Published: August 2026 | White Warp | whitewarp.in
Profit on a plot redevelopment in India is total sale revenue from the completed units minus every cost incurred to produce them: land cost, construction cost, GST on construction where applicable, approval and professional fees, financing cost if the project is loan-funded, and selling costs. Net profit divided by total cost gives return on investment. The number most buyers get wrong is the cost side, because construction cost, GST treatment, and approval costs are routinely underestimated or left out entirely.
Quick Answer
- Profit = total sale revenue minus (land cost + construction cost + GST + approval costs + financing cost + selling costs).
- Land cost is the price paid to acquire the plot, plus stamp duty and registration, which typically add several percent on top of the base price depending on the state.
- Construction cost should be built up from a per-sqft rate applied to built-up area, not assumed from a single round-number figure, since specification level moves this rate significantly.
- GST applies to under-construction sale of flats at a rate set by current GST law, and its exact applicability and rate depend on the project type and whether input tax credit is available; confirm the current position with a tax professional rather than assuming a fixed percentage.
- Approval costs (building plan sanction, RERA registration where applicable, professional fees for architect and structural engineer) are a real cost line, commonly a single-digit percentage of construction cost, and are frequently left out of quick feasibility math entirely.
- Return on investment (ROI) = net profit / total cost. This is different from IRR, which also accounts for the time the capital is tied up.
Step 1: Establish Total Land Cost
Land cost is not just the negotiated price per the sale agreement. Add stamp duty and registration charges, which vary by state and can add a meaningful percentage on top of the base price. Add any brokerage paid on the purchase side. This full figure, not the headline price alone, is the land cost that belongs in the profit calculation.
Step 2: Build Up Construction Cost from a Per-Sqft Rate
Estimate total built-up area based on the applicable FSI/FAR for the plot (confirmed against the current governing regulation, not assumed), then apply a per-sqft construction rate appropriate to the intended specification level and current material and labour costs in the specific market. A single blended per-sqft figure without accounting for the finish level is a common source of underestimation, since mid-spec and premium-spec construction can differ by a wide margin per sqft.
Step 3: Add GST Where Applicable
GST applies to the sale of under-construction residential units at rates set under current GST law, and treatment differs depending on project type and affordability classification. This is a real cost that flows through to either the developer's margin or the buyer's price, depending on how it is structured, and it should not be omitted from the cost side of a redevelopment calculation. Confirm the current applicable rate and structure with a tax professional or chartered accountant for the specific project, since GST law and rates are subject to change and depend on project-specific facts.
Step 4: Add Approval and Professional Costs
Building plan sanction fees, RERA registration where the project falls under RERA thresholds, architect and structural engineer fees, and any completion or occupancy certificate costs all add up. These are commonly in the single-digit percentage range of construction cost, but they are a real and recurring line item, not a rounding error, and quick feasibility math frequently drops them entirely.
Step 5: Add Financing Cost if the Project Is Loan-Funded
If construction is funded partly or wholly through a loan, interest accrued during the construction period is a real cost, even though it is not a cash outflow to a third party for materials or labour. This cost grows with construction delays, which is one reason a delayed project erodes margin faster than the delay itself might suggest.
Step 6: Add Selling Costs
Broker commission on the sale side (commonly a percentage of sale value), any marketing spend, and legal costs on transferring title to buyers are real deductions from gross sale revenue before arriving at net profit.
Step 7: Compute Net Profit and ROI
Net profit = total sale revenue - (land cost + construction cost + GST + approval costs + financing cost + selling costs). ROI = net profit / total cost, expressed as a percentage.
Worked Example: 300 sqm Plot, Redevelopment Into 4 Independent Floors
Land cost: ₹1.8 crore purchase price + 6% stamp duty and registration (state-specific, confirm exact rate) = ₹1.908 crore
Buildable area: Assume FAR/FSI applicable to this plot size and location yields approximately 480 sqm (5,170 sqft) of built-up area across 4 floors (confirm exact FSI for the specific plot and authority before relying on this figure).
Construction cost: At a mid-spec rate of ₹2,000/sqft on built-up area (confirm current market rate for the specific location and spec level): 5,170 sqft x ₹2,000 = ₹1.034 crore
GST: Estimated at a placeholder rate for illustration only — confirm the actual applicable rate and structure with a tax professional before using in a real calculation. This example excludes a specific GST figure deliberately, since stating one without professional confirmation would misstate the actual liability.
Approval and professional costs: Assume 6% of construction cost = ₹6.2 lakh
Financing cost: Assume ₹40 lakh borrowed at prevailing rates for an 18-month construction period; interest cost approximately ₹7.2 lakh (illustrative, confirm against actual loan terms).
Selling costs: Assume 2% brokerage on sale revenue.
Sale revenue: At a market-comparable rate of ₹6,800/sqft on net sellable area of approximately 4,400 sqft (after deducting roughly 15% for walls and circulation from the 5,170 sqft built-up figure): 4,400 x ₹6,800 = ₹2.99 crore
Selling cost: 2% of ₹2.99 crore = ₹5.98 lakh
Total cost (excluding GST, which requires professional confirmation): ₹1.908 crore (land) + ₹1.034 crore (construction) + ₹6.2 lakh (approvals) + ₹7.2 lakh (financing) + ₹5.98 lakh (selling) ≈ ₹3.02 crore
Net profit (before GST adjustment): ₹2.99 crore - ₹3.02 crore ≈ marginally negative on this specific set of assumptions, before GST is even factored in.
This worked example intentionally lands close to breakeven to illustrate the point that redevelopment margins are frequently thinner than a quick back-of-envelope estimate suggests once every cost line is included, and that GST, left out here for accuracy reasons, would move this further. Do not read the specific rupee figures above as representative of any real plot; they exist to show the method.
Common Mistakes
Leaving GST out of the calculation entirely. It is a real cost or a real price adjustment, not an afterthought, and its absence from a quick estimate materially overstates apparent profit.
Using a single blended construction rate regardless of specification. Mid-spec and premium-spec construction costs differ meaningfully per sqft, and using an average figure for a premium project understates cost.
Forgetting approval and professional fees. These are commonly dismissed as minor, but across a full project they are not trivial.
Ignoring financing cost on borrowed capital. Interest during construction is a real cost that grows with delay, and delay is common, not exceptional.
Comparing gross sale revenue to land plus construction cost only. Skipping approvals, financing, and selling costs from the cost side inflates the apparent margin.
FAQ
Does GST apply to every redevelopment project in India? GST applicability and rate depend on the project type, whether it qualifies under affordable housing criteria, and the structure of the transaction. This varies enough that it needs confirmation from a tax professional for the specific project rather than a general assumption.
Is stamp duty the same across all states? No, stamp duty and registration rates vary by state and sometimes by local body, and some states offer concessions for specific buyer categories. Confirm the current rate for the specific state and transaction.
What is a reasonable profit margin to target on a redevelopment? There is no single universal benchmark, since it depends on land cost, location, financing structure, and risk appetite. A feasibility model that accounts for all cost lines, run against realistic market-comparable selling prices, is a more reliable guide than a rule-of-thumb percentage.
Should IRR be used instead of ROI for redevelopment projects? IRR accounts for the time value of money and the timing of cash flows, which ROI does not. For a project spanning 18 months or more with capital tied up throughout, IRR is a more complete measure than a simple ROI percentage.
What happens if construction costs overrun the estimate? A cost overrun directly reduces net profit, since sale revenue is generally fixed by the market at the time of sale rather than adjustable to cover higher costs. This is one reason a fixed-price construction contract, where achievable, reduces this specific risk.
White Warp builds the full cost stack, including construction, approvals, and financing, into every redevelopment feasibility report, run against market-comparable revenue. Run your redevelopment numbers →