Starting a UPVC window fabrication business in Tamil Nadu requires roughly four things: a 800–2,000 sq ft workshop, core machinery (cutting, welding, corner cleaning), a reliable profile supply line, and your first three months of orders — typically sourced from local builders and contractors. The market is growing as construction converts from wood and aluminium. Here's a practical launch roadmap.
Step 1 — The Workshop
You need covered space for: 6 m profile storage racks (flat, shaded), a cutting station, welding and cleaning stations, glazing/assembly tables, and finished-window staging. 1,000–1,500 sq ft runs a comfortable small operation. Three-phase power for machinery. Location matters less than access — profiles arrive by truck and windows leave by tempo.
Step 2 — Core Machinery
- Profile cutting saw (double-mitre saves labour; single-head starts cheaper)
- Welding machine (two-head minimum for production; four-head for scale)
- Corner cleaning machine (manual chisel work caps your finish quality)
- Steel cutting saw for reinforcement, plus routers for drainage slots and hardware prep
- Hand tools: gasket rollers, glazing paddles, drills, measuring kit
Entry-level Indian machinery lines start far below imported lines — begin there; upgrade heads and automation with volume.
Step 3 — The Supply Line (Your Real Moat)
Fabricators fail on supply more than on skill: a stalled bench with three site deadlines is the nightmare scenario. Qualify a manufacturer-backed supplier on the 12-point checklist, then structure the relationship: standing monthly rates, complete-system orders (profile + steel + gaskets + hardware on one invoice), and a stocked warehouse within a day's truck run. Our fabricator partner program is built exactly for new units — tiered pricing from the first order, technical data for every section, and same-day loading from Chennai warehouses.
Step 4 — Registrations & Basics
GST registration (your B2B buyers need input credit), current account, Udyam (MSME) registration for scheme access, and basic workshop insurance. Price every quote with GST shown — builders take unregistered vendors less seriously.
Step 5 — First Orders
- Site engineers and contractors you already know are the warmest channel — one villa's windows proves your bench.
- Small builders (single-block apartments) value a responsive local fabricator over big-brand lead times.
- Sample window on a stand — a working casement + slider demo unit sells better than any catalogue.
- Referral loop: suppliers meet homeowner demand daily; as a B2B-only house we pass those enquiries to partner fabricators in each area.
Unit Economics Snapshot
| Cost head | Share of window price (typical) |
|---|---|
| Profile + steel + hardware + glass | 55–70% |
| Labour + consumables | 10–15% |
| Installation + transport | 5–10% |
| Gross margin target | 15–25% |
Material dominates — which is why your buying terms (see the wholesale buying guide) decide your margin more than your pricing does.
FAQ
Q: How much capital does a starter unit need?
Workshop deposit + entry machinery + opening material stock + 3 months working capital. Machinery is the variable — start single-head and scale.
Q: Do I need prior fabrication experience?
Hire one experienced bench lead; machinery suppliers train operators. Your job is orders and supply discipline.
Q: Will Three Diamond supply a brand-new unit?
Yes — the fabricator program onboards new units with samples, section data and starter pricing.
Related: the distribution side of the business and Chennai supply logistics.