This guide is written from a real homeowner's experience of building a house in India. Most of these things you only find out AFTER the contract is signed and construction has started — by then it costs you extra money to fix. Read this before you sign your construction contract.
Why this guide exists
Ask ChatGPT or any AI about building a house and you'll get textbook answers. A contractor's tricks come from years of running sites — they hide in what's left out of the contract, and a generic tool can't judge the fraud that's being planned for you. This guide is written from a real build, item by item.
Most contractors don't break the contract — they follow it exactly. The money is made in everything the contract doesn't specify: size, grade, model, finish. Whatever isn't written arrives as the cheapest version, and the better one becomes an 'extra'.
By the middle of the job, most owners have already paid most of the money. Then the pressure starts: pay for this extra, or work stops. The fear — 'if he walks away, my house stays half-built' — makes most owners give in and pay. Plan for this moment before you sign.
This is general guidance based on personal experience, not legal or engineering advice. Always get your contract reviewed and your structural design approved by a licensed engineer/architect.
What they do
Contractors usually dig the foundation (neev) only 2 to 2.5 feet deep. What they don't tell you is that your plot's ground level is often lower than the road level. Once construction starts, the contractor tells you: 'We'll only cover 2-3 feet in our rate — to bring the house up to road level you'll need to raise it by 4 feet, and that means extra costing for every pillar and every beam, plus extra running-sqft rate for the plinth-beam wall, plus separate charges for the soil and stone filling.'
What you should do
Before signing, get the road level and your plot level measured and written into the contract, along with the exact height the plinth will be raised to. Get a fixed, all-inclusive rate for reaching that final height — not a rate that only covers 2-3 feet with everything above that billed as 'extra'.
What they do
While the plinth beam is being cast, nobody thinks about where the water from the chhajja (sunshade) and gallery/balcony will drain. If this isn't planned now, it creates major problems later — you'll be forced to break finished work to add drainage.
What you should do
Insist that chhajja and balcony/gallery drainage pipes and slopes are marked on the plan and installed before the plinth beam and slab work is finished, not after.
What they do
The plinth beam should be designed so the car ramp can be at least 10 feet long. If it isn't planned this way, the ramp has to extend outside the house, which counts as encroachment on the road — the contractor doesn't want the ramp inside the house because that means laying granite stone on a longer ramp (more cost, less profit for him). The result is often a ramp so steep that a car practically cannot climb it. Even when the ramp is in the contract, the granite for it usually isn't defined by length — the contractor will quietly give you a ramp of only about 4 feet. Most houses keep the floor around 2 feet above the road, so that when the road in front is relaid or raised later, road water doesn't enter your base. To climb those 2 feet smoothly, a car needs a ramp of roughly 10 feet — a 4-foot ramp is far too steep.
What you should do
Fix the ramp length (10 feet minimum) and maximum slope in the plan itself, before the plinth beam is cast — and write the granite length and width for the ramp into the contract, not just 'granite on ramp'. Don't let ramp length be decided after the structure is up.
What they do
If you're building an underground water tank, the contractor tends to make it bigger than needed — especially once the house has been raised to road level. Underground tanks and soak pits (sokhta) are usually billed by size/sqft, so a bigger tank or soak pit means more money for the contractor. You won't notice this at the start because it seems like a minor decision.
What you should do
Get the exact tank and soak-pit capacity calculated (based on your family size and daily usage) and written into the contract as a fixed size — not 'as required'.
What they do
If you ask for a lift area to be built, the contractor often skips proper light fittings inside the shaft because it's extra, unbilled work — a lift shaft needs 5-6 heavy-gauge wires, and the electricians who come later usually don't have the specific knowledge for lift-shaft wiring.
What you should do
Get lift-shaft electrical work (heavy wiring + lighting points at each level) explicitly listed as a separate line item with a qualified electrician, not left to the general wiring contractor.
What they do
After the shuttering is removed from the slab (lenter), if there's even a 2-3 inch unevenness, the contractor is supposed to fix it. Instead, many contractors try to hide it with POP (false ceiling) — because normally for a parking area you'd just want a plain ceiling, no false ceiling, and a cheaper rate. Fixing the actual slab is more work for them than covering the mistake.
What you should do
State in the contract that any slab unevenness must be corrected before handover, and that false ceiling is a design choice you make — not a fix for the contractor's construction defects.
What they do
A designer/architect and a mason-labour sub-contractor (mistri ka thekedar) don't think alike. Builders often hand off the actual work to a labour-rate sub-contractor. Your goal is good quality and fast construction, but the mason sub-contractor works at the pace dictated by labour and material availability, and by whatever other sites his team is juggling. When skilled masons are in short supply, and your builder doesn't pay the sub-contractor on time (even though you're paying the builder on time), work slows down — and the sub-contractor won't always tell you why the work has stopped.
What you should do
Ask who the actual execution sub-contractor is, and build in a clause tying your payments to their payments being passed through on time. Get written milestones with dates, not vague timelines.
What they do
Many builders structure payment percentages so that by the time the last slab (lenter) is cast, they've already collected 70-80% of the total contract value — even though the real, expensive costs (painting, stone/granite work, wooden work/carpentry) come after that. The builder's goal then becomes extracting most of the remaining percentage from you too, often by saying things like 'if you pay now, we'll start the stone work tomorrow' to pressure you into paying faster than the work schedule justifies.
What you should do
Tie payment milestones to actual, verifiable stages of finishing work (flooring, painting, woodwork, fittings) — not just structural stages. Keep a meaningful percentage (25-30%) reserved for after finishing work is complete and inspected.
What they do
The contractor may casually suggest doing waterproofing ('jhaap') on the slab, but only later do you find out this is billed at the same per-sqft rate as the slab (lenter) itself — a significant, avoidable extra cost if it's not clearly priced upfront.
What you should do
Get a separate, explicit rate for waterproofing/jhaap work in the contract, and confirm which areas are included.
What they do
Contracts sometimes have a clause (easy to miss in the fine print) that says the boundary wall on each floor is charged at a separate rate — something you often only discover afterward: 'I hadn't even thought about this.'
What you should do
Read every line about boundary walls, parapets, and railings carefully. Ask specifically whether these are included in the base rate or charged separately per floor.
What they do
Contractors usually don't include a false ceiling in the kitchen, which can hurt you later — the exhaust pipe is normally visible and has to run somewhere, which can force you into a full modular kitchen (with cabinets covering the pipe) when your contract only mentioned a semi-modular kitchen. If you do go for a full modular kitchen, the pipe running inside the cabinet eats up usable cabinet space.
What you should do
Plan for a false ceiling to hide the exhaust duct in the kitchen from the start — it's usually cheaper than being forced into extra modular cabinetry later.
What they do
The front elevation design often includes grills in the plan. When it comes time to actually make them, the contractor prefers steel (instead of mild steel/iron) and tells you that this additional cost is on you.
What you should do
Specify the exact material (MS or steel) and finish for all grills, railings, and gates in the contract before elevation work starts, with a fixed rate per kg or per running foot.
What they do
At signing, contracts often lock in low material rates: for example ₹50/sqft for tiles, ₹150/sqft for granite, ₹300/litre for paint. These numbers look reasonable if you check the market rate at signing time. But if you sign in, say, December, and the tiles/granite/paint work happens 9 months later, market rates may have risen sharply — and now the difference comes out of your pocket, because the contract already fixed the low rate for the contractor's costing but didn't account for you benefiting from the market gap.
What you should do
Add an inflation-sharing clause: the contractor bears rate increases up to a point, and shares (e.g. 50-50) any increase beyond the locked rate at the time of actual purchase. If you have storage space, consider buying and storing key finishing materials (tiles, sanitaryware) early yourself to lock in today's price — though note the contractor may resist this, since they'd rather use your advance payment themselves than have you hold the material.
What they do
Contractors often tell you plainly that the front gate and the staircase railing are not part of the contract and you'll have to get them done yourself — or they recommend 'their own' fabricator who charges by weight (per kg) for steel. This is where costs jump: good 304-grade stainless steel costs around ₹500 per kg, and a gate plus staircase railing can easily run into several lakhs. Once you commit to steel for the gate, you're effectively pushed to match it with steel railings elsewhere in the house too, to keep a consistent look.
What you should do
Ask upfront whether the front gate and staircase railing are included. If they're excluded, budget for them before signing (at 304-grade steel rates of about ₹500/kg) and get an independent quote rather than automatically using the contractor's referred vendor.
What they do
If the contract doesn't specify 'paint' or 'polish' for windows and doors, the contractor will default to normal enamel paint — even though most owners end up wanting a PU polish look. If you have a polished look in mind, the contractor will try to steer you away from it, because PU polish is much more expensive.
Real numbers
Real numbers, rates as on September 2026 (India-wide averages — confirm locally): take 11 windows of 8 ft × 5 ft (440 sqft) plus 5 standard doors of 7 ft × 3 ft (105 sqft) — 545 sqft in all. Ordinary enamel paint runs about ₹25-60/sqft, so roughly ₹13,600-₹32,700 for this area. Melamine polish runs about ₹80-130/sqft, roughly ₹43,600-₹70,850. PU (polyurethane) polish runs about ₹150-400/sqft, roughly ₹81,750-₹2,18,000. That's a ₹30,000 to over ₹1.8 lakh gap for the exact same windows and doors, decided purely by one word in the contract.
What you should do
Explicitly state paint or polish (and the brand/grade) for every wood/window/door surface in the contract.
What they do
Builders bring in a separate sub-contractor for almost every trade. These sub-contractors typically work fast at the start, but if their payment isn't on time, they quietly slow down or stop — without ever telling you why your work has stalled. Almost no sub-contractor finishes their portion of work in one continuous stretch.
What you should do
Ask the builder directly, in writing, who each trade's sub-contractor is and get a commitment that payment delays to sub-contractors (which are the builder's responsibility, not yours) won't be used as an excuse for delaying your work.
What they do
If AC fitting (piping, drainage point, wall sleeve) isn't specifically written into the contract, you will end up arranging and paying for it separately and later, often at higher cost since concealed piping needs to happen during wall/plaster work, not after.
What you should do
If you plan to install ACs, get AC piping and drain points built into the electrical/plumbing scope from the start, even if the AC units themselves are bought separately.
What they do
Cheaper, standard-grade cement is what most contractors will use by default for slabs, since it's less expensive per bag.
What you should do
Specify a premium-grade cement brand/type for the slab (lenter) work in the contract. It costs more, but for the single most structurally critical pour in your house, it's worth it.
What they do
It's common, especially in smaller towns, to build only 1-2 floors first and plan to add more floors later — for rental income or a growing family — once the area is more developed and land values go up. But if you tell the contractor you're only building 1 floor for now, they'll use the thinnest rebar (saria) allowed — usually just 8mm, 10mm and 12mm — in the columns, beams and plinth beam. That structure is only designed to safely carry 1-2 floors. Add more floors later, and the existing columns and foundation may not be strong enough — by then it's a structural problem, not a cosmetic one.
What you should do
Before construction starts, tell your architect/structural engineer how many floors you might eventually build (say, up to G+3 or G+4), even if you're only constructing 1-2 now. For a future 4-floor load, columns and the plinth beam typically need a mix of thicker bars (16mm and 20mm) along with the thinner ones — not just 8-12mm. Get this future-load steel specification and column/footing design written into the contract and structural drawing. Reinforcing a foundation after the floors are already up is far more expensive and disruptive than sizing it correctly once, upfront.
What they do
Bathroom floor tiles need to sit about 1-1.5 inch lower than the tile level in the rest of that floor, so water doesn't flow out into the room. This can be achieved without a proper sunken slab too — by just piling extra rubble/gravel fill (bajri) into the bathroom area to raise it. But that fill adds real dead weight onto your slab (lenter), and to keep levels consistent, contractors often end up filling extra material across parts of the whole floor too — not just the bathroom. This raised floor level also eats into your door frame (chaukhat) height, and by the time a false ceiling goes in on top of that, your usable room height shrinks noticeably. The same squeeze hits any floor-to-ceiling wardrobe (almirah) in your contract — with less real height to work with, the contractor uses less material and you end up with less storage space than you expected.
What you should do
Insist on a proper sunken slab (a recessed RCC pour, typically dropped by a couple of inches, in every bathroom on every floor) in the structural drawing itself — not a rubble/gravel fill-up. It keeps the bathroom floor at the right level using far less dead weight, and protects your door frame height, ceiling height, and any full-height wardrobe space from being quietly eaten away.
What they do
Electrical light-point locations, which wall will get a 'designer'/accent treatment and what that design actually is, wall moulding, and staircase-wall moulding are all decisions builders leave open until later — because whatever isn't decided at signing becomes a separate, extra-cost item once you do finally decide it.
What you should do
Finalize and attach light-point layout, the designer wall's exact design, and wall/staircase moulding design to the contract itself before signing, so these are priced in — not billed as afterthoughts.
What they do
Cantilever beams (used for balconies, chajjas and sunshades that stick out without a supporting column underneath) need extra top steel to safely carry the load, since there's no support at the free end. Contractors often try to avoid designing cantilevers at all where they can, and wherever they can't avoid one, their instinct is to save steel — using thinner or fewer bars than the structural design calls for — since that steel doesn't visibly show up in what you can see or measure later.
What you should do
Get every cantilever element's design and steel specification approved and signed off by a structural engineer before casting — don't let the contractor unilaterally decide to skip or under-reinforce a cantilever to save on steel.
What they do
Every plinth beam in the structure should be interconnected at every column, forming one continuous, rigid frame — not a set of separate, disconnected beam segments. Doing this properly takes more labour (bending and lapping steel correctly at every junction) and more steel (extra bends and laps cost material), so a sub-contractor working on a fixed rate has every incentive to skip proper interconnection wherever a junction isn't being closely checked — it saves them effort and steel, at the cost of the structure's overall rigidity.
What you should do
Confirm with your structural engineer that plinth beams are designed as one interconnected frame, and specifically check the junctions during construction — not just the visible beam runs. Since this genuinely costs more labour and steel to do right, get it priced into the contract upfront instead of leaving it to be silently skipped.
What they do
Right after the slab (lenter) is cast, small water-retention borders ('kyariya') need to be built on the roof for curing. For this, the contractor usually sends just one mason and one helper, whose real target is to dump material on the roof fast and get off it — and you're relaxed too, since the 'hard part' feels done. This is exactly where a costly mistake slips through: they build the kyariya out of thick, coarse mortar that doesn't actually hold water — it leaks straight through and does nothing. Separately, contractors often start masonry work on the roof just a few days after casting, well before curing is complete, and if the staircase isn't cast the same day or the next day after the main slab, its exposed steel mesh gets walked on and bent out of shape before it's ever cast.
What you should do
Specify in the contract that curing beds are kept small (several small compartments rather than one big one, for even water coverage), built with an actual 4-6 inch brick border along the full boundary of the roof, and lined with a thin cement slurry so they genuinely hold water — not raw mortar. These beds must stay filled with water for a minimum of 21 days, and no other work — especially masonry — should happen on the roof during that period. Also insist the staircase is cast the same day or the very next day after the main slab, so its steel reinforcement isn't left exposed and disturbed.
What they do
When a builder realises you are about to become his client, he mentally sets a figure — 'this much business has come in'. Everything after that is about protecting his margin inside that number: every detail that isn't written in the contract will be delivered at the cheapest acceptable version, and anything better becomes an 'extra'. During the work he'll say 'we give this at this rate — check anywhere you like', knowing that by then you have no time to shop around.
What you should do
Assume anything not written down will be the cheapest version. Go through the house item by item (stairs, ramp, doors, windows, grills, sink, toilets, gate, railings) and write the exact specification, size, material, grade and model for each into the contract before you sign.
What they do
The contract will say 'granite on stairs', and that's all. It won't define whether each step gets a single granite slab or a double granite layer with a moulded edge (the thick, finished look most people want). When the work starts, the contractor gives you the plain single version and quotes the moulded double-granite look as an extra: 'this is what it costs — ask anywhere'.
What you should do
Write the staircase granite specification in the contract: single or double layer, edge moulding profile, granite type/colour and thickness, and whether risers are covered too.
What they do
If the contract just says 'wooden doors', you won't get solid sagwan (teak) for all of them. Usually only the main door — or only its frame — is teak, and the other doors and frames are made from cheaper wood or flush doors.
What you should do
List every door and frame in the contract with its wood type (solid teak, other hardwood, or flush door), thickness, and finish (paint or PU polish).
What they do
Unless you specify it, windows come with a single shutter. Most owners want double shutters on both sides — one with mosquito mesh (jaali) and one with glass — and the glass itself has many grades (plain, frosted, toughened, reflective, thickness in mm). If it isn't fixed upfront, you get the cheapest option and pay extra for anything better.
What you should do
Decide before signing: single or double shutter, mesh + glass on which sides, the glass type and thickness for each window, and the frame material. Write it into the contract window by window.
What they do
For the roof/terrace grill, the contractor will give you plain ordinary pipe railing by default. CNC-cut jaali panels, MS iron designs or steel designs all cost more, and if you only ask for them during the work, they're billed as extras.
What you should do
Decide the roof grill design upfront — plain pipe, CNC jaali, MS iron design or steel — and write the material, design reference (photo/drawing) and rate in the contract.
What they do
'Kitchen sink' in a contract can mean a cheap thin sink of low-grade steel. A good sink is 304-grade stainless steel, and there are many module types — single bowl, double bowl, bowl with drainboard, different sizes and depths. If you don't fix these, you'll get the cheapest model.
What you should do
Write the sink's steel grade (304), size, number of bowls, drainboard, and brand + model number into the contract, along with the tap model.
What they do
The contractor will happily write a well-known brand name for toilet seats (WC) and fittings. But every brand has many grades and models, from basic to premium, with big price differences. With only the brand written, he can install that brand's cheapest model.
What you should do
Go to a showroom yourself, choose the exact models (WC, wash basin, taps, shower, flush), and write brand + model number for each bathroom in the contract.
What they do
Once the structure is up and you've paid most of the contract amount, the contractor knows you're stuck. He starts demanding money for 'extras' or an advance for the next stage, and hints that work will stop if you don't pay. The owner's fear — 'if he leaves now, who will finish my half-built house?' — is exactly what he's counting on, and most owners give in and pay.
What you should do
Never let payments run ahead of the work done: tie every payment to a measured, completed stage and hold back 25-30% until handover. Add a clause that if the contractor abandons the work, the remaining work will be measured and given to another contractor at his cost, and that every extra must be approved in writing, with a rate, before it is done. Keep photos, measurements and a written record of every payment, so someone else can take over if needed.