Engineering approach
Integrated MEP design anchored in coordinated Revit models, calculation-led sizing and documented design intent — reducing rework, site variations and late-stage redesign.
Accurate design means MEP systems are sized, routed and documented from validated calculations and coordinated spatial models before construction issue. Mechanical, electrical, public health and fire protection disciplines share a single source of truth that reflects agreed design criteria, code requirements and client performance targets.
Model-first delivery replaces fragmented 2D iteration with governed model updates at defined LOD milestones. Each discipline maintains authoring responsibility while federation exposes interface conflicts early — when resolution cost is lowest and design alternatives remain viable.
High-rise, healthcare, data centre and mixed-use projects carry dense service zones, strict clearance requirements and multi-party design interfaces. Inaccurate early assumptions propagate into costly site variations, procurement delays and commissioning failures. Accurate design establishes traceable links between engineering calculations, model geometry and issued documentation.
Clients gain predictable design outcomes: coordinated models that align with calculations, specifications and procurement packages. Contractors receive constructible information with defined tolerances, reducing RFIs and rework. Facility teams inherit models structured for operation, maintenance access and lifecycle data continuity.
Accuracy is verified through model audits, calculation registers and cross-discipline review gates — not assumed from visual inspection alone. Design changes flow through controlled revision with impact assessment on adjacent disciplines, quantities and programme.
Record thermal, electrical, hydraulic and fire performance criteria as controlled inputs.
Apply calculation templates to establish plant, riser and distribution capacities.
Route services in federated models with defined clearance and access rules.
Develop LOD 300–400 models with equipment selections and connection logic.
Issue drawings, schedules and specifications derived from approved models.
Assess revision impact across disciplines before model and document re-issue.
Validate model currency against latest architectural and structural revisions.
Confirm model attributes required for commissioning and asset data transfer.
Revit MEP authoring models carry calculation references, system classifications and element identifiers aligned to project naming conventions. Federation in Navisworks or equivalent platforms exposes discipline interfaces without overwriting source models. openBIM exchange via IFC supports quantity extraction, third-party review and client CDE requirements.
LOD targets are agreed per milestone in the BIM execution plan. Geometric accuracy, alphanumeric completeness and documentation links are verified before milestone sign-off. SEINZEN maintains discipline-specific model audit checklists mapped to ISO 19650 information delivery milestones.
Accurate design requires simultaneous consideration of structural penetrations, architectural ceiling zones, facade interfaces and vertical transportation cores. MEP routing decisions are evaluated against maintenance access, future flexibility and energy performance — not isolated discipline optimisation.
Workshops with architecture, structure, interiors and specialist consultants resolve interface ownership before detailed documentation. Integrated design reduces the false precision of uncoordinated 2D layouts that appear complete but fail on site.
HVAC, electrical and hydraulic loads derived from documented methods with version-controlled inputs.
Plant, riser and branch zoning aligned to fire compartments, tenancy splits and maintenance strategy.
Documented minimum clearances for insulation, brackets, testing access and future replacement.
Structural opening requests tracked with load assessment and fire-stopping implications.
Modelled equipment linked to datasheet, capacity and electrical load references.
Model elements mapped to specification clauses and performance standards.
Narrative design intent for complex systems supporting contractor interpretation.
Structured review of downstream effects before accepting design changes.
Primary plant and risers
Distribution systems
Equipment and terminals
| Milestone | Element | Purpose | Responsible | Geometric | Alphanumeric | Documentation | LOD / LOIN | Control | Acceptance |
|---|---|---|---|---|---|---|---|---|---|
| Concept design | Primary plant and risers | Validate spatial feasibility | Lead MEP engineer | LOD 200 routing envelopes | System ID, design capacity | Concept layout drawings | LOIN 2 — spatial planning | Federation review | Agreed concept routing |
| Design development | Distribution systems | Coordinate ceiling void services | Discipline leads | LOD 300 coordinated geometry | Flow rates, cable sizes | Coordination model export | LOIN 3 — coordination | Model audit checklist | Signed coordination cycle |
| Technical design | Equipment and terminals | Issue procurement-ready information | MEP modellers | LOD 350–400 detail | Tag, classification, COBie fields | Schedules and specifications | LOIN 4 — procurement | QA review gate | Approved for construction issue |
ISO 19650
buildingSMART IFC
ASHRAE Guideline 36
CIBSE Guide A
| Standard / Reference | Full title | Organization | Application area | Relevance | Edition status |
|---|---|---|---|---|---|
| ISO 19650 | Organization and digitization of information about buildings and civil engineering works, including building information modelling (BIM) | ISO | Information management across the asset lifecycle | Defines information management roles, exchange requirements and CDE governance for coordinated delivery. | Current adopted edition to be confirmed at project commencement |
| buildingSMART IFC | Industry Foundation Classes (IFC) data schema | buildingSMART International | Open data exchange between authoring and coordination platforms | Supports federated model exchange, quantity take-off and lifecycle handover workflows. | Current adopted edition to be confirmed at project commencement |
| ASHRAE Guideline 36 | High-Performance Sequences of Operation for HVAC Systems | ASHRAE | Mechanical control sequences and operational performance | Informs modelled system behaviour, commissioning logic and performance verification criteria. | Current adopted edition to be confirmed at project commencement |
| CIBSE Guide A | Environmental Design | CIBSE | Internal environment and HVAC design criteria | Supports accurate environmental design assumptions and comfort criteria documentation. | Current adopted edition to be confirmed at project commencement |
Applicable standards depend on the project jurisdiction, information requirements, contract documents, delivery method and authority requirements. The adopted editions shall be confirmed at project commencement.
Discipline Revit models at agreed LOD with federation exports.
Version-controlled sizing calculations with input assumptions.
Sheet views derived from approved models with revision tracking.
Tagged equipment lists linked to model elements and specifications.
System descriptions for complex or performance-critical installations.
Meeting minutes, clash status and interface resolution logs.
Scheduled checks for naming, connectivity, clearance and data completeness.
Independent review of critical plant and distribution sizing.
Cross-discipline sign-off before milestone release.
Verify issued drawings match approved model revision.
All revisions recorded with author, date and impact note.
Formal submission and response tracking at agreed intervals.
Percentage of model elements passing defined audit rules per milestone.
Proportion of active systems with calculations matching current model revision.
Number of coordination cycles completed within agreed programme windows.
Share of revisions attributable to coordination failures versus client-driven change.
Count of discrepancies between issued drawings and approved model per audit.
Accuracy depends on timely receipt of architectural, structural and client criteria.
Geometry beyond agreed LOD may require additional commission for fabrication detail.
Equipment dimensions may be provisional until contractor procurement confirms selections.
Existing building surveys and site constraints may reveal conditions not visible in design models.
Accurate design addresses engineering correctness — sizing, routing logic, code compliance and documentation integrity. Clash reduction is one output of accurate, coordinated models but does not alone guarantee engineering validity.
LOD targets depend on procurement strategy and contract requirements. Typical MEP construction issue ranges from LOD 300 to 350 for distribution and LOD 350 to 400 for plant rooms. Targets are confirmed in the BIM execution plan at project commencement.
Model-first coordination with defined milestone gates reduces late redesign and parallel rework streams. Programme benefit depends on client decision speed, interface party responsiveness and change control discipline.
We apply discipline-specific audit checklists, calculation cross-checks and federation reviews. Milestone release requires documented sign-off against agreed information requirements.
We can define scope, coordination milestones, information requirements and performance metrics for your project — and prepare a formal proposal.