moves6 records

Expansion highlights6 records

Broad incumbents

• Morgan Sindall: UK construction and infrastructure group with significant civils and highways business. Comparable activities in bridgeworks and local authority infrastructure but at substantially greater scale.
• Balfour Beatty: One of the largest UK infrastructure groups, with major exposure to highways, bridges, and rail civils. Operates as a broad incumbent in the same space as D&M and competes for many of the same Scottish road and bridge framework contracts.
• John Graham Construction: UK and Ireland construction and civil engineering contractor with major infrastructure, highways, and bridges portfolio. Comparable in core civil engineering offering but materially larger and capable of taking on larger framework contracts.
• McLaughlin & Harvey: Northern Ireland-headquartered civil engineering and building contractor operating across the UK and Ireland on transport, infrastructure, and commercial projects. Comparable capabilities but larger scale and broader geographic footprint than D&M.
• VolkerWessels UK: UK civil engineering contractor delivering highways, bridges, and rail infrastructure. Overlapping capabilities with D&M in bridge construction and refurbishment, but typically operating on larger contracts.

Direct peers

• RJ McLeod: Scotland-based civil engineering contractor with services spanning roads, bridges, utilities, and infrastructure for councils and public bodies. Directly comparable in scope, geography, and reliance on Scottish public sector clients.
• Knights Brown: UK civil engineering and construction contractor focused on bridges, highways, and coastal infrastructure for public bodies. Comparable in core offering (bridge refurbishment, structural works) and customer base.
• I&H Brown: Scottish civil engineering contractor providing civil, infrastructure, marine, and build services to public and private clients. Comparable as a similarly sized regional contractor operating in Scotland with overlapping services.
• Pat Munro Construction: Scottish-based civil engineering contractor delivering infrastructure, bridges, roads, and groundworks for local authorities and utility clients. Highly comparable as a similarly-sized regional contractor with a similar public-sector customer mix.
• Clancy Group: UK contractor delivering civil engineering, infrastructure, and utility services (water, gas, electricity) with extensive public-sector and framework presence. Comparable as a mid-sized multi-disciplinary civil engineering contractor serving UK public bodies.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat3 records

Key risks6 records

Key highlights6 records

Customer concentration

• Facebookfacebook.com/diackandmacaulayltd
• LinkedInlinkedin.com/company/diack-and-macaulay-ltd

Compliance7 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 Diack and Macaulay Ltd