As-Built BIM & COBie Digital Twin Handover: Asset Data, Scope & Fees

At practical completion, main contractors often hand over dusty boxes of PDFs and unverified design models that do not match what was actually built—blocking final retention release. SerMimar reconciles site redlines and laser checks into certified LOD 500 As-Built BIM models and error-free COBie 2.4 spreadsheets.

Engineered to LOD 500 / COBie Digital Twin precision across a reference benchmark of 5,000 – 150,000 m² under ISO 19650-3 · COBie 2.4 · IFC4 · UK Golden Thread, this canonical specification unifies spatial design, multidisciplinary clash resolution, and 5D cost certainty prior to site mobilization.

Structural Grid & Modular Alignment: Room and space boundaries reconciled to final partition positions with verified net leasable/maintenable floor areas.

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: Hierarchical Facility → Floor → Space → Zone → Asset Type → Component relational database structured per COBie 2.4.

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: Fire doors, access control readers, elevators, and emergency lighting tagged with commissioning certificates and inspection intervals.

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: Exact buried utility valve coordinates, manhole invert depths, and concealed isolation shut-off locations verified.

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: Pumps, backflow preventers, sprinkler zone valves, and calorifiers populated with serial numbers, flow rates, and spare-parts lists.

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: Installed chiller, AHU, VAV, and fan-coil assets linked to air-balancing commissioning logs and preventive maintenance schedules.

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: Final structural as-built geometry, floor live-load capacity maps, and post-tensioning / steel inspection records archived.

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: Facade glass replacement unit codes, gasket specifications, and cradle/anchor test dates embedded for safe facade cleaning.

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: 100% pass rate on Solibri/COBie QC Reporter checks ready for direct import into IBM Maximo, Planon, Archibus, or Autodesk Tandem.

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: Purged lightweight As-Built .RVT & .IFC4 FM Handover View models, validated COBie .XLSX/.XML workbook, and hyperlinked O&M PDF index.

Clients receive unlocked native Verified As-Built .RVT/.IFC4 + COBie Workbook + CAFM Asset DB 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 $11,000 – $27,500 (for 15,000 m² As-Built & COBie) (with indicative construction CAPEX benchmark at Cuts 25-Year OPEX Maintenance Costs by 8% – 15%). Accelerates contractor final retention release while saving facility operators thousands of hours hunting concealed valves and manuals.

DfMA Prefabrication & Export Execution Pathways: Stores exact replacement component SKUs and modular panel IDs for rapid lifecycle repairs.

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: BS EN ISO 19650-3 (Operational Phase), UK Building Safety Act Golden Thread, COBie UK 2012 / US NBIMS-V3, and Government Soft Landings.

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