LOD 300 Architectural & Structural BIM Modeling: Geometry, Permits & Fee Benchmarks

LOD 300 Architectural & Structural BIM converts conceptual sketches or 2D CAD drawings into dimensionally verified 3D building elements—establishing exact wall thicknesses, floor-to-floor heights, structural slab edges, and statutory area schedules.

Engineered to LOD 300 precision across a reference benchmark of 2,500 – 15,000 m² under ISO 19650 · AIA G202 LOD 300 · RIBA Stage 3, this canonical specification unifies spatial design, multidisciplinary clash resolution, and 5D cost certainty prior to site mobilization.

Structural Grid & Modular Alignment: Primary structural axes (6.0 m – 8.4 m typical spans) aligned with subterranean parking bays and vertical elevator/stair cores.

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: Gross-to-net floor efficiency audited via live Revit Area Plans, locking statutory FAR/massing envelopes and compartment boundaries.

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: Code-verified corridor widths, stair riser/tread geometry, ramp gradients (≤8%), and maximum fire travel distances.

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: Dedicated vertical wet risers and primary roof rainwater outlets sized and reserved inside structural slab zones.

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: Fire pump room footprint, water tank volumes, and main riser shafts spatially locked for authority submission.

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: Primary mechanical plantrooms, roof AHU/chiller zones, and main vertical shaft clear-openings reserved with zero structural conflict.

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: Preliminary finite-element sizing of RC columns, shear walls, foundations, and primary steel girders per Eurocode / TBDY 2018.

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: Multi-layer exterior wall and roof types defined with target thermal transmittance (U-values) and glazing window-to-wall ratios.

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: Georeferenced site topography, property setbacks, and shared survey coordinates configured per ISO 19650-2.

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: Clean workshared Revit (.RVT) architectural and structural models, IFC4 Reference View exports, and 1:100 / 1:50 permit drawing sets.

Clients receive unlocked native .RVT · .IFC4 · 2D Permit .DWG / PDF 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 $11,500 – $22,000 (for 5,000 m² ref.) (with indicative construction CAPEX benchmark at $6.0M – $9.2M Construction Ref.). Provides elemental quantity schedules (m² facade, m³ concrete, gross floor plates) achieving ±8% early cost-plan accuracy.

DfMA Prefabrication & Export Execution Pathways: Establishes modular structural bay repeatability early so downstream LOD 350/400 prefabrication proceeds without grid redesign.

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: Full alignment with RIBA Stage 3 Spatial Coordination, German HOAI LP 3–4, AIA Design Development, and municipal zoning codes.

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