What to Check Before Buying a Resale Flat in Delhi NCR

How old is the wiring, really?

This is the item with the biggest gap between what it costs to check and what it costs to discover late. Wiring does not fail visibly; it ages, and an old installation in a flat now running two ACs, a geyser, a microwave and an inverter is being asked to do something it was never designed for.

You do not need to be an electrician to read the signals. Look for these:

• The distribution board itself. Open the flap and look, but touch nothing. Old rewirable fuse holders instead of MCBs, no RCCB, a crowded board with wires bunched loosely, or any brown scorch mark around a terminal — each of those points at an installation that is due rather than fine.
• The number of sockets per room. A flat where every room runs off one socket and a nest of extension boards was wired for a different decade. That is not just inconvenience; it is load going through cable that was never sized for it.
• Switch plates that are warm, discoloured or smell faintly of burning. Touch a few switch plates in the rooms with the AC and the geyser. Warmth at a switch is not normal.
• Old round-pin sockets and cloth or brittle-looking cable at any exposed point. These date the installation immediately.
• Ask whether the flat has ever been rewired, and when. If the answer is a shrug, assume it has not been. Our guide on the signs house wiring needs replacing lists each symptom and what it means, and the full house rewiring guide explains what the job actually involves and why the empty-flat window before possession is the cheapest time to do it.

The timing point matters more here than anywhere else on this page. Rewiring means chasing channels into walls, which means dust, debris and repainting. Done in an empty flat between possession and moving in, it is one clean job. Done later, it is that same job plus moving your furniture and living around it.

Seepage history: what the walls are hiding under fresh paint

A resale flat is almost always freshly painted before it is shown. That is normal and not sinister, but it does mean the most useful evidence has just been covered up. So you look for the things paint cannot hide.

• Uneven or bubbled paint texture. Damp under a fresh coat lifts it. Run a hand across the lower part of external walls and the corners of rooms — a slightly rough, powdery or blistered patch in an otherwise smooth wall is old damp, repainted.
• One wall painted a different shade or with a different finish. When a single wall or a single ceiling patch has been redone, ask what was there.
• Hollow-sounding plaster. Tap along a suspect wall with a knuckle. Plaster that has been repeatedly wet loses its bond to the masonry and sounds hollow.
• Salt bloom near the skirting. A faint white powdery crust at floor level is rising damp leaving salts behind. Paint over it and it comes back.
• The ceiling of every room that sits under a bathroom. Yours or a neighbour's. This is the most common source of a recurring stain in a Delhi high-rise.

Then ask the question directly. “Has any wall or ceiling in the flat had a seepage problem, and what was done about it?” A specific answer — a leaking joint above was fixed in a particular year — is reassuring. A vague one is information too. Our guide on wall seepage and waterproofing explains how a professional traces damp to its source, which is the difference between a lasting fix and a repaint that fails in the next monsoon.

Where possible, view the flat during or just after the monsoon. A wall that is going to misbehave will be misbehaving in August. If you are viewing in the dry months, our monsoon home maintenance checklist tells you what the building should have had done before the rains, which is a useful thing to ask about.

Plumbing: the pipes you can see and the ones you cannot

In an older resale flat, concealed plumbing is the thing most likely to force a bathroom to be opened up within a few years. You cannot see it, but you can read it.

• Run every tap, hot and cold, for a full minute. Watch for a brown or cloudy first flush, which points at old galvanised iron pipe corroding inside. Modern plastic pipework does not do that.
• Test pressure with two outlets open at once, and again on the top floor especially, where gravity-fed supply from an overhead tank is weakest.
• Fill each basin and bath and let it out. Slow drainage, gurgling or a smell from a floor trap points at the shared stack, which is a building-level issue rather than a flat-level one.
• Check every stop valve turns. Under basins, behind WCs, and the main inlet. Seized valves are a small thing that becomes a big thing during an emergency.
• Look at the age and layout of the bathrooms honestly. If the fittings are original and the tiles are dated, you are probably redoing at least one bathroom at some point. Our bathroom renovation guide explains what drives that job’s scale, so you can factor it in as a plan rather than a shock.
• Ask about the water source and the tank. Piped supply, borewell, tankers or a combination; who cleans the overhead tank and how often; whether there is an underground sump. Hard borewell water shortens the life of geysers, taps and washing machines, and that is an ongoing cost rather than a one-off. See our water supply and tank tips.

The terrace, the external walls and the rest of the building

You are buying into a building, and on the physical side the building can cost you more than the flat. Two flats can be identical inside and completely different to own.

• Go up to the terrace. Actually go. Look for cracks in the floor and the parapet, ponding water or old water marks, blocked outlets, and whether there is a visible waterproofing coat and what condition it is in. Ask when it was last treated. On a top-floor flat this is the roof over your head — our terrace waterproofing guide covers what a proper treatment involves and why the dry pre-monsoon window is the only time to do it.
• Walk the external face of the building. Streaked walls, damaged plaster, exposed reinforcement, or a long-running overflow stain under a tank all tell you how the building is maintained.
• Look at the stairwell, the shafts and the common areas. Water stains in a shaft, dripping common pipes, or a lift lobby in poor repair are all signals about the society’s upkeep.
• Ask what is coming. Is there a planned exterior painting, lift replacement, tank or plumbing overhaul, and how is such work funded? A large shared work in the pipeline is worth knowing about before you buy, not after.
• Ask what the society actually maintains. The line between shared and private responsibility varies from building to building and it decides who pays for a leaking common stack or a damp external wall. Our guide on what a society or RWA maintains sets out where that line usually falls.

Turning what you found into a plan, not a panic

A long list of findings is normal on any resale flat. The useful step is sorting them into three buckets, because they have very different urgency.

• Must happen before you move in. Anything involving walls, floors, wiring chases or the whole flat — rewiring, seepage treatment, a bathroom, floor work, full painting. All of it is dramatically easier in an empty flat, and doing it in one sequence saves repeated dust and repeated repainting. Our home renovation planning guide covers the order these trades must run in.
• Should happen in the first season. Waterproofing timed to the pre-monsoon window, a tank clean, pest treatment while the flat is still empty.
• Can wait and be watched. Ageing fittings, a dated kitchen, cosmetic wear. Put these in an annual plan rather than a rush — our tip on budgeting for home maintenance spreads them by trade and season.

Get two or three quotes for the big items before you commit to a price on the flat. A quote is free and it converts a vague worry into a number you can plan around. On XpertWorker you can request quotes from independent, ID-verified professionals and compare them; we do not set anyone’s price and we never charge you, and you deal and pay the professional directly. Our guide on hiring a professional without being overcharged covers how to make quotes comparable, which matters most when the work is large.