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Service Overview
Desapex provides 5D BIM services that connect model-based quantity take-off with project cost information. We help owners, developers, quantity surveyors, contractors and commercial teams build a more transparent basis for estimating, budgeting, procurement and design-change evaluation.
Our BIM-based cost estimation approach combines validated model quantities, agreed measurement rules, cost classifications and project-specific rates. The result is structured cost information that can be reviewed, updated and compared as a project develops.
Whether you are planning a commercial building, industrial facility, data center or refurbishment, our 5D BIM cost management services help your team understand what has been measured, how it has been priced and which assumptions still require confirmation.
What is 5D BIM cost management, and how does it connect BIM quantities with construction costs?
5D BIM cost management is the process of linking measurable building information model elements to quantity rules, cost codes and pricing data. Quantities are extracted from the model, validated against the project scope and multiplied by approved rates to develop cost estimates. Non-modelled work, allowances and risks must also be assessed separately.
For example, a coordinated BIM model may contain concrete slabs, structural steel, ductwork, pipework and electrical equipment. Each relevant element or assembly can be associated with a measurable quantity and a corresponding cost item.
The basic calculation is:
Measured quantity × applicable unit rate = estimated direct cost for that item
A complete construction estimate also needs to account for labour, plant, installation, waste, temporary works, indirect costs, contingency and other project-specific requirements where they are not already included in the selected rates.
This is what distinguishes 5D BIM from a simple list of quantities: the model becomes a structured source of measurement information within a controlled cost-planning process.
Our Digital-First Approach
Assess Model Readiness
Before measuring, we review the available BIM models, drawings and specifications to understand model scope, development status, classification quality and missing information. We identify elements that can be measured reliably and those requiring additional checks or non-model allowances.
Extract and Validate Quantities
We use model-based quantity take-off workflows to measure agreed architectural, structural, civil and MEP elements. Quantities are checked against relevant drawings, measurement rules and design information to identify omissions, duplicates, inconsistent parameters and potential measurement discrepancies.
Connect Quantities to Cost Data
We map validated quantities to agreed BOQ items, work packages, cost codes and pricing structures. Client-provided rates, tender data or agreed estimating assumptions are applied with clear units and inclusion rules, allowing the commercial team to review how each estimate has been built.
Develop Cost Plans and Scenarios
We organize quantities and rates into structured cost estimates that support design option comparisons, package-level budgeting and procurement planning. Where sufficient information exists, we can compare alternative materials, system configurations and construction approaches using a consistent cost basis.
Control Revisions and Cost Changes
When an approved model revision is issued, we identify relevant quantity changes and assess their estimated cost impact. Version-controlled reports, documented assumptions and commercial validation help distinguish design changes from pricing changes, scope additions and other movements in the budget.
Core Deliverables
BIM-Based Quantity Take-Off Reports: Structured quantity schedules for the agreed building systems, disciplines and project packages. Depending on the available model information and scope, measurement may include concrete volumes, formwork areas, structural steel quantities, wall and floor areas, ductwork, pipework, cable containment, equipment counts and other defined components. Reports identify measurement units, model revisions, exclusions and items requiring further verification.
Bills of Quantities (BOQ) and Measurement Schedules: Organized quantity and BOQ documentation aligned with the project's procurement packages, classification system and selected method of measurement. Depending on the contract requirements, outputs can support tender preparation, contractor pricing and quantity reconciliation. They do not automatically replace contractual measurement or certification procedures.
5D BIM Cost Models and Cost Estimates: Linked quantity-and-cost datasets showing how measurable BIM elements relate to estimate items, cost codes and unit rates. Outputs can include item-level cost build-ups, discipline-level summaries and package-level estimated totals, together with a documented basis of estimate.
Cost Planning and Budget Breakdown Reports: Cost information organized by building, zone, discipline, system or construction package to support budget reviews and design development. Reports can distinguish model-derived quantities from separately estimated allowances, provisional sums and non-modelled scope.
Design Change and Quantity Variance Analysis: Comparison of agreed model revisions to identify additions, removals and modified quantities. Where pricing data is available, reports show the estimated value of those changes and provide supporting information for commercial review and change management.
Procurement and Tender Quantity Support: Measurable quantities organized around procurement needs, helping teams review package scope, compare tender quantities and identify potential gaps between design information and commercial documentation. Manufacturer-dependent equipment, vendor-specific assemblies and items outside the model are assessed using the relevant specifications and available supplier information.
Cost Reporting and Forecasting Support: Structured estimate revisions, variance registers and cost datasets for use in project reporting. Where approved progress, commitments, actual expenditure and schedule data are supplied and reconciled, the cost model can contribute to budget-versus-actual reporting and forecast-at-completion assessments. These outputs depend on the available financial systems, reporting frequency and agreed integration scope.
Why Choose Desapex
A useful cost estimate begins with understanding what the model represents. Desapex combines BIM modelling, engineering coordination and digital information management capabilities to support quantities that reflect project scope and technical intent.
Our workflows consider how architectural, structural and MEP systems are modelled, how design interfaces affect measurement and where assumptions must be reviewed.
Quantity Information That Can Be Traced and Checked
We emphasize model validation, identifiable source revisions, measurement conventions and consistent quantity-to-cost mapping.
Rather than treating an exported schedule as a final commercial answer, we help teams understand which quantities come from the model, which have been adjusted and which require separate estimation.
Desapex's wider digital engineering capabilities span data centers, manufacturing facilities, process plants, commercial buildings and infrastructure.
For data centers in particular, cost planning may involve complex mechanical and electrical systems, specialist equipment, repeated modules, redundancy strategies and phased construction packages. Our model-based approach supports quantity and cost assessment at the level of detail available in the project's design and specification.
Our approach can be aligned with the agreed cost breakdown structure, BOQ format, classification conventions and reporting requirements. The aim is to provide information that quantity surveyors, commercial managers, estimators and procurement teams can use within their established approval processes.
Unique Selling Proposition
Desapex connects digital engineering information with practical construction cost workflows.
Our focus is on preserving the relationship between model quantities, measurement assumptions, estimate items and source revisions so that commercial teams can identify the basis of a cost figure and assess what has changed.
Instead of relying on unverified automated quantities or presenting a model as a complete financial system, we establish structured, reviewable information that supports informed estimating and cost management.
From the first cost plan to design revisions and procurement reviews, we help make the connection between design decisions and estimated construction costs clearer.
Frequently Asked Questions
What is the difference between BIM quantity take-off and 5D BIM cost management?
BIM quantity take-off measures elements and materials using information from a building model. It produces quantities such as cubic metres of concrete, square metres of finishes, metres of pipework or counts of equipment. 5D BIM cost management adds the commercial dimension by mapping quantities to cost items and applying appropriate rates and allowances. It supports cost planning, estimate revisions and financial assessment of design options. A quantity report alone is not a complete construction cost estimate.
How accurate are quantities and estimates generated using 5D BIM?
Can 5D BIM be used when the model is incomplete or still developing?
What information does Desapex need to start a 5D BIM project?
How does 5D BIM help manage design changes and construction cost forecasting?
Which projects benefit most from 5D BIM cost management?
