Hiring a Renovation Contractor in Bangkok: 12 Red Flags and a Safer Way to Pay

Ask around in Bangkok and you will hear the same story more often than you would like. A contractor gave a good price, took a large deposit, worked for a few days, then the visits became irregular, the messages went unanswered, and the job was left half-done. It is common enough that Thai has a phrase for it: ช่างทิ้งงาน, the contractor who abandons the job.

The people this happens to are not careless. They usually picked someone recommended by a friend, at a reasonable price. What went wrong was nearly always visible beforehand: in the quote, in the payment terms, or in how the contractor answered simple questions.

This guide lists the warning signs and, more usefully, explains how to set up a job so that even if you pick the wrong contractor, you cannot lose much.

The one rule that matters most

Never pay much more than the value of the work you have already seen.

Almost every contractor horror story comes down to money paid ahead of work. If your payments follow the work, a contractor who walks away leaves with little of yours. If your payments run ahead of the work, they leave with a lot.

Everything else in this guide supports that rule.

12 red flags

About the price

1. Only a verbal price, or a single number on a LINE message. Without a written, itemised quote, there is no agreed scope to hold anyone to.

2. A lump sum with no breakdown. "Bathroom, ฿40,000" tells you nothing. A real quote says what is removed, what is installed, which materials, and what is not included.

3. Materials not named. "Good paint" and "SPC floor" are not specifications. Ask for the brand, the product and the colour or plank code. Otherwise the cheapest version can appear on site.

4. A price far below everyone else's. Contractors buy similar materials at similar prices. When one quote is much lower, something is usually missing — most often preparation: filling, priming, levelling, cutting out old grout properly. You cannot see skipped preparation on day one. You see it three months later.

5. "This price is only for today." Pressure to decide immediately is a sales tactic. A genuine quote stays valid long enough for you to compare.

About the payments

6. Most of the money before work starts. A deposit to secure the dates and buy materials is normal. Paying most or all of the price up front, especially on a long job, is how people get caught.

7. Cash only, no receipts. Ask for a receipt for every payment, and an invoice or tax invoice from a company. Payments by bank transfer leave a record on their own.

8. Extras with no written price. "While we are here, we will also do this" is how a ฿50,000 job becomes ฿80,000. Every change should be priced in writing and agreed before it is done.

About the contractor

9. No company details. Ask for the registered company name, tax ID and address. You can check that a company is registered with Thailand's Department of Business Development. Individual tradespeople can be excellent, but you should still know who you are dealing with.

10. Nothing to show. A contractor who does good work can show recent jobs — photos with dates, or clients you can talk to. A collection of stock images or someone else's project photos is a warning.

11. No site visit for a substantial job. A fixed price for retiling a bathroom or flooring a house, given from a single photo, is a guess. Guesses become "extras" later.

12. Vague answers about the building and the crew. In a condo, the contractor must provide a worker list and follow the juristic office's rules. If they do not know what you mean, or cannot say who will be on site each day, expect delays and problems at the lift. Our guide to juristic office renovation rules explains what buildings ask for.

What a proper quote includes

Before you agree to anything, the quote should state:

• the scope, room by room: what is repaired, removed, installed and finished
• materials by brand, product and code, and quantities where relevant
• what is excluded, so there are no surprises
• start and finish dates, and working hours if it is a condo
• the payment schedule, tied to stages of work
• how changes are priced, in writing before they are done
• protection, waste removal and cleaning
• the guarantee, in writing: what it covers and for how long
• who is responsible for damage, and whether the contractor carries liability insurance

If two quotes contain all of this, you can compare them fairly. If one contains half of it, you are comparing a promise with a guess.

A safer way to pay

How you structure payments matters more than how much you pay.

Short jobs, a few days: a deposit to start, the balance after you have walked every room and are satisfied. Around half and half is common. Small jobs can be paid entirely on completion.

Longer jobs, weeks: stage payments tied to milestones you can check, for example:

1. a deposit to secure dates and order materials
2. a payment when demolition and preparation are finished and you have inspected them
3. a payment when the main work is complete
4. the final payment after the walk-through and any fixes

Holding back a small final amount until the snag list is done is a fair practice on larger jobs, and a good contractor will expect it.

Always pay by bank transfer to the company account, and keep the receipts.

Keep a record of everything

If a dispute ever happens, records decide it. Keep:

• the written quote and any agreed changes
• every receipt and transfer slip
• your LINE or WhatsApp messages with the contractor
• dated photos of the work at each stage

A good contractor keeps the same records and shares them. A photo report at the end, with before and after pictures of each room and the materials used, protects both sides — and is also what you want when you rent or sell the property.

If a contractor stops turning up

1. Stop paying. Do not pay further stages for work that has not been done.
2. Document everything with dated photos of the current state.
3. Send a written notice through the channel you used, stating what remains to be done and a deadline.
4. Keep the evidence together: quote, receipts, messages, photos.
5. Get help if needed. Thailand's Office of the Consumer Protection Board accepts consumer complaints. For large losses, take legal advice.

Then get the remaining work quoted separately, by someone who will survey what is actually there.

How RenoRova works

We built RenoRova around the problems in this guide, because we kept hearing them from CleanRova clients at the door. Every job starts with a free survey or good photos, and a fixed written quote that names the materials. You pay 50% to start and 50% at the walk-through once you have checked every room, and jobs under ฿10,000 are paid on completion. Every job is insured, ends with a before and after photo report, and carries a two-year workmanship guarantee in writing.

Our guide to condo renovation costs in Bangkok shows typical prices by size, so you have a benchmark for any quote, ours included. See the pricing page, or send photos on LINE for a guide price the same day.