Stax is the point of sale finance platform from Shermin Finance, built for home improvement and renewables retailers. One customer application, routed down a lender lineup configured for your business, with the decision landing live in your showroom. Rebuilt as Stax V3 on our own platform.
Since 1976. 220,000+ customers served. £750m+ originated. 250+ retail partners. 230,000+ Stax applications. Figures as at September 2026.
Sample data for illustration. Information for retail partners, not a consumer financial promotion.
Stax V3, live
We have rebuilt Stax on our own platform. Pages load in moments, there are fewer screens, and when you tell us something could work better, our own team changes it.
Sample data for illustration. Information for retail partners, not a consumer financial promotion.
Every application shows a Status and an Action side by side. If it says Customer Action, there is nothing for you to chase. If it says Retailer Action, it needs you.
The lender waterfall
Your customer completes one form. Stax sends it to a lineup configured for your business, typically a prime lender first with a specialist behind it, and reports each decision as it lands.
Replay on illustrative cases. Information for retail partners, not a consumer financial promotion.
Illustrative. Lenders shown by role, not by name. Information for retail partners, not a consumer financial promotion.
New on Stax: the Warm Homes Loan Scheme
The Warm Homes Loan Scheme is the Department for Energy Security and Net Zero's loan scheme for home energy upgrades: government support arrives as a cheaper interest rate on the customer's loan. It launches on Stax on 12 October 2026, Shermin Finance has worked closely with DESNZ on the scheme rules, and it is built into Stax. Air source heat pumps, solar PV and battery storage, for owner-occupiers and private landlords, on terms from 36 to 120 months.
Everything about Warm Homes on Stax
Loan caps below are the maximums in the Warm Homes Loan Scheme Rules, June 2026.
Scheme maximum. Information for retail partners, not a consumer financial promotion.
Scheme maximum. Information for retail partners, not a consumer financial promotion.
Scheme maximum. Information for retail partners, not a consumer financial promotion.
Caps apply per measure. Information for retail partners, not a consumer financial promotion.
How a Warm Homes loan is built
Stax deducts the declared grant from the product value before it sizes the loan, then applies the scheme rate reduction. The customer sees one monthly payment.
Worked example on illustrative figures. Information for retail partners, not a consumer financial promotion.
Move one. The Boiler Upgrade Scheme grant, declared at quote, comes off first. The loan is sized on what is left.
Move two. Government support arrives as a reduction to the loan's interest rate of up to 5 percentage points, so the customer sees a cheaper payment. Not a cash grant.
Move three. The payment lands. One figure, one agreement, signed electronically in the same journey.
Information for retail partners, not a consumer financial promotion. Illustrative, for demonstration only. Rates, eligibility and terms are set by the scheme lender. Loan caps and the rate reduction are as stated in the Warm Homes Loan Scheme Rules, June 2026.
Stax is the origination and processing platform for scheme loans. Lenders approved for the scheme fund and service them.
Scheme Rules, June 2026.
The record
Shermin Finance was founded in 1976, acquired by Homeserve in 2021 under Brookfield, and launched Stax in 2024. V3 is the platform we built because nothing off the shelf ran finance the way our own desk did.
Figures as at September 2026.
Shermin Finance founded, brokering home improvement finance from the West Midlands.
Acquired by Homeserve, under Brookfield ownership.
Stax launched as Shermin's own origination platform.
Stax V3 rebuilt on our own cloud platform. Warm Homes Loan Scheme finance launches 12 October 2026.
Thirty minutes with the team who built it, on the portal your team would use, with demonstration data.