What Should Actually Be in Your Interior Design Contract in Malaysia

I read a lot of contracts that clients bring us — sometimes before they've signed, sometimes after something's already gone wrong. The pattern I see most often isn't fraud or bad faith. It's a document that never actually functioned as a contract in the first place, even though everyone treated it like one.

Here's what I mean by that, and what I'd want spelled out before I put my name on anything.

Why a one-page quotation isn't a contract

A quotation tells you what something is expected to cost. A contract tells you what happens if it doesn't go as expected — what's included, what isn't, when money changes hands, what counts as late, and what happens if either side wants to walk away. Most of the documents I see homeowners sign are quotations wearing a contract's clothing: a total price, maybe a rough scope in a few bullet points, a bank account number, and a signature line. There's nothing wrong with a quotation as a starting point. The problem is when it's the only document either party ever produces, and everyone quietly agrees to treat "the quote" as if it settles every question that comes up later. It doesn't, because it was never written to.

A proper contract doesn't need to be long or intimidating. It needs to answer the questions that actually cause disputes: what exactly are you getting, when do you pay for it, how long will it take, and what happens when something changes mid-project — because on nearly every renovation, something does.

Scope of work: what should be spelled out

This is the section most quotations skip entirely, and it's the one that matters most. A proper scope of work should specify:

• Materials, by brand and spec — not "laminate flooring" but the actual brand, series, and thickness; not "paint" but the brand and finish. Vague material descriptions are where "but I thought we agreed on X" disputes come from.
• Quantities — how many linear metres of carpentry, how many power points, how many coats of paint. A number attached to a line item is much harder to argue about than a general description.
• Explicit inclusions and exclusions — this is the one people forget. Does the scope include electrical rewiring, or just fittings? Plumbing relocation, or just fixture swaps? Hacking and disposal? If a category of work isn't explicitly listed as included, assume it's excluded, and get that confirmed in writing before you sign — not discovered halfway through the job when someone tells you it's a separate charge.
• Attached drawings or mood boards — layout plans, elevation drawings, material boards, referenced and dated, ideally as signed attachments rather than something exchanged loosely over WhatsApp. If a drawing changes after signing, that revision should be dated and re-attached, not just floating in a chat thread somewhere.

If a designer or contractor is reluctant to put this level of detail in writing, that reluctance is itself useful information.

Payment milestones tied to deliverables

Every payment in a contract should be tied to something you can actually see or verify — not to a calendar date, and not to a single lump-sum deposit due before anything has happened. This is the structure we use at Inzterior, and I think it's a reasonable model regardless of who you end up working with:

A design deposit of roughly 10% starts the design phase — the only payment due before any design work begins. The next payment is due at design sign-off, once you've approved the final design and material selections, not before. A third payment follows once materials are ordered and carpentry production begins. A fourth is due as on-site installation is carried out, matched to what's physically been installed rather than to a fixed date. The final payment is due at handover, once the space is actually complete.

You can read more about how we structure this on our about page. The exact percentages will vary between designers and projects, and I wouldn't trust anyone who insists there's one universal split that's always correct. What matters is the principle, not the numbers: every payment should follow a deliverable you can point to, not precede one.

Timeline and delay clauses

A contract should state an estimated project duration — not a vague "a few months," but a number of working weeks or days from an agreed start date. Just as important, it should say what happens when that estimate slips, because on real renovation sites, it sometimes does. Good contracts distinguish between delays caused by the contractor and delays outside anyone's reasonable control — a materials shipment held up, a building management approval that takes longer than expected, changes the client requests mid-project. Who bears the cost of each kind of delay, and how it gets communicated, should be written down rather than negotiated after the fact when tempers are already short. We go into this in more detail in our renovation timeline guide.

Variation orders

Almost no renovation goes exactly to the original plan — clients change their minds about a material, or a site condition turns up something nobody anticipated. That's normal. What shouldn't be normal is handling those changes verbally. Any change to the agreed scope, price, or timeline after signing should go through a variation order: a short written document describing what's changing, what it costs (or saves), and how it affects the schedule, signed by both sides before the change is carried out. Without this, you end up with exactly the kind of dispute a proper contract was supposed to prevent — one side remembers a verbal "yes, go ahead," the other remembers something slightly different, and there's no document to settle it.

Warranty and defect liability period

Your contract should state a defect liability period after handover — a window during which issues arising from workmanship (not normal wear, and not damage from misuse) get fixed at no extra cost. It should also say what's covered, what's excluded, and how to report an issue during that window. We've written a fuller breakdown of what a reasonable warranty period should look like in our renovation warranty guide — worth reading alongside this one.

Closing

None of this needs to feel adversarial. A well-written contract protects both sides equally — it's as much protection for a good designer against a client who changes their mind without documentation as it is protection for a client against a designer who cuts corners. If you've already got a quote or a draft contract in hand and you're not sure it covers what it should, get in touch — we're happy to review a contract you've already been given and tell you honestly what's missing, no obligation attached.