Donaldson Timber Systems achieves BOPAS Plus


Donaldson Timber Systems (DTS) becomes one of the first manufacturers to achieve Buildoffsite Property Assurance Scheme Plus (BOPAS Plus)

BOPAS Plus is a durability assessment for advanced, offsite build systems and focuses on the preparedness of the offsite sector to drive digitisation and collaboration in the construction industry.

BOPAS is the industry benchmark to demonstrate to funders, lenders, valuers and purchasers that homes built using offsite will have a life of at least 60 years.

The accreditation process involves a rigorous assessment, including a two-stage review;

  • a detailed interview with Lloyds Register
  • and a full day audit, where the business is required to provide evidence on the plans in place to deliver on its five-year plan.

DTS is one of three UK businesses to achieve BOPAS Plus

Donaldson Timber Systems (DTS) is one of only three businesses in the UK to hold the new accreditation.


The DTS Sigma® II system, was one of the first offsite build systems originally to be accredited by BOPAS in 2013.

DTS Sigma® II build system

Rod Allan, managing director, Donaldson Timber Systems said: “BOPAS plus is a fantastic achievement for the business, and will help to ensure that we have a clear differentiator when promoting our Sigma® II build system to the market.

“An increased use of our Sigma® II system will reduce the energy required by customers to run their homes, as well as very low embodied carbon from the construction of the home. BOPAS plus will help to provide our clients and the industry with the confidence that our system has been thoroughly assessed and is highly durable.”

Greater uptake in modern methods of construction in the coming years

Andrew Donaldson, CEO of the Donaldson Group added: “We expect to see a much greater uptake in modern methods of construction in the coming years and anticipate the demand for offsite construction will continue to increase to help address the housing crisis and the drive for net zero.

“This accreditation further demonstrates the integrity of the offsite method and its longevity. It’s not just a positive for Donaldson Timber Systems and the wider Donaldson Group, but for the offsite sector as a whole.”


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