Last updated 23 September 2026 · By Acasa Construction

How to use the house construction budget calculator

The calculator adds every cost of building a home, not only the construction. It takes about five minutes if you have your numbers ready.

1. Enter your land details. Type the plot area and the rate per sq.ft, then your registration cost. If you already own the land, leave these empty.
2. Add approval, EB and borewell costs. These are the costs you pay before and during construction. Tap the i beside each one if you are not sure what it covers.
3. Enter the built-up area and construction rate. This gives the house construction cost. Not sure of the rate? Our residential construction cost per sq ft guide explains what each rate gets you.
4. Add interiors, compound and tanks. Fill only the items you need. Anything left empty is shown as “Not added” and counts as zero.
5. Set the miscellaneous buffer. Move the slider to at least 5%. The total, the breakup and your all-in cost per sq.ft update instantly.
6. Save or share your budget. Tap Copy breakup to paste the itemised list into WhatsApp or your notes, or call us for a detailed quotation.

Want to see how each stage of the build connects to these costs? Read the residential building construction process.

What you need before you start

You need a few numbers to get an accurate budget. Here is what each one means, where to get it, and the figures from a real house plan so you can compare.

Land area and land cost

• Land area in sq.ft (length × width of the plot)
• Land cost per sq.ft

Example: The plot is 60 ft long and 40 ft wide, so the land area is 60 × 40 = 2,400 sq.ft. The land cost is ₹2,000 per sq.ft, which makes the land ₹48,00,000.

Land registration cost

When you buy land, you pay stamp duty and a registration fee at the sub-registrar office. In Tamil Nadu these are worked out on the guideline value of the land or your sale value, whichever is higher. You also pay a document writer, and for the encumbrance certificate (EC) and patta transfer. Rates change from time to time, so check the current figures on the TNREGINET portal or ask your document writer, then enter the total in the calculator.

At the time of writing, a sale deed in Tamil Nadu is commonly charged 7% stamp duty plus a 4% registration fee, so about 11% of the value before the small document writer and EC charges.

Example: For land valued at ₹48,00,000, stamp duty at 7% is ₹3,36,000 and the registration fee at 4% is ₹1,92,000. Total registration cost: ₹5,28,000.

Approval cost

• Cost of the approval drawings
• Fees paid to the local body, and any agent charges

Example: The approval drawings cost ₹15,000. The approval itself, including agent charges, took ₹1,10,000. So approval came to ₹15,000 + ₹1,10,000 = ₹1,25,000.

EB connection cost

• Temporary connection cost during construction
• Tariff change to domestic after the house is complete
• A new pole, if there is no EB line near your land

Example: The EB connection, including agent charges, was ₹7,000. The tariff change after completion was ₹5,000. Total EB cost: ₹12,000.

Borewell cost

• Depth required for a bore in your area
• Drilling cost per foot, including materials

Example: Bores in this area need about 200 ft, but the owner asked for 220 ft to be safe. At ₹80 per ft, drilling cost ₹17,600.

House construction cost

• Built-up area in sq.ft
• Construction cost per sq.ft for your specification

Example: A 3BHK needed 2,000 sq.ft of built-up area. At ₹2,200 per sq.ft, construction came to ₹44,00,000.

If you only want the construction cost, use the house construction calculator. For typical sizes, see the 2000 sq ft house construction cost and 3BHK house construction cost guides.

Interior cost

• TV and pooja unit
• Modular kitchen
• Wardrobes in all rooms
• False ceiling where required

Example: The interior budget was ₹7,00,000. It covered wardrobes in every room, a TV unit, a modular kitchen and a false ceiling in the hall.

Compound wall and gate

First decide whether you will build the wall with bricks, beams and columns, or use readymade (precast) walls. Many owners use both: a built wall at the front for looks and readymade panels on the other sides to save money.

For a built wall you need the length in running feet and the rate per running foot. For a readymade wall you need the length, the height and the rate per sq.ft. Add the gate cost separately.

Example: The walls are 5 ft high all round. The 40 ft front wall was built at ₹2,000 per running ft, which comes to ₹80,000. The other three sides (40 + 60 + 60 = 160 ft) used readymade walls at ₹75 per sq.ft: 160 × 5 × 75 = ₹60,000.

Overhead tank, septic tank and sump

For each tank you need the capacity in litres and the construction cost per litre.

Example: The engineer suggested a 2,000 litre plastic tank, but the owner chose a 3,500 litre concrete overhead tank at ₹25 per litre (₹87,500). The septic tank is 7,000 litres at ₹20 per litre (₹1,40,000). The sump under the parking is 4,000 litres at ₹25 per litre (₹1,00,000).

Miscellaneous buffer

Keep at least 5% of the budget aside. In the example house, the 5% buffer paid for:

• Bore motor and bore materials
• Electrical fittings
• A few commissions
• Upgrading to bigger tiles and a different western closet
• A new AC and TV for the housewarming
• A watchman and the EB bills during construction

Worked example: a full house budget

Here are all the numbers above together: a 2,000 sq.ft 3BHK on a 2,400 sq.ft plot. Tap “Load the worked example” in the calculator to see it with the full breakup.

Land and construction together make up about 79% of this budget. Construction alone is about 38%, and registration by itself costs more than the approval, EB, borewell and all three tanks put together. That is why a construction rate per sq.ft on its own is not a budget.

What this calculator does not include

The result is only as accurate as the rates you enter, and some costs sit outside it:

• Loan interest and processing fees. If you are taking a home loan, work out the monthly payment with our home loan EMI calculator.
• Price changes. Cement, steel and labour rates can rise during a build that takes a year or more.
• Site problems. Weak soil, a low-lying plot that needs filling, or a deeper foundation can raise the cost.
• Rent while you build, plus moving costs, furniture and appliances beyond what your buffer covers.

Use the result to plan your finances, then get an itemised quotation before you commit to a loan amount.

Frequently asked questions

Related guides and calculators

• House construction calculatorConstruction-only cost with Standard, Premium and Luxury rates.
• Residential construction cost per sq ftWhat each construction rate includes.
• 1200 sq ft house construction cost in Tamil NaduA cost guide for a common house size.
• 2000 sq ft house construction costDetailed cost for a larger family home.
• 3BHK house construction costA realistic guide to building a 3BHK.
• Home loan EMI calculatorTurn your budget into a monthly payment.
• Construction cost in TrichyLocal rates for building in Trichy.
• Residential building construction processEvery stage from foundation to handover.