A first-time builder's checklist, in the order it matters
Twenty things, sequenced. Most of them cost nothing and all of them are cheaper before the first brick than after.
Where first-time builders lose money before work starts
You buy a plot and want to start building immediately. You look at floor plans online or ask a builder for an estimate before you define your requirements.
This ordering creates expensive waste. When you change a room layout after masonry starts, you pay twice for materials and labor. When you discover your borewell sits too close to your septic tank, you cannot move either without abandoning expensive work already in the ground.
Building follows a strict order. If you skip steps or reverse them, your budget disappears into site corrections.
The required sequence and the numbers that govern it
House design follows five mandatory phases. The sequence is fixed: establish the land, write the brief, set the envelope, place the rooms, pass the doors, and then locate the services.
Planning also requires budgeting anchors. In 2026 across India, construction costs run ₹1,600–2,000 per sq ft for basic finish, ₹2,000–2,800 per sq ft for standard finish, and ₹2,800–4,500+ per sq ft for premium work. On a 995 sq ft house we drew, a basic rate of ₹1,700 per sq ft gives an estimate of about ₹16.9 lakh. These are planning estimates, not quotations. Only a local contractor with finished structural drawings can quote a firm price.
The physical rules come from established standards:
| Item | Dimension or rule | Source |
|---|---|---|
| Plinth height above ground | +600 mm with a planted swale | Our measured practice |
| Septic tank to borewell | Minimum 18 m separation | TNCDBR 2019 and IS 2470 |
| Septic tank to building | Minimum 15 m, or vent rises 2 m above roof | IS 2470 |
| Foul drainage slope | 100 mm diameter pipe at 1:48 fall | IS 1742 |
| Corridor clear width | Minimum 914 mm inside partition faces | NBC Part 3 |
| Room circulation minimum | Minimum 914 mm clear passage | NBC Part 3 |
| Clear floor beside bed | 914 mm preferred; 600 mm absolute floor | Our practice and IS 8888 |
| Front clearance at W.C. | Minimum 760 mm | Our measured practice |
| Kitchen work aisle | 1220 mm between facing counters | Our measured practice |
| Water supply per person | 135 litres per day | IS 1172 |
| Structural masonry banding | Bands installed to prevent earthquake failure | IS 4326 and IS 13828 |
How to apply the sequence step by step
Start by establishing the land boundaries. Check deed dimensions against the actual physical perimeter. On a plot in Coimbatore district, deed records showed 5,283 sq ft while shoe-string coordinate calculation showed 5,416 sq ft. Resolve discrepancies before drawing lines.
Next, decide what cannot change. You must decide bedroom count, kitchen orientation, plumbing core locations, and waste disposal before drafting. On a 40 × 60 ft plot, the diagonal is roughly 22 m. Because the Tamil Nadu Combined Development and Building Rules 2019 and IS 2470 require 18 m between a borewell and a septic tank, you must fix these at opposite plot corners immediately. On a 30 × 40 ft plot, an 18 m separation cannot fit, meaning the site must depend on municipal water and sewer lines.
Decisions about tile patterns, paint colors, and kitchen joinery finishes can wait. Structural dimensions cannot.
Next, set the envelope using your plot setbacks. On a 30 × 40 ft plot with 1,200 sq ft of land, standard setbacks reduce the built footprint to about 560 sq ft. That area fits two bedrooms. On a 40 × 60 ft plot of 2,400 sq ft, the envelope is about 1,200 sq ft, which fits three bedrooms.
Place rooms using clear circulation. The National Building Code Part 3 requires 914 mm for corridors. In bedrooms, our practice requires 914 mm clear on each side of the bed. Fit the furniture to the room, not the reverse. In a 3,300 mm wide room, a 1520 mm queen bed leaves 890 mm per side. That is 24 mm short of the 914 mm standard. Using a 1370 mm double bed in that 3,300 mm room leaves 965 mm clear, satisfying the standard.
Run a dedicated door review. Every door leaf must sit inside a real wall. Our practice sets a warning whenever a door leaf clears an internal fixture by less than 50 mm.
Finally, lay out services. Build the plinth at +600 mm above finished ground level with a planted swale falling away on all sides. Install horizontal seismic bands to IS 4326 and IS 13828. Embed all electrical conduit, switch back-boxes, soil pipes, and vent ducts directly into the masonry as the walls rise. If you build using stabilised earth or lime mortars, chasing walls after construction cracks the material.
Demand written documents from everyone you hire:
- From your surveyor: a signed boundary drawing showing corner offsets.
- From your structural engineer: a soil test report, foundation sizing, reinforcement schedules, and seismic band placements stamped for municipal permit approval.
- From your contractor: a line-item quotation based strictly on engineered drawings, confirming the 1:48 foul pipe slope under IS 1742 and +600 mm plinth height.
The mistakes this sequence prevents
Skipping the door review creates physical conflicts. On one internal plan check, a 900 mm bedroom door leaf struck a wardrobe face by 567 mm. On another drawing, a bathroom door hit a vanity counter by 290 mm, forcing the vanity to be shortened.
Skipping clear corridor calculations wastes space. On an unchecked plan, a corridor was drawn at 914 mm from rough masonry. Once 110 mm brick partitions were added, the walking route dropped to 804 mm. That error cost 110 mm of usable clearance along the main path in the home.
Ignoring site sanitation rules causes severe contamination. Placing a septic tank soak pit within 18 m of a borewell violates IS 2470 and risks groundwater fouling. Fixing this after drilling requires abandoning a well or building an off-site connection, costing tens of thousands of rupees.
What this means for your plan
Check your boundary dimensions and confirm that your septic tank sits at least 18 m from your water source. Ask your structural engineer to verify that seismic bands follow IS 4326 before masonry starts. The planning tool checks these clearances, door swings, and setback limits automatically when generating your initial layout. You can take that verified brief directly to your licensed architect or engineer for permit drawings.
- PRACTICE: the method's order - establish the land, then the brief, then the envelope, then the rooms, then the doors, then the services
- PRACTICE: the eleven questions, the setbacks, the plinth, the seismic banding and the site services each have their own rule
- MEASURED: our own list of six defects found in a set of drawings that had passed a careful human review
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