Inputs
Example data table
| Area (m²) | Base rate | MEP rate | FF&E rate | Lump sums | Factors | Cont. / Fees / Tax | Expected grand total (approx.) |
|---|---|---|---|---|---|---|---|
| 120 | 5,500 | 2,200 | 1,800 | 600,000 | 1.00 × 1.10 | 10% / 6% / 15% | ~ 1.9M – 2.5M |
| 250 | 6,800 | 2,900 | 2,300 | 1,050,000 | 1.05 × 1.15 | 12% / 7% / 15% | ~ 5.5M – 7.0M |
| 60 | 4,800 | 1,900 | 1,200 | 250,000 | 0.95 × 1.05 | 8% / 5% / 15% | ~ 0.8M – 1.1M |
Formula used
- Direct rate (per m²) = Base rate + MEP rate + FF&E rate
- Direct cost = Area × Direct rate
- Wastage = Direct cost × (Wastage % / 100)
- Subtotal before factors = Direct cost + Wastage + Lump sums
- Factored subtotal = Subtotal × Location factor × Complexity factor
- Preliminaries = Factored subtotal × (Prelims % / 100)
- Construction subtotal = Factored subtotal + Preliminaries
- Contingency = Construction subtotal × (Contingency % / 100)
- Escalation = (Construction subtotal + Contingency) × (Escalation % / 100)
- Fees = (Construction subtotal + Contingency + Escalation) × (Fees % / 100)
- Tax = (Construction subtotal + Contingency + Escalation + Fees) × (Tax % / 100)
- Grand total = Construction subtotal + Contingency + Escalation + Fees + Tax
How to use this calculator
- Enter the fit-out area in square meters.
- Choose a currency for display and exports.
- Set unit rates for finishes, services, and furniture.
- Add lump sums for partitions, joinery, and IT/security.
- Adjust factors for location and project complexity.
- Set preliminaries, contingency, escalation, fees, and tax.
- Press Calculate to see results above the form.
- Use Download CSV for spreadsheets and records.
- Use Download PDF to print or save a report.
Scope drivers that shape fit-out budgets
Fit-out cost is primarily driven by scope definition and finish level. Higher ceiling features, premium flooring, acoustic walls, and custom lighting increase the base rate quickly. Service intensity matters too: dense power points, extra HVAC zones, and specialist plumbing raise the MEP allowance. Early zoning plans and a clear room schedule help convert “nice to have” items into measurable quantities and realistic rates.
Rate-based estimating for fast option testing
This calculator combines unit rates per square meter with selected lump sums to produce a practical budget baseline. A blended direct rate captures core finishes, building services, and FF&E allowances. Using rates supports quick scenario checks, such as comparing open-plan layouts versus cellular offices, or standard versus premium finishes. Keep rates consistent with your procurement route and specification level for reliable benchmarking.
Allowances, lump sums, and risk buffers
Lump sums are useful where detail is limited, such as partitions, joinery, and IT/security packages. As design develops, replace lump sums with line items from a BOQ or vendor quotes. Contingency should reflect uncertainty: early concept stages often need higher allowances than coordinated construction drawings. Wastage also protects budgets from cutting loss, small orders, and minor rework during installation.
Factors for location, constraints, and market movement
Location and complexity factors adjust the subtotal for regional pricing and project constraints. Tight access, restricted working hours, and occupied-site sequencing typically increase labor and supervision. Escalation covers forecasted material and labor inflation between estimate date and award. Apply escalation only when timelines justify it, and review it against supplier indices and recent tender returns.
Reading the breakdown and improving accuracy
Use the breakdown to identify the biggest cost levers: direct cost, preliminaries, and risk allowances. If the unit cost per square meter looks high, check rates and factors before reducing contingency. Improve accuracy by validating area take-offs, confirming inclusions and exclusions, and aligning fees and tax rules with your contract structure. Regularly update rates using recent purchase orders and quotations.
FAQs
1) What area should I enter for a fit-out estimate?
Use the net fit-out scope area that will receive finishes and services. Exclude landlord areas that are not being altered. If only gross area is available, apply a realistic efficiency factor.
2) How do I choose base, MEP, and FF&E rates?
Start with recent project rates for a similar finish level and building type. Separate finishes from services and furniture to test options. Update rates as specifications, layouts, and quantities become clearer.
3) What do location and complexity factors represent?
They adjust costs for regional market pricing and site constraints. Location reflects labor and material differences. Complexity reflects access limits, night work, occupied conditions, and coordination intensity that increase time and supervision.
4) When should I apply contingency and escalation?
Use contingency to cover scope uncertainty and design development risk. Use escalation when the estimate will be awarded later and prices may rise. Reduce both as design freezes and quotations replace allowances.
5) Are professional fees and tax always applied to the whole amount?
Not always. Fees may exclude furniture or client-supplied items, and tax rules vary by jurisdiction and contract. Confirm your fee basis and applicable tax treatment, then adjust the percentages to match.
6) How can I make this estimate closer to a tender value?
Replace lump sums with itemized BOQ quantities, confirm equipment schedules, and obtain supplier quotes for major packages. Align preliminaries with your program and logistics plan, and validate against comparable tender returns.