Leaving site testing late can create avoidable programme pressure where drainage decisions are already critical.

Site location, proposed drainage context and access details help plan an infiltration testing visit.

Infiltration testing provides site-specific evidence to help drainage design and planning decisions.

Accurate addresses, plot numbers, site contacts and realistic readiness dates make booking more efficient.

Developers, site managers and contractors commonly coordinate air tightness testing.

Turnaround depends on readiness, location, access and the number of units involved.

Smaller developments can still need testing where compliance and sign-off require it.

Testing usually works best once the dwelling is close to final condition and ready for a meaningful result.

Testing and SAP often sit close together in the wider compliance route for residential projects.

If a plot fails, the practical next step is to review likely leakage points and plan a retest efficiently.