How to choose a renovation contractor (and not get burned)

The fastest way to judge a renovation contractor is not their reviews, their showroom or how friendly they are on WhatsApp — it is the quotation they hand you. An honest contractor itemizes; a risky one gives you a single lump-sum line and a suspiciously low price. Everything else in this guide flows from that one habit, because a properly itemized quote is where overcharging, corner-cutting and mid-job "extras" all get exposed before you pay a sen.

Read the quote the way a contractor reads it

Take a typical bathroom job. A proper quote for a Serdang terrace-house bathroom breaks the work into hacking, debris disposal, plumbing rough-in, waterproofing (with the membrane brand and number of coats stated), screeding, tiling (with a tile allowance you can check against), sanitary fittings, and any electrical work. If instead you get one line — "supply and install toilet renovation package: RM 6,800" — you cannot tell what is inside, and you cannot hold anyone to it later.

The line we look for first, every single time, is waterproofing. It is the most expensive thing to fix afterwards and the easiest thing to skip silently, because the bathroom looks identical on handover day whether the membrane went in or not. If the quote does not name the waterproofing system and include a 24-hour ponding test before tiling, assume it is not happening. That one missing line is exactly how a RM 5,000 quote beats a RM 7,000 quote — and how a stain appears on the ceiling below two years later.

Deposits and payment schedule

• A 10–30% deposit is normal. It covers material orders and books your slot. Anything much beyond that is the contractor using your money for someone else's job.
• Progress payments should follow completed stages — for example after hacking and plumbing rough-in, after tiling, balance on handover. You pay for work you can see.
• Never pay 50% or more up front, whatever the discount offered for doing so. Almost every horror story we hear from neighbours around Seri Kembangan and Kajang starts with a big upfront payment.
• Hold the last 5–10% until after handover, once you have flushed, showered and checked the ceiling below for a few days.

Get the warranty in writing — and know what it covers

There are two different warranties in a renovation and contractors love to blur them. The manufacturer's warranty covers the toilet bowl, heater or mixer tap — you get that regardless of who installs it. The workmanship warranty covers the things the contractor actually did: the waterproofing, the pipe joints, the tiling. That one only exists if it is written on the quotation or invoice, with a duration. Ask the specific question: if this bathroom leaks to the floor below within the warranty period, who opens the floor and who pays? The answer — and whether they will put it in writing — tells you most of what you need to know.

Red flags, translated

Ask for photos of the stages you cannot see

The stages that decide whether a renovation lasts are the ones buried under tiles: the waterproofing coats, the pipe joints before they are concealed, the ponding test with water actually standing on the floor. Any contractor can WhatsApp you three photos at each of those points — it costs them nothing. If someone resists documenting the hidden stages of your job, that reluctance is itself the answer.

An honest note about price

Around Serdang, Seri Kembangan, Balakong, Kajang and Bangi, a realistic bathroom refresh runs about RM 3,000–8,000 and a full renovation RM 8,000–22,000 depending on size and fittings — you can sanity-check any quote against our price guide. A quote sitting far below that band is not a bargain; it is a scope gap you have not found yet. And this checklist is not just for judging other people — bring these exact questions to us too. A contractor who gets uncomfortable answering them is telling you something.