The survey of main contractors, SME builders, civil engineering firms, product manufacturers and specialist contractors found that all reported increases in sales, output and workloads in the quarter driven by increased demand.

Notably however, order books were sustained by private housing and R&M work, but fell in sectors such as commercial and industrial. This was echoed throughout the supply chain, with net balances weakening for enquiries, orders and expected sales among SMEs, civil engineering contractors and product manufacturers in comparison to to Q1.

After sterling’s depreciation since the EU Referendum, the strongest cost pressures for the construction industry have been rising prices for imported materials. 88 percent of main contractors, 87 percent of heavy side manufacturers and all light side manufacturers reported a rise in the cost of raw materials in Q2.

In spite of this, however, almost half of main contractors and specialist contractors opted to keep tender prices unchanged, leading to a fall in margins.

Commenting on the survey, Rebecca Larkin, senior economist at the CPA, said: “This was the seventeenth consecutive quarter of growth for the construction industry, but a cautious stance over future expectations is not surprising. Another quarter of slow GDP growth, rising costs and a near-term outlook clouded by Brexit uncertainty have led to a fall in orders in privately-financed sectors such as commercial and industrial, and this pessimism has also spilled over into infrastructure.   

She continued: “Perhaps more conspicuous in the survey data is the squeeze on margins for main contractors and specialist contractors. Strained margins had already been acute for some time given skills shortages pushing up construction wages. Now there’s the added pressure of contractors trying to avoid or delay passing on the full cost of higher raw materials prices to clients when tendering for upcoming construction projects.”

Brian Berry, chief executive of the Federation of Master Builders (FMB), commented: “Despite rising material prices and a period of political uncertainty, it is encouraging to see the SME construction sector continuing to grow. The industry is demonstrating significant resilience, especially when we consider difficulties in recruiting key trades such as bricklayers and carpenters, and shortages in other trades, such as plumbers and plasterers.

Mr Berry acknowledged: “There are real challenges ahead for the sector. The possibility of Brexit exacerbating already severe skills shortages and the continuing upward pressure on wages and salaries this brings, means construction SMEs will be cautious in their optimism.”

Richard Beresford, chief executive of the National Federation of Builders (NFB), added: “Although SMEs have found more work, project viability seems to be increasingly stifled by spiralling material costs. Construction SMEs are reporting a tightening of profit margins, which may impact productivity in the coming 12 months.

“The NFB’s house building members appear more confident about their immediate future, despite not having an assured work pipeline. The Government must enable constructors - particularly SMEs - to establish a pipeline of work either through more streamlined procurement or by reforming the planning process.

“However, the weakening pound shows that, in the long term, constructors either need improved access to material markets or short-term financing for project completions. The Government must deal with the impact of a weaker exchange rate and Brexit more urgently. It must work with industry to understand and navigate more unpredictable and potentially difficult times.”