Most expats, investors and business owners need a lawyer for Koh Chang sooner or later — above all to structure a land lease or property purchase safely, since most of the island's interior is protected national park and foreign land ownership runs through leases or company structures instead. This guide covers what lawyers help with, typical fees in Thai baht, how to tell a lawyer from the island's own immigration office, and how to vet a firm — and avoid nominee traps — before you hand over money.
Thai law is conducted in Thai, follows its own procedures, and treats foreigners very differently in areas like land and company ownership — which matters on Koh Chang, where most of the mountainous interior sits inside Mu Ko Chang National Park and buildable land is genuinely scarce. No law firm sits permanently on the island itself, or in Trat town on the mainland; residents typically use a Pattaya-based firm that explicitly covers the Trat area, or a Bangkok or Koh Samui firm, often by phone or video call. Koh Chang's own immigration office (open since 2024) covers routine reporting and extensions locally, but land, business and full visa work still needs a lawyer. Below is what to hire one for, roughly what it costs in baht, and how to choose a firm you can trust. Fees are typical ranges only; always confirm a written quote and scope with the specific firm.
A large majority of Koh Chang's mountainous interior sits inside Mu Ko Chang National Park, which concentrates buildable, titled land into a narrow west-coast strip and makes access, boundary and protected-area issues genuinely common. Because foreigners cannot own Thai land outright, houses, bungalows and villas here are typically held on a registered long-term lease (up to 30 years, via the Trat Provincial Land Office) or through a Thai limited company with genuine Thai shareholders. A lawyer runs the title search, checks the plot doesn't encroach on park boundaries, and structures the lease or company correctly before you commit capital to a build, renovation or resale purchase.
A Thai company that genuinely trades and has active Thai shareholders can legally hold land for a foreign-run business or home. A company set up purely as a nominee — Thai names on paper holding land only for a foreigner's benefit — is illegal under Thai law, and with Koh Chang's very limited condo stock, land-holding structures are the norm here rather than the exception. A lawyer gives an honest read on whether an existing structure (common on a villa or guesthouse resale) or one you're proposing is genuinely defensible.
Koh Chang has had its own full-time Thai Immigration Office (Klong Prao) since 2024 — a genuine advantage over most of Thailand's smaller resort islands — so most residents handle 90-day reporting and routine extensions of stay locally without a lawyer or even a Trat mainland trip. Lawyers earn their fee on the harder cases the office doesn't resolve: work-permit-linked visas tied to a dive shop or resort, extensions after an overstay, blacklist issues, or an application that's already been refused.
Koh Chang's foreign-run businesses cluster around dive and boat operations out of Bang Bao, guesthouses and resorts along White Sand Beach and Klong Prao, and eco-tourism tied to Mu Ko Chang National Park. A lawyer sets up the Thai limited company, checks the Foreign Business Act licence a dive centre, resort or restaurant needs, arranges work permits for managers and instructors, and drafts commercial leases and staff contracts — turning informal island work into a business a bank or immigration officer recognises as legitimate.
Marrying a Thai partner starts with an affirmation of freedom to marry from your embassy in Bangkok, followed by certified translation and legalisation before registration at the Ko Chang District Office (Amphoe) in Ban Dan Mai, which handles marriage registration for the island. A lawyer can also draft an enforceable prenuptial agreement, which must be registered together with the marriage. If you hold a land lease, company shares in a Koh Chang business, a scooter or a Thai bank account, a bilingual Thai will matters too — without one, an estate is settled under Thai intestacy law, which can strand a foreign spouse without quick access to sort it out.
Indicative ranges gathered from common expat, business-owner and investor matters on and around the island. Government charges, certified translation and legalisation are usually extra unless a firm quotes an all-in fixed fee in writing.
| Service | Typical fee (THB) | Notes |
| Initial consultation | Free - 3,000 | Many firms serving the island offer a free intro call or video meeting |
| Senior lawyer hourly rate | 3,000 - 9,000 / hr | Pattaya, Bangkok or Koh Samui firms serving Trat/Koh Chang sit mid-range |
| Land lease or company-structure due diligence | 35,000 - 80,000 | Title search, park-boundary check, lease or company structuring |
| Lease drafting or review | 5,000 - 18,000 | Long-term land and commercial leases (villas, dive shops, resorts) cost more |
| Thai company setup for business/property | 30,000 - 60,000 | Plus government fees and registered capital |
| Foreign Business Act licence (dive/resort/restaurant) | 20,000 - 45,000 | Often bundled with company setup for tourism ventures |
| Non-routine visa assistance (work permit, refusal, overstay) | 10,000 - 28,000 | Excludes government fees; routine 90-day reporting and extensions are handled free at the island's own immigration office |
| Work permit application | 15,000 - 30,000 | Often bundled with company setup |
| Marriage registration support | 10,000 - 25,000 | Affirmation, translation, legalisation, amphur filing |
| Prenuptial agreement | 15,000 - 38,000 | Must be registered with the marriage to be valid |
| Thai will drafting | 10,000 - 28,000 | Bilingual will covering Thai-situated assets |
| Litigation / court representation | 50,000+ | Highly dependent on the case; factor in travel to the Trat provincial court |
A practising lawyer in Thailand is licensed by the Lawyers Council of Thailand. No permanent law firm is confirmed on Koh Chang itself or in Trat town — Australia's DFAT embassy lawyer directory and the Global Law Lists Thailand directory both list zero firms based in Trat province. Residents typically use a Pattaya-based firm (roughly 4-5 hours away via the Ao Thammachat ferry — the same corridor used for domestic help and elder-care referrals) that explicitly covers the Trat area, or a Bangkok or Koh Samui firm serving Gulf-coast islands remotely, mostly by phone or video call.
Do not rely solely on a lawyer recommended by the seller of a villa, guesthouse or land plot — their job is to close the sale. Engage your own lawyer to run the lease or company-structure due diligence, confirm the plot doesn't sit inside a Mu Ko Chang National Park boundary, and check title cleanly. Given how tight buildable land is on this island, this is the single most common point where a modest fee saves a much larger loss.
Since 2024, Koh Chang's own immigration office in Klong Prao handles routine 90-day reporting and extensions of stay directly — for that, most residents don't need a lawyer or agent at all. Reach for a lawyer when a business-linked work permit, a refused application, an overstay or blacklist issue, or a land or company dispute is involved — anything carrying real legal exposure rather than a form filed at the local office.
Because most lawyers serving Koh Chang work off-island, confirm up front whether meetings happen by video call or require a ferry trip to the mainland, and get a written quote covering government fees, translation, legalisation and any travel costs before you commit. Staged payments tied to milestones protect you far better on a land, company or business matter than a single up-front sum.
Read independent reviews, confirm the firm is Thai-registered, and be wary of anyone pressuring a fast wire transfer or guaranteeing a land-lease or visa outcome. Thailand has no Western-style notary public — ask specifically for a Notarial Services Attorney if you need documents certified for use abroad. Keep every instruction and quote in writing and hold onto official receipts.
It's not legally required but strongly advisable. Most of Koh Chang's interior is protected as Mu Ko Chang National Park, so buildable, titled land is scarce and access or boundary issues are common. Foreigners cannot own Thai land outright, so houses, bungalows and villas are held on a registered long-term lease or through a genuine Thai company structure — a lawyer confirms title and boundaries and structures the deal correctly. Legal fees of roughly 35,000-80,000 THB are modest insurance against a structure that later proves unenforceable.
Not the land itself. Foreigners cannot own Thai land outright, so houses, bungalows and villas on Koh Chang are typically held on a registered long-term lease (commonly up to 30 years, via the Trat Provincial Land Office) or through a Thai limited company with genuine, active Thai shareholders. A pure nominee company set up only to hold land for a foreigner is illegal, so get independent legal advice on structure before you commit.
No permanent law firm is confirmed on Koh Chang or in Trat town — Australia's DFAT embassy lawyer directory and the Global Law Lists Thailand directory both show zero firms listed for Trat province. Residents typically use a Pattaya-based firm (about 4-5 hours away via the Ao Thammachat ferry) that explicitly covers the Trat area, or a Bangkok or Koh Samui firm serving Gulf-coast islands remotely, mostly by phone, email or video call.
It depends on the work. Initial consultations are often free or up to about 3,000 THB, senior lawyers charge roughly 3,000-9,000 THB per hour, and fixed-fee jobs range from about 5,000-18,000 THB for a lease review to 35,000-80,000 THB for land or company due diligence. Always get a written quote covering government fees, translation and any travel.
Koh Chang's own full-time immigration office in Klong Prao (open since 2024) handles routine 90-day reporting and extensions of stay directly, without a lawyer or agent. Use a lawyer for business-linked work permits, refused applications, overstay or blacklist issues, or any land, company or business dispute carrying real legal risk — the island office can't handle those.
Primary and official sources are cited above. Government rules, fees and procedures in Thailand change over time and vary by office; always confirm current requirements with the relevant authority before relying on them. BAANLYY never takes paid placement in editorial content.
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Find your area and residence first, then line up the legal help you need for the lease, business or visa.
Hero photo by Mikhail Nilov on Pexels. General information only, not legal advice; fees, procedures and visa rules change — confirm current details with a licensed Thai lawyer and official sources.