Construction cost calculator — base rate, fees, approvals and escalation
Turn a built-up area and the rate you have been quoted into a full development construction budget, with professional fees, statutory charges, external works, escalation and contingency shown as separate, editable lines.
Scheme
Enter the rate you have been quoted. DevPartner does not publish rates — they change by city, specification and month.
Additions
Architect, structural, MEP, PMC, survey and site supervision, as a percentage of base construction.
Scrutiny, development, betterment, infrastructure and connection charges as confirmed for your authority. DevPartner publishes no statutory rate.
Roads, boundary, drainage, STP, substation, landscape and amenity works not carried in the base rate.
Risk
Your own view of input cost movement over the programme, applied to the subtotal.
Design development and site risk allowance, applied after escalation.
Result — calculated from your inputs
Check these inputs
- Enter the base construction rate you have been quoted. DevPartner does not pre-fill a rate: it moves by city, specification, structural system and month, and a published figure would read as a quotation.
Cost build-up
Per square foot of built-up area
Continue to a full site assessment
A calculator answers one question. A DevPartner assessment carries planning capacity, programme, cost, revenue, deal structure and cash flow through one deterministic model and freezes a versioned decision report.
Nothing from this calculator maps into the assessment intake, so you will start from a blank site. No opportunity is created until you save one.
How this calculator works
base = built-up area (sq ft) × base rate fees = base × professional fees % approvals = base × approvals % external works = base × external works % subtotal = base + fees + approvals + external works escalation = subtotal × escalation % contingency = (subtotal + escalation) × contingency % total = subtotal + escalation + contingency all-in rate = total ÷ built-up area (sq ft)
- You enter
- A value you supply. Nothing is assumed for you.
- Calculated
- Arithmetic on your inputs, shown in the working.
- Assumption
- A factor or allowance you can change — mix ratios, wastage, dry-volume factors.
- Approximation
- Geometry or method that approximates reality; labelled wherever used.
- Verify locally
- Planning parameters, statutory rates and structural design must come from the authority or a qualified professional.
The quoted rate is never the cost
A contractor's rate per square foot covers the structure and the finishes inside the plot line. It rarely covers design and PMC fees, scrutiny and development charges, the substation and STP, the approach road, landscape, or the cost of building the same scheme eighteen months later than the rate was quoted. Every one of those is real cash, and every one of them lands on the same built-up area.
This calculator keeps them as separate lines against a single base so the loading is visible. If your all-in rate comes out twenty to thirty percent above the quoted rate, that is not an error in the calculator — that is the part of the budget that usually gets discovered late.
How to set escalation honestly
Escalation is a function of programme length, not optimism. A twelve-month build carries a different exposure to cement, steel and labour movement than a thirty-six-month phased scheme. Take your own view, apply it to the subtotal, and record the reasoning next to the number rather than burying it in a rounded-up rate.
Where the contract is fixed-price with a price variation clause, model the clause rather than a flat percentage: the risk sits with whichever party the clause allocates it to, and that allocation is worth more than a percentage guess.
What contingency is for
Contingency covers design development, site conditions found after excavation, and the scope the drawings do not yet show. It is not a slush fund for a rate that was known to be low, and it is not a substitute for a quantity survey. Applying it after escalation, as this calculator does, means the allowance scales with the escalated budget rather than the original one.
Treat the resulting total as a planning budget. A tendered bill of quantities from a quantity surveyor, priced against drawings, is the only figure that should govern a commitment.
Worked example
10,000 sq ft at ₹2,000 per sq ft gives a base of ₹2 crore. Professional fees at 4%, approvals at 2% and external works at 3% add ₹18 lakh. Contingency and escalation are then applied on top, and the all-in per square foot rises well above the ₹2,000 rate the discussion started with.
That gap between the quoted rate and the all-in rate is what turns an apparently viable scheme into a marginal one.
Mistakes in construction budgeting
Budgeting the contractor's rate and forgetting everything around it: design fees, approvals, infrastructure, connections, site development and contingency.
Applying escalation to a contracted, fixed-price package where it does not apply, or omitting it on a three-year build where it certainly does.
Costing built-up area and then pricing revenue on saleable area without reconciling the two, which quietly inflates margin.
Limits of this calculator
DevPartner publishes no construction rate. Rates depend on city, specification, structural system, height, labour market and procurement route, and a published figure would be read as a quotation. Enter a rate you have obtained from a contractor, a quantity surveyor or a recent comparable.
Cash flow, funding cost and phasing are outside this page. They are part of a full assessment, because interest on a slipped programme frequently exceeds the construction saving being argued over.
Frequently asked questions
- What construction rate should I use per square foot?
- The rate you have actually been quoted for your specification and city. DevPartner does not publish rates because they vary by structural system, finish level, height, labour market and month, and a published number would be read as a quotation rather than an assumption you own.
- Is the rate applied to built-up area or saleable area?
- Built-up area — the area you physically construct, including common areas, service areas and typically the parking structure if it is not costed separately. Applying a construction rate to saleable area understates the budget wherever saleable area is smaller than built-up area.
- What should professional fees cover?
- Architecture, structural and MEP design, project management, survey, soil investigation, quantity surveying and site supervision. Enter the percentage your own appointments add up to; the calculator does not assume one.
- Does this total include land, marketing and finance cost?
- No. This is the construction budget only. Land and acquisition cost, marketing, sales commission, finance interest and overheads sit outside it. The full DevPartner assessment carries all of them through a cash flow.
- Why is contingency applied after escalation?
- Because contingency is an allowance against a budget you intend to spend, and that budget already includes escalation. Applying it to the pre-escalation subtotal understates the allowance on a long programme.