You do not need to be an engineer to catch most problems on a building site. You need to know what to look at, and to look at it on the right day.
Almost every serious construction defect is easy to fix while the work is open and very hard to fix once it is covered. This is a list of what to check at each stage.
Before work starts
- Sanctioned plan is in your hand, not "coming next week"
- Structural drawings from a licensed engineer, including a bar bending schedule
- Setbacks marked on the ground and measured with a tape by you
- Soil test done if the site is filled land, near a water body, or in a known problem area
Excavation and foundation
What to check:
- Depth matches the drawing, not what looked reasonable
- Soil at the bottom is firm, not loose fill
- Footing sizes match the drawing
- Steel diameter and spacing match the bar bending schedule
- Cover blocks under the steel so it does not touch the earth
Cover blocks are the one people skip. Steel sitting directly on soil will rust from below and you will not know for fifteen years. They cost almost nothing.
Plinth
- Anti-termite treatment done before the plinth is filled
- Filling is compacted in layers, not dumped in one go
- Damp proof course laid across the full width
- Plinth level is above road level — check this, and think about the worst monsoon you remember
Columns
- Columns are vertical. Check with a plumb bob, not by eye.
- Stirrup spacing is closer near beam junctions, as the drawing shows
- Steel laps are staggered, not all at the same height
- Concrete is properly vibrated — no honeycomb gaps when shuttering comes off
Slab — the day that matters most
Slab casting is the single most important day of your build. Be on site. If you can only visit once a month, visit on a slab day.
Before the pour:
- Steel diameter, spacing and layers match the drawing
- Cover blocks in place everywhere
- Electrical conduits and plumbing sleeves already laid — after the pour it means breaking concrete
- Shuttering is tight, level and properly propped
- Enough material on site to finish in one go
After the pour:
- Curing starts within 24 hours and continues for at least 14 days
- Keep it genuinely wet, not sprinkled once a day
Poor curing is the most common cause of weak concrete in India, and it is entirely free to do properly. It just needs someone to care.
Brickwork
- Bricks soaked before laying — but AAC blocks must not be soaked
- Joints are filled, not hollow
- Walls are plumb and courses are level
- Door and window openings match the drawing sizes
Electrical and plumbing (before plaster)
This is your last easy chance. Once plaster goes on, every change means breaking a wall.
- Walk each room and picture your furniture. Are the switches and sockets where you will want them?
- Enough points — people almost always regret having too few
- Separate circuit for the AC, geyser and kitchen
- Plumbing tested under pressure before it is covered
- Photograph every wall before plastering
Plaster
- Surface wetted before plastering
- Thickness is even — check with a straight edge
- Plaster cured for at least 7 days
- No hollow sounds when tapped
Waterproofing
- Terrace has proper slope towards outlets — pour a bucket of water and watch where it goes
- Bathroom floors and walls treated up to at least 3 feet
- Overhead tank and sump treated inside
- Terrace flooded for 48 hours as a test before anything is laid on top
Do the flood test. Finding a leak now costs a day. Finding it after the flooring is laid costs a month.
Flooring and finishing
- Tiles from the same batch — different batches vary in shade
- Tap each laid tile; a hollow sound means poor bedding and it will crack
- Slope in bathrooms and utility runs towards the drain
- Doors and windows open and close fully
Before the final payment
Walk the whole house with a list:
- Every switch, socket and light tested
- Every tap and flush run
- Every door and window opened and locked
- All drains run with a bucket of water
- Terrace and bathrooms checked for damp after a wash
Hold the last 5% until this list is clean. It is the only leverage you have, and the end of a project is exactly when small pending items stop getting done.
If you can only visit five times
Make it these:
- Setback marking — the one mistake that cannot be undone
- Foundation steel, before concrete
- Slab casting day, from morning
- Before plaster, with the electrical layout
- Terrace flood test
Those five days carry most of the risk in the whole build.
What to carry to site
None of this is specialist equipment and all of it earns its place:
| Item | What it is for |
|---|---|
| Measuring tape, 5 m | Setbacks, room sizes, opening sizes |
| Spirit level | Checking walls and floors are true |
| Plumb bob or a heavy nut on string | Checking columns are vertical |
| Torch | Looking into footings, tanks and shuttering |
| Phone camera | The most valuable tool on the list |
| The structural drawing | So you can check steel against what was designed |
Curing: the free thing nobody does properly
Concrete does not dry — it cures, chemically, and it needs water to do it. Stop the water early and you permanently lose strength in the thing everything else sits on.
| Element | Minimum curing | Method |
|---|---|---|
| Slab | 14 days | Ponding — bund the edges and keep water standing |
| Columns and beams | 7 – 10 days | Wet gunny bags wrapped around |
| Brickwork | 7 days | Sprinkling twice daily |
| Plaster | 7 days | Sprinkling twice daily |
Ponding a slab means building a small mud bund around the edge and keeping water standing on it. Sprinkling once in the morning is not curing — the surface is dry within an hour in Indian heat.
Season changes what you should watch
| Season | What to watch |
|---|---|
| Peak summer | Curing dries out fast. Pour early morning or evening, never at noon. |
| Monsoon | Cement storage, waterlogged excavation, wet sand throwing off the mix |
| Winter, north India | Concrete gains strength slowly. Do not strip shuttering early. |
Wet sand during monsoon is the quiet one. Sand carrying water changes the water-cement ratio of every batch mixed with it, and nobody adjusts for it unless someone asks.
Things you cannot fix later
Most site mistakes are recoverable at some cost. These are not, so they deserve the most attention:
- Setback violations. Legal problem, potentially years later, no cheap fix.
- Foundation depth or footing size. Buried before anyone can check.
- Steel in the slab. Once poured, invisible forever.
- Plinth below road level. Guarantees water in the house eventually.
- Cold joint in a slab. Permanent weak line, caused by running out of material mid-pour.
- Missing conduits. Means breaking finished concrete to add them.
The handover checklist
Walk the house with this list before the final payment:
| Check | How |
|---|---|
| Every switch and socket | Carry a phone charger and test each one |
| Every tap and flush | Run them all, watch for slow drains |
| Every door and window | Open fully, close fully, lock |
| Floor slopes in wet areas | Pour a bucket, see where the water goes |
| Terrace drainage | Same test, at each outlet |
| Tile bedding | Tap across the floor and listen for hollow patches |
| Damp patches | Check bathroom-adjacent walls a day after a wash |
| Paint finish | Look along the wall at a low angle, not straight on |
Questions people ask
I have no technical background. Can I really check this?
Yes. Nothing on this list needs an engineering degree. Measuring a setback, counting bars against a drawing, tapping a tile, pouring a bucket of water — anyone can do all of it. What matters is turning up on the right day.
Will the contractor mind me checking?
A good one will not, and several will work more carefully because someone is paying attention. If a contractor actively discourages you from visiting, that itself is information.
Should I hire someone to supervise instead?
If you genuinely cannot visit, yes. An independent site engineer visiting twice a week costs roughly Rs 8,000 to Rs 15,000 a month and will catch things you would not. On a 15 month build that is a small fraction of the project.
What if I find something wrong after the work is covered?
Raise it in writing immediately, with photographs. The defect liability clause in your agreement covers this — which is exactly why that clause belongs in the agreement.