LOD 350 4-Discipline Federated BIM Coordination: Interfaces, Clearances & Fees

LOD 350 Multidisciplinary BIM Coordination resolves the critical physical interfaces between all four building systems—modeling secondary steel supports, MEP trapeze hangers, fire-damper access zones, and builder’s work openings (BWIC) before tender.

Engineered to LOD 350 precision across a reference benchmark of 5,000 – 35,000 m² under ISO 19650-2 · RIBA Stage 4 · BIM Forum LOD 350, this canonical specification unifies spatial design, multidisciplinary clash resolution, and 5D cost certainty prior to site mobilization.

Structural Grid & Modular Alignment: Coordinated structural and ceiling grid alignment locking diffuser, sprinkler head, luminaire, and curtain-wall mullion centerlines.

Primary column grids, facade mullion subdivisions, and subterranean parking geometry are locked onto a unified datum—eliminating non-standard off-cuts and costly site framing adjustments.

Spatial Program & Net-to-Gross Efficiency: Verified net clear ceiling heights (e.g., ≥2,750 mm offices, ≥3,200 mm lobbies) preserved after full multi-tier MEP duct/tray stacking.

Live parametric Revit area schedules track net usable/leasable floor area against vertical cores, MEP plantrooms, and envelope wall thickness at every design iteration.

Vertical Cores, Logistics & Life-Safety Egress: Corridor plenum cross-sections engineered at 1:20 scale with dedicated vertical zones for supply/return air, cable containment, and fire mains.

Travel distances, pressurized stair cores, ADA/accessible routing, and heavy service/loading dock swept-path geometry are validated against NFPA, EN, and local building regulations.

Subsurface Utilities, Drainage & Wet Shafts: 100% locked Builder’s Work in Connection (BWIC) structural wall/slab penetration drawings with fire-collar and acoustic sleeve schedules.

Gravity stormwater and foul drainage stacks are modeled with true 1.5%–2.0% invert slopes, locking structural beam web penetrations and acoustic riser sleeves before rebar detailing.

Domestic Plumbing, NFPA/EN Sprinkler & Hydronics: Sloped cast-iron/HDPE drainage stacks, condensate traps, and NFPA 13 sprinkler branch lines coordinated around structural gussets.

Wet/dry sprinkler grids, fire hose cabinets, booster pump skids, and hydronic manifolds are spatially coordinated above ceiling plenums without compromising architectural clear heights.

HVAC Routing, Acoustics & Zero-Clash Verification: Full duct insulation thickness, valve actuator clearance, and VAV/FCU filter pull-out maintenance envelopes verified clash-free in Navisworks.

Automated Navisworks and Solibri rule-sets enforce ±3 mm hard-clash tolerances and 25–50 mm insulation/maintenance clearance zones, closing 100% of BCF issues prior to tender issue.

Structural Framing & Seismic Engineering: Baseplates, shear tabs, secondary facade support steel, lintels, and rebar congestion zones coordinated against embed plates.

Inter-story seismic drift ratios, ductile steel moment/braced connections, foundation punching shear, and secondary facade subframes are signed off by our senior structural engineering partners.

Building Envelope & Hygrothermal Physics: Slab-edge curtain-wall anchor embeds, perimeter fire-stop mineral wool safing, and parapet waterproofing upstands resolved in 3D.

2D/3D thermal-bridge condensation risk is audited per EN ISO 6946, pairing Class A1 mineral-wool insulation, vapor-permeable membranes, and slotted seismic facade brackets at 1:5 shop detail scale.

Georeferenced Masterplan & ISO 19650 CDE: Weekly ISO 19650 federated model publication (.NWD / IFC4) with tracked BCF issue resolution logs across all 4 disciplines.

All discipline models share true survey coordinates (UTM / National Grid) and progress through ISO 19650 WIP → Shared → Published gates inside the Common Data Environment.

Native BIM & Construction Documentation Package: 4 native Revit discipline models, federated Navisworks (.NWD), zero-clash BCF audit certificate, BWIC penetration set, and 1:50 / 1:20 CDs.

Clients receive unlocked native Federated .RVT · .IFC4 · .NWD · BCF Audit · .DWG source files, plotted PDF/DWG construction sets, and signed zero-clash audit certificates.

5D Quantity Take-Off (BoQ) & Indicative Studio Fee: The indicative engineering & BIM fee band for this reference scope is $26,500 – $48,000 (for 10,000 m² ref.) (with indicative construction CAPEX benchmark at $12.0M – $18.5M Construction Ref.). Eliminates 92–98% of on-site MEP/structural RFI change orders, typically saving 4% to 7% of total construction CAPEX.

DfMA Prefabrication & Export Execution Pathways: Enables pre-corrugated slab sleeves and modular pre-assembled corridor MEP racks ready for fast-track installation.

Clients may tender the open BIM package to any local contractor or leverage our integrated group factories (SerBuild steel structures, SerMimar İskele EN 12810 scaffolding, SerMimar Şömine hearths, and SerSourcing 40HC consolidation).

International Codes, Sustainability & Compliance: Compliant with UK ISO 19650 RIBA Stage 4 Technical Design, Dubai Municipality LOD 350 Mandate, and HOAI LP 5.

Structured directly for LEED / BREEAM / RE2020 energy modeling, UK Building Safety Act Golden Thread compliance, Eurocode National Annexes, and institutional lender due diligence.