Accreditation
Accredited, so your home is mortgageable.
BOPAS accreditation is what makes a modular home mortgageable. It is the scheme lenders, valuers and warranty providers look to for independent evidence that an offsite-built house will still be performing in sixty years.
BOPAS
Accredited system, continuously evaluated
60 years
Durability assessment
ISO 9001:2015
Quality managed factory
Class A1
Non-combustible insulation
The scheme
Independent assurance, not a self-declaration
Accreditation covers the manufacturer and the building system together, and is held through continuous evaluation rather than granted once.
What BOPAS is
The Buildoffsite Property Assurance Scheme accredits the quality and durability of offsite-constructed property. It is run with the Royal Institution of Chartered Surveyors and backed by Lloyd’s Register, and it assesses the manufacturer and the system, not one finished house.
How it validates our homes
Accreditation is granted on assessment and held through continuous evaluation, covering design, the production process and the factory’s quality management. It is a standard to keep meeting rather than a certificate to hang on a wall.
Why it matters to you
Lenders are cautious about non-traditional construction. BOPAS accreditation is recognised by the major banks, so a Trident home can be mortgaged, valued and resold on the same terms as a brick-built one.
Materials
What the accreditation rests on
An assessment of durability is an assessment of what a building is made from. These are the materials specified in every Trident build-up.
C24 structural timber
Calibrated, planed and kiln-dried softwood at 12–15% moisture content, so the frame behaves predictably under load and does not move after assembly.
Basalt wool insulation
Non-combustible to Class A1, from 100 mm up to 200 mm within the frame plus a 50 mm counter-insulated layer that breaks the thermal bridge through the studs.
Juta membranes
A breather membrane outside the insulation and a vapour control membrane inside it, so the build-up manages moisture in both directions across the life of the building.
OSB-3 sheathing
Load-bearing board rated for humid conditions, acting as the stiffening diaphragm that gives each panel its racking strength.
Mortgages
Getting a mortgage on a modular home
Lenders class timber-frame and factory-built houses as non-standard construction, and a valuer will ask how the building was made and who stands behind it. The BOPAS accreditation answers that question: it is the scheme the major UK banks and building societies recognise for offsite construction, with a durability assessment of sixty years, so a Trident home is assessed on the same terms as a brick-built one.
What the lender sees
The BOPAS certificate for the manufacturer and the building system, the ISO 9001:2015 certificate for the factory, and the technical documentation for the build-ups.
Self-build and stage payments
A house bought as a shell is usually funded with a self-build mortgage released in stages. The purchase options on each model page map onto those stages: shell, weathertight, fit-out.
Garden rooms and annexes
A garden building is not mortgaged on its own. Buyers typically use savings, a further advance on an existing mortgage or specialist finance; we can recommend providers.
Every model's from-prices across the three purchase options are in the price guide; the self-build page covers VAT on a new dwelling.
Need our certificates for a lender?
We can send the BOPAS accreditation and ISO certification straight across, along with the technical documentation a valuer or warranty provider will ask for.