WSP has acquired UK building services consultancy Hulley & Kirkwood, adding approximately 122 engineers and specialists across seven offices and expanding its mechanical, electrical, and public health engineering capability.
Founded in 1953, Hulley & Kirkwood has a particularly strong presence in Scotland and works across healthcare, defence, commercial, education, and government projects. The business will join WSP’s UK operation through a structured integration programme intended to maintain client continuity while combining its building services expertise with WSP’s wider engineering, infrastructure, and environmental capabilities.
The acquisition strengthens WSP’s Property and Buildings business as building services design carries a growing share of project complexity. Mechanical and electrical systems now sit directly across energy performance, low-carbon heat, ventilation, resilience, digital control, fire and life-safety interfaces, and increasingly demanding operational requirements in sectors such as hospitals and defence facilities.
Paul Reilly, president and managing director for the UK and Ireland at WSP, said Hulley & Kirkwood brings “a strong technical reputation, deep sector expertise and an established regional presence”. The deal also gives WSP a larger specialist team in Scotland while adding capacity across the wider UK market.
Hulley & Kirkwood’s mechanical, electrical, and public health work complements multidisciplinary design rather than duplicating civil or structural engineering. On complex buildings, coordination between those disciplines determines plant space, service routes, structural penetrations, electrical capacity, maintainability, and the sequence in which systems can be installed and commissioned.
Bringing more of that work into one organisation can reduce interface risk, although successful integration still depends on retaining specialist knowledge and clear accountability. Large multidisciplinary consultancies can coordinate more design packages internally, but the benefit disappears if technical decisions slow down or local project knowledge is lost during integration.
WSP employs more than 12,100 people across the UK and Ireland and about 83,000 globally. The scale difference between the two businesses is substantial, making retention of Hulley & Kirkwood’s local project relationships and technical culture one of the practical issues to manage. WSP says the integration process will preserve continuity while opening opportunities for collaboration and growth.
Healthcare illustrates why specialist building services capability can be difficult to replace quickly. Hospitals can require resilient power arrangements, extensive ventilation and filtration, specialist medical systems, domestic water controls, and tightly managed maintenance access. Refurbishment programmes often have to be delivered while clinical operations continue, increasing the importance of sequencing and coordination.
Defence projects add different requirements around security, resilience, continuity, and mission-specific systems. Integrating those services with structures, architecture, and civil infrastructure rewards multidisciplinary coordination, but it also raises the cost of errors when interfaces are missed or changes are introduced late.
The transaction reflects a wider consolidation pattern in professional engineering services. Clients commissioning major infrastructure, healthcare, defence, and public-sector programmes increasingly require combinations of design, advisory, sustainability, digital, and delivery capability. Larger consultancies can assemble those disciplines across regions, while specialist businesses bring sector experience and client relationships that take years to build organically.
Scale does not remove the technical pressure on the sector. UK building services teams face persistent competition for experienced electrical, mechanical, controls, and sustainability engineers, while workloads are being reshaped by electrification and tighter performance requirements. Projects that once treated power and mechanical plant as supporting packages can now depend on them for energy strategy, resilience, and compliance from the earliest design stages.
Digital engineering also increases the amount of coordination expected before construction begins. Building information models, clash detection, energy modelling, controls integration, and asset information can improve delivery, but each depends on disciplined technical input. Acquiring an established building services team gives WSP additional people able to work inside those processes without building the capability solely through recruitment.
Financial terms of the acquisition have not been disclosed. That keeps the industrial significance centred on capability rather than transaction value: WSP is adding a defined group of building services engineers, sector knowledge, and regional coverage at a point when technically complex, energy-intensive, and resilient buildings are demanding more engineering input.
The longer-term value will depend on retaining senior specialists, integrating design systems and quality processes, and giving local teams access to WSP’s broader disciplines without slowing decisions. Engineering consultancies ultimately sell technical judgement and delivery capacity, making continuity after acquisition as important as completing the transaction itself.
