NATIONAL PLUMBING CODE Philippines · RA 1378
The Revised National Plumbing Code of the Philippines governs all plumbing work in the country. This visual reference breaks down each chapter into clear rules, key dimensions, and illustrated diagrams — making the code readable for master plumbers, architects, civil engineers, and building officials.
Visual references for Philippine plumbing compliance — covering permits & RLMP requirements, pipe grades & fittings, water supply sizing, excreta drainage & DFU, vents & venting, traps & interceptors, septic tanks, storm drainage, and more — all based on RA 1378, NPC 2000 Edition.
Based on the Revised NPC (2000 Edition) under Republic Act No. 1378. Always verify against the official code for permit submissions.
Chapters
Grade ≤75mm
Requirement
Trap Seal
Permit App.
Why NPC Compliance Matters
Missing an NPC requirement can directly cause:
AEDO simplifies complex NPC requirements into practical visual references for real construction projects — and provides expert plumbing engineering services when you need professional support. Contact AEDO →
- Permit requirements & who can apply
- Plans signed & sealed by RLMP (6 sets)
- Inspection types & inspector qualifications
- Connection approval — permanent & temporary
- Searchable glossary of all plumbing terms
- Trap, trap arm, trap seal defined
- Drainage, vent & supply system terms
- Fixture unit, branch interval, grade
- Pipe grade: 2% for ≤75mm, 1% for >75mm
- Acceptable fittings for direction changes
- Rodent proofing at pipe penetrations
- Approved pipe materials & standards
- Fixture material & surface requirements
- Clearances: 750mm front, 150mm side (WC)
- Floor drain trap seal & strainer standards
- Minimum fixtures by occupancy — full table
- Rough-in & final inspection stages
- Water test & air test on the DWV system
- Maintenance & existing construction
- Health & safety responsibilities
- Cross-connection control & air gap requirements
- Pipe sizing by Water Supply Fixture Units (WSFU)
- PRV required when pressure > 551 kPa
- Shower/tub control valve max 48.88°C
- DFU values for every fixture type
- Horizontal branch & stack sizing tables
- Building drain sizing by grade
- Changes of direction & cleanouts
- Air gaps & air breaks for indirect waste
- Food, sterile & clear-water equipment
- AC condensate & clothes-washer standpipes
- Swimming pool & refrigeration wastes
- Why venting protects trap seals
- Max trap-to-vent distances
- Individual, wet, common & circuit vents
- AAV rules & yoke vents for high-rise
- Trap seal depth: 50–100mm required
- Prohibited traps (S-trap, drum, running)
- Grease, oil & sand interceptors
- Backwater valves for below-grade drainage
- Roof drain sizing by rainfall intensity
- Leaders, conductors & area drains
- Storm & sanitary separation requirement
- Subsoil drainage & sump pumps
- Public-sewer connection & 61m availability rule
- Materials, under-slab & 1.5m/0.6m clearances
- Min 102mm size & 2% slope matrix (Table 12-2)
- Water-pipe trench isolation & abandoned sewers
- Gas/watertight joints & reaming
- Caulked, threaded, wiped, soldered & solvent joints
- Connecting dissimilar materials (adapters/unions)
- Slip/expansion & prohibited joints
- Factory marking & material quality (Table 14-4)
- Copper types & color-stripe codes (K/L/M/DWV)
- Ferrule & bushing tables (14-1, 14-2)
- Closet rings, cleanouts & drainage valves
- Septic tank sizing by fixture-unit load
- Setback distances from structures & wells
- Absorption field design & soil percolation
- Dosing chambers & subsurface disposal
- Fire Department Connection (FDC) & Siamese
- Fire Hose Connection (FHC)
- Post Indicator Valve (PIV)
- FDC for standpipe Classes I–V
Beyond the Code — We Actually Build
AEDO Construction doesn't just explain NPC requirements. We apply them in actual projects — from permit drawings to site turnover.
From planning to actual construction — NPC-compliant, permit-ready, and buildable.
Common NPC Mistakes in Construction
AEDO provides visual references and practical guidance to help you avoid costly NPC compliance mistakes on-site.
Engineering Tools for Real Construction Workflows
AEDO Engineering Apps are built for Philippine construction — by engineers, for engineers, contractors, estimators, and project managers.
Why Professionals Use AEDO
Need Help With NPC Compliance?
Whether you're preparing permit documents, reviewing plumbing plans, designing drainage systems, or verifying code requirements — AEDO can help simplify the process.
Need a structure that's code-compliant by design?
This NPC reference is built and maintained by AEDO Construction OPC — a Philippine design-build firm where every plumbing drawing meets NPC 2000, NSCP 2015, and the Fire Code before it ever reaches your site. Engineers, architects, and own-tool builders under one roof.
Design & Build · End-to-End
From blueprint to turnover — one accountable team, one contract, one fixed price.
Design Plans, Drawings & Specs
Architectural floor plans, plumbing drawings, structural plans, and BOQ — drawn against current code from day one.
- Plumbing & sanitary plans
- Structural drawings (NSCP 2015)
- Bill of quantities
Structural Analysis & Design
Rigorous engineering — value engineering, design optimization, and forensic investigation of existing structures.
- NSCP-compliant design
- Seismic & wind analysis
- Structural investigation
Construction & Management
Full-scope construction & project management for architectural, structural, and interior fit-out — delivered safely, on schedule.
- Architectural construction
- Structural works
- Interior fit-out
Mobile Tools for the Field
Purpose-built Android apps used by engineers, contractors, and students nationwide.
Full NSCP 2015 reference: minimum design loads, wind calculator (§207A-207B), seismic base shear (§208), concrete, steel & foundation design — all in your pocket.
Estimate construction unit costs with editable material, labor, equipment & productivity rates. 10+ activities from excavation to gates — calibrated to local Philippine market prices.