Before any fire protection system can be commissioned, the design must be reviewed and approved by the authority having jurisdiction (AHJ). The exact name of the authority varies by country — a fire marshal, a building control body, a third-party notified body — but the core requirements are consistent: stamped drawings, a hydraulic calculation report, and a materials schedule with certified product listings.

Stage 1 — Design Review Submission: At this stage you submit the fire protection design drawings (AutoCAD or Revit-generated), hydraulic calculation report, materials list with UL/FM/VdS listings for all equipment, and a site plan. The drawings must show sprinkler layout, pipe sizing, hanger spacing, and clearance from obstructions. Calculations must be signed and stamped by a licensed PE or certified engineer. Missing any of these documents causes immediate rejection.

Stage 2 — Material and Product Approval: Before installation begins, the contractor submits product data sheets and approval certificates for every piece of equipment — sprinkler heads, pipe, valves, fire pumps, and alarm check valves. Most AHJs maintain an approved products list or require listings from a recognised certification body (UL, FM, VdS, LPCB). Submitting uncertified equipment is a common cause of delay.

Stage 3 — Rough-In Inspection: Inspectors verify that the installed piping matches the approved drawings, hangers are correctly spaced, and penetrations through fire-rated assemblies are properly sleeved and sealed. Any deviation from the stamped drawings — even minor reroutes — typically requires a formal drawing revision and re-submission.

Stage 4 — Final Inspection and Commissioning: The contractor performs a full hydrostatic pressure test, flush test, and alarm test witnessed by the AHJ. Fire pumps are run through their full performance curve. Under NFPA 13, the hydrostatic test is 200 psi for 2 hours (or 50 psi above working pressure, whichever is greater). Under EN 12845, the equivalent acceptance test follows the commissioning procedures of the design standard. Only after passing all tests does the authority issue the completion or occupancy certificate.

Working with an engineering partner who understands the local AHJ's submission format — and who can respond to technical queries in writing within 48 hours — significantly reduces the review cycle. Delivering a complete, coordinated package on the first submission is the single most effective way to keep a project on schedule.