Bathroom Specification Template (India): Materials, Workmanship & Approved-Equivalent Clauses

A drawing tells the contractor where things go. The specification tells them what those things are — the exact tile, adhesive, waterproofing membrane, WC and tap, down to the make, size and IS reference. Without it, the contractor prices the cheapest thing that looks vaguely right, and you discover the substitution only when it fails. This document is the written half of your design intent: the schedule of materials, the workmanship standard each trade must meet, and the clauses that control substitution. Issue it with the BOQ and the drawings and it becomes contractual — the yardstick every delivery and every finished surface is measured against.

How to use this document

The specification is written once, early — after the design is frozen and before the BOQ goes out for pricing. The designer or architect writes it; the site engineer enforces it; the contractor prices and builds to it. Copy the tables below into your own project file and edit every row to your actual selections. Delete nothing structural — if a row does not apply, write "not in scope" rather than leaving a gap a contractor can exploit.

• Write it after the design freezes, so makes and sizes are real, not placeholders.
• Issue it as a set with the BOQ and drawings; the three must agree, item for item.
• One row per element — never bundle "tiling" into a single line; split wall, floor, adhesive and grout.
• Name a make plus an equivalent standard, so quality is defined even when the brand is swapped.
• Cross-reference the drawings — the spec says what, the drawing says where, the fixture schedule says which one and how many.

The specification is a contract document. If it is not written down, it is not specified — and anything not specified will be delivered at the lowest price the contractor can find. Say exactly what you mean, in numbers and makes, once.

Performance vs prescriptive specifications

Every line you write is one of two kinds. A prescriptive spec names the exact product — "AAC-grade cement-based waterproofing, Make: Dr. Fixit / Fosroc / MYK Laticrete or approved equivalent." You control the outcome but carry the risk that the named product is the only one allowed. A performance spec names the result the material must achieve — "waterproofing system to withstand 24-hour ponding with zero seepage, two coats minimum, applied per manufacturer's data sheet." The contractor chooses the product but owns the result. Good bathroom specs mix both: prescriptive for anything visible or safety-critical (tiles, sanitaryware, waterproofing), performance for buried or system items (falls, ponding test, adhesion). The phrase "or approved equivalent" is the hinge between them — it lets a contractor propose a substitute, but only one you approve in writing against the named standard.

1 · Materials specification schedule

This is the core deliverable — one row per element, priced against a named make and an IS reference or equivalent standard. Rates are illustrative and vary by city and specification; the point of the row is the description, not the number. Copy the table and replace every value with your project's actual selection.

2 · Workmanship & method of execution

Materials pass or fail on how they are installed. This table sets the method each trade must follow and the acceptance test that closes it out. Cross-check it against your bathroom design checklist so nothing is specified in one document and forgotten in the other.

3 · Approved-equivalent & sample-approval clauses

Substitution is where a spec quietly dies. These clauses keep control with the designer. Paste them verbatim and edit the bracketed values.

Common mistakes

• Bundling trades into one line — "supply and fix tiling" with no adhesive, grout, waterproofing or IS grade named. Split every layer.
• Naming a make but no standard — if the brand is unavailable, the contractor has no quality benchmark to substitute against. Always add the IS reference or "equivalent" wording.
• No sample-approval clause — you cannot reject a wrong shade you never approved. Keep signed samples on site.
• Spec, BOQ and drawing disagreeing — a tile size in the drawing that the spec never mentions is a variation waiting to happen. Reconcile all three before issue.
• Verbal substitutions on site — the single biggest cause of a finished bathroom not matching the design. Insist every change goes through a written variation.

A template is a starting point, not a final document. Verify every row against your actual project, the signed contract, current IS codes and a licensed professional before it goes out for pricing. Rates and makes shift; the discipline of writing it down does not.

Related resources & guides

• Bathroom design checklist (India) — the pillar checklist this spec supports.
• Bathroom BOQ template (India) — price every specified item, line by line.
• Bathroom fixture schedule (India) — tag which fixture goes where and how many.
• Sanitaryware IS standards (India) — the code references to cite in your spec rows.