BIM Benefit Estimate (discounted cash flow)

Each saving is applied to its correct base, net of overlap, and discounted to present value.

This is a SCENARIO tool for discussion, not a financial appraisal. Results depend entirely on the assumptions you enter — move the sliders to see which assumptions the outcome is sensitive to. The model does NOT account for: inflation, tax, cost of capital beyond the discount rate, project risk, or hard-to-quantify benefits (safety, quality, disputes). Do not use it as the sole basis for an investment decision.

Project parameters

Total investment100 tỷ

Construction cost / total investment70 %

The rest is land, consultancy, equipment, contingency, tax

Construction duration2 năm

BIM implementation cost1.5 % TMĐT

Construction cost: 70.00 bn · BIM cost: 1.50 bn

Construction-phase assumptions

Clash detection savings0.5 % CP xây dựng

Rework reduction4 % CP xây dựng

Overlap between clash & rework30 %

Clash-driven rework is already counted under clash — this removes the double count

Schedule reduction3 % thời gian

Time-dependent cost share10 % CP xây dựng

Site overheads, management, equipment hire. Materials do NOT get cheaper when you build faster.

Operation & finance assumptions

Annual O&M cost2 % TMĐT

O&M reduction from AIM15 % CP O&M

AIM upkeep cost10 % CP O&M

Data updates, software renewal, training. Ignoring it treats O&M savings as free money.

O&M years modelled10 năm

Discount rate10 %/năm

Money saved in year 20 is not worth the same as money saved today

Results (present value)

PV of benefits

3.62 bn

PV of costs

2.32 bn

Net present value

1.30 bn

ROI (on PV basis)

56%

Discounted payback: 1.0 years

Nominal totals (undiscounted): benefits 5.41 bn, costs 3.50 bn

Cumulative discounted cash flow (bn VNĐ)

Crossing the zero line is the payback point

Components (nominal, bn VNĐ)

Benchmark figures — source-labelled

The sources below use DIFFERENT BASES — some quote % of project value, others % of construction cost, and schedule figures are % of time. These numbers are not directly comparable. The sliders above each state their own base; convert accordingly when taking a figure from a source.

[Software Vendor][Government / Official body][Academic Research][BIM Program Target]

Clash detection savings

Reduction in design conflict detection & resolution costs during construction

A0.5% of project value— Eastman et al. 2011; buildingSMART (Average for complex international projects)

V1–2% of project value— Autodesk ROI Report 2022 (Higher range from vendor report)

O0.3% of project value— UK BIM Task Group 2012 (UK public projects using BIM Level 2)

Rework reduction

Reduction in design error corrections during construction vs traditional CAD

A3–5% of construction cost— McGraw-Hill SmartMarket 2014 (Survey of 800+ North American projects)

V15–40% RFI reduction— Autodesk / Dodge Data 2021 (Process metric — does NOT convert directly to a cost %)

Schedule reduction (4D)

Construction duration reduction through 4D scheduling and early coordination. Note: this is a % of TIME — it only saves the time-dependent share of cost.

O2–5% of construction time— Singapore BCA BIM Roadmap 2022 (Singapore pilot project results)

P10% schedule reduction target— Chương trình BIM Việt Nam 2022–2030 (Program target, not yet validated)

O&M savings (AIM)

Operational cost reduction through accurate AIM data and integrated CMMS

V10–25% of O&M costs— Autodesk Lifecycle Report 2021 (Best-case AIM–CMMS integration scenario)

P20% maintenance cost reduction target— Chương trình BIM Việt Nam (Long-term target, needs VN field data)