Construction Defects Checklist for Delhi Builder Floors

A construction defects checklist is only useful if it tells you what a defect looks like on a finished floor, not what it is called in a specification. Most lists name the problem and stop: dampness, cracks, seepage. This one starts from the other end. It takes the eight things that actually go wrong in Delhi builder floors, describes what each looks like when you are standing in the room, explains what causes it, and gives the cheap test that confirms it.

Timing matters as much as appearance. A mark that shows up in the third month after handover is usually a finishing problem. The same mark in the third year is often a waterproofing or structural one, and the answer is different. However, before any of that, one distinction decides everything else.

First, Separate a Defect From a Snag

A snag is work that was never finished properly: a handle missing, a tile chipped, a door that rubs, a switch that does not work. It is visible on the day you take possession, it is specific, and it has a fix that any finishing team can carry out.

A defect is work that was done and has since failed. The plaster was flat and is now hollow. The terrace drained and now ponds. The wall was dry through one winter and shows a tide mark after the first monsoon.

The difference is not academic. Snags belong on the possession list you hand over before final payment. Defects belong on the defect liability period, which is the contractual window after handover in which the builder is obliged to repair specified failures. Delhi builder floors usually carry a written defect liability period, and what it covers depends on what the agreement says, so read that clause before you argue about a crack. Our guide to the builder floor defect liability period sets out how that clause is normally written and how to use it.

There is a third category buyers mix in: maintenance. A blocked drain, a failed geyser, a sealant weathered after four summers. Those are yours. A list that does not separate the three will report maintenance items as defects and lose credibility on the ones that matter.

Structural, Water, or Finish

Every defect on a builder floor falls into one of three buckets, and the bucket tells you who to call.

• Structural items involve the frame: columns, beams, the slab, the staircase, the foundation. Cracks here follow a pattern, widen, or appear alongside a door that has stopped closing. This is the only bucket where you stop using the room and call a structural engineer.
• Water items involve something that should have stayed outside: the terrace, the bathroom floor, the window sill, the external wall, the plumbing line inside a wall. Water is the single largest cause of builder-floor complaints in Delhi because the city’s monsoon is short and violent, and a small failure is tested hard once a year.
• Finish items are cosmetic until they are not: hollow plaster, drummy tiles, blistering paint, separated skirting. Most are cheap. But blistering paint on a wall that stays wet is a water defect in disguise, and treating it as paint is how a small seep becomes a rotten lintel.

Sort every finding into one of these three before you call anyone. It changes the conversation from “the house has problems” to “the bathroom floor is leaking into the room below, and here is the photograph from the day I tested it”.

The Construction Defects Checklist, Defect by Defect

Eight failures account for most of what buyers find in Delhi builder floors. Work through them in this order, because the cheap checks come first and they tell you where to look harder.

1. Hollow or drummy plaster. Tap the wall with a knuckle or the handle of a screwdriver in a grid across each room. A dull thud instead of a hard tap means the plaster has separated from the masonry behind it. It happens when the wall was not wetted before plastering, when the mortar was too lean, or when a coat went on too thick. Cosmetic in the short term, but it will shell off above a doorway or a window within a few years.
2. Efflorescence, the white salt bloom. Look at the base of walls, the external face, and around bathroom walls on the other side. White powder that keeps returning after you wipe it means moisture is travelling through the masonry and evaporating at the surface. Salts in the bricks and the cement come out with it. Repainting hides it for one season and no longer.
3. Hairline cracks versus settlement cracks. Hairline cracks in plaster, under about 0.3 mm, are normal drying shrinkage and are filled and painted. Cracks wider than that, cracks that are wider at one end, cracks that follow a diagonal from the corner of a door or window, or cracks that repeat on both faces of a wall are the ones that need an engineer. The Bureau of Indian Standards sets the surface crack width limits for reinforced concrete in IS 456, and a crack that exceeds those limits is a design or execution question, not a painting one.
4. Damp patch rising from the floor, or a tide mark at the skirting. This is moisture climbing out of the ground or through a badly detailed junction. On a ground floor it often points to a missing or bridged damp-proof course. On an upper floor the same mark under a bathroom wall points to failed waterproofing above.
5. Seepage at window and door openings. Look for staining on the internal reveal and softness in the plaster under the sill. Water gets in behind the frame because the gap was filled with mortar instead of a proper sealant and backer rod, or because the sill does not slope outwards. This is the most common single defect on upper floors, and it appears in the first heavy rain, not on the day of handover.
6. Ponding on the terrace and dampness on the ceiling below. Pour a bucket of water on the terrace and watch where it goes. Standing water after thirty minutes means the slope is wrong or a drain is blocked. The ceiling stain in the room below is the consequence, usually a season later.
7. Loose or drummy tiles, and hollow-sounding floor tiles. Tap each tile across the floor. A change in sound means the adhesive or mortar bed did not bond. Tiles that sound hollow lift within a year or two, usually at the edges first, and a lifted tile in a bathroom is a water trap.
8. Honeycombing and rust staining on exposed concrete. On a stilt ceiling, a staircase soffit, or a beam, look for patches where the concrete is rough and the aggregate shows, and for brown streaks running down from the reinforcement. Both mean the cover to the steel was short. Brown streaks are the more serious of the two because the bar is already corroding.

How to Test Without an Engineer

You do not need instruments to find most of these. You need a torch, a two-metre straight edge or a spirit level, a bucket, and the patience to visit twice.

• Torch test. Turn off the lights and run a torch beam flat along each wall and ceiling. Raking light shows undulation, patches of filler and the faint outline of a damp area that flat daylight hides.
• Tap test. Knuckle-tap plaster and tile fields in a grid. Mark hollow spots with chalk as you go so you can count them later.
• Straight edge. Hold it against the wall, the floor and the window sill. Check for a gap under the middle, and check that the sill falls outwards rather than inwards.
• Bucket test. Pour water on the bathroom floor and on the terrace, and leave it for half an hour. Where it stands tells you where the slope is wrong. Then look at the ceiling of the room below, ideally the next day.
• Monsoon second visit. If you can, inspect after the first heavy rain of the season. Seepage that nothing else reveals is obvious on that day.

Then fill a bucket at the farthest tap and time the cold run, which exposes a choked line or weak pressure. Finally, switch on every light and the air conditioners together and see whether anything trips; our note on electrical load in a builder floor explains what the sanctioned load should look like.

When Each Defect Usually Appears

The calendar narrows the diagnosis quickly.

• Month one to three: snags, hollow plaster, sticking doors, chipped tiles, paint patches. Almost all finish.
• First monsoon: window seepage, terrace ponding, damp patches on ceilings, efflorescence starting at the wall base.
• Month six to eighteen: tiles lifting at the edges, skirting separating, sealant shrinking at external joints, hairline shrinkage cracks in plaster.
• Year two to five: settlement-related cracks around openings, waterproofing failures in bathrooms, corroded reinforcement beginning to stain.

A defect earlier than its window usually means rushed work; later usually means a material or a detail failed. Neither is automatically the builder’s fault, and neither should be fixed before the cause is found.

Recording a Defect So It Gets Fixed

A list of complaints gets a shrug. A dated record gets a repair.

Photograph each item with a reference object in frame, so scale is visible: a coin against a crack, a spirit level against a sill. Note the room, the wall, the floor, and the date. Keep one running document with an item number for each defect and a single line on what it does, not what you think caused it. Then send it once, in writing, to the builder, and keep the acknowledgement.

If the floor is still under construction when you spot something, raise it at that stage instead of at the end; our guide to snagging inspection in South Delhi covers how a formal snag list is built, and the handover documents page lists what should be in your file when the keys change hands.

What This Checklist Cannot Do

It cannot see inside a wall, test a concrete grade, or tell you whether the foundation suits the load above it. Those need drawings, test results and an engineer. What it can do is stop you signing for a floor with eight known failures, and give you evidence to insist on the few that matter.

For most buyers, that is the whole point. The quality checks before buying cover what to look at while the work is still visible. This checklist covers what to look at once it has been covered up and has had a year to fail.