IPEX prevents your payments from being used to cashflow other project/s linked to your builder – only subcontractors and suppliers working on your project can be paid out of the project account.
Making any agreement to contribute additional funds conditional on the use of IPEX is the safest way forward. By agreeing, builders are confirming that their request is genuine (a payment through IPEX doesn’t help their position on any other project), whilst developers gain transparency and certainty over how funds are spent for the remainder of the project.