Investing & renting out
What it really costs to own and run a pool villa on Koh Samui, line by line: utilities, pool and garden, staff, maintenance, insurance, estate fees, tax, and the extra costs of letting, with a worked electricity estimate.
In short
- Electricity is usually the biggest bill, driven by air conditioning and pool pumps.
- A tropical island is hard on buildings. Budget a yearly maintenance reserve, not just repairs as they happen.
- Pool and garden care are monthly contracts; staff depend on how you use the villa.
- Letting adds management, commissions, cleaning, laundry and guest supplies, often the largest costs of all.
- Check estate fees, Land and Buildings Tax and who pays what under your lease before you buy.
The purchase price of a villa is only the start. Salt air, humidity, heavy rain and strong sun all take their toll, a private pool needs constant care, and tropical gardens grow fast. If you let the villa, guest turnover adds a second layer of costs. Owners who budget for this from day one enjoy their villa; those who don’t are often surprised in the second or third year. This guide breaks down every cost and how it’s charged. To compare villas, browse villas for sale in Koh Samui.
Costs vary widely with the villa’s size, age, specification and location, and with how you use it. Figures here show how costs are made up; ask us for an estimate for any specific villa.
Utilities
Electricity
Electricity comes from the Provincial Electricity Authority (PEA), metered and billed monthly at progressive residential rates, roughly ฿4–4.5 per unit (kWh) for typical villa consumption. Air conditioning and pool pumps dominate the bill.
Ways to reduce it: inverter air conditioning, a variable-speed pool pump, a timer for the pump, solar panels for daytime loads, and shading and insulation in the design.
Water
Some areas have mains water from the Provincial Waterworks Authority; many rely on wells or delivered water, especially in the dry season. Delivered water is charged per load. Check the supply before you buy, and consider a large storage tank and filtration.
Internet and TV
A monthly fibre package, plus any streaming services. Holiday guests expect fast, reliable Wi-Fi in every room.
Pool, garden and housekeeping
| Service | How it’s usually charged | Notes |
|---|---|---|
| Pool care | Monthly contract | Two or three visits a week, chemicals and minor parts; pumps and filters replaced every few years |
| Garden care | Monthly contract | More for large or hillside gardens; tree cutting extra |
| Housekeeping | Per visit, or a monthly salary | A live-out housekeeper for long stays, or cleaning between guests |
| Villa caretaker | Monthly salary or fee | Checks the property while you’re away; essential in rainy season |
| Security | Estate fee or a separate contract | Gated estates usually include it |
Maintenance and replacement
This is the cost owners most often underestimate. Budget each year for:
- Air-conditioning servicing, two to four times a year.
- Repainting and sealing, as the salt air and sun break down paint and waterproofing.
- Roof, gutters and drainage, checked before the rainy season.
- Pest and termite control.
- Pumps, water heaters and appliances, which wear faster near the sea.
- Soft furnishings and furniture, replaced every few years in a rental villa.
Many owners set aside a fixed maintenance reserve each year, so major items such as repainting or a new pool pump don’t become a surprise. New villas usually have a defects warranty, so costs are lower in the first years.
Insurance
- Buildings insurance for the villa, priced on its rebuild cost.
- Contents insurance for furniture and equipment.
- Public liability, essential if you let to guests.
- Check that the policy covers storms, flooding and rental use.
Estate fees and shared costs
On a managed estate, a monthly or yearly fee covers shared roads, lighting, security, landscaping and sometimes a shared pool. Ask for the current fee, what it includes, how it has changed over the past few years, and how it’s decided.
Tax and legal costs
- Land and Buildings Tax: a yearly tax on the appraised value. Low for residential use, higher for commercial use or vacant land. For a leasehold villa, check whether you or the landowner pays the tax on the land.
- Accounting fees, if the villa is held through a company or let as a business.
- Lease costs: check whether the lease has any annual rent, and budget for registering any renewal.
- Tax on rental income, if you let it.
See property taxes and transfer fees.
Extra costs if you let the villa
| Cost | How it’s charged |
|---|---|
| Management fee | Usually a percentage of rental income |
| Booking platform commission | A percentage of each booking |
| Cleaning and laundry | Per stay |
| Guest supplies | Toiletries, kitchen basics, welcome items |
| Extra utilities | Guests use more air conditioning and water |
| Faster wear and tear | Higher replacement reserve |
| Licensing | Notification or licence costs, where needed |
| Marketing | Photography, listings, website |
Management and commissions together often take a quarter to a third of gross rental income. See how this affects returns in our property investment guide, and the rules in hotel licences and short-term rentals.
First-year costs after you buy
On top of the purchase costs, budget for setting up the villa:
- Transferring utility accounts and any meter deposits.
- Internet installation.
- Furniture, linen and kitchenware, if the villa isn’t sold furnished, or to bring it up to rental standard.
- Professional photography and listing set-up, if you’ll let it.
- A full service of air conditioning, pool equipment and water systems, so you start from a known condition.
- Insurance from the day of transfer.
Preparing for the rainy season
The heaviest rain usually falls between October and December. Before it starts:
- Clear gutters and drains, and check the roof.
- Check retaining walls and slopes for cracks or movement on hillside plots.
- Service the pool pump and check overflow drainage.
- Make sure the caretaker checks the villa after every heavy storm.
A yearly budget template
| Category | Items | How often |
|---|---|---|
| Fixed | Insurance, estate fees, Land and Buildings Tax, internet | Monthly or yearly |
| Services | Pool, garden, caretaker, security | Monthly |
| Usage | Electricity, water, cleaning, supplies | Monthly, rising with occupancy |
| Maintenance | Air-con servicing, pest control, repairs | Quarterly or as needed |
| Reserve | Repainting, pumps, appliances, furniture | Set aside yearly |
| Letting | Management, commissions, laundry, licensing | Per booking or monthly |
Budgeting: a simple framework
- Fixed costs that you pay whether or not you’re there: insurance, estate fees, tax, pool, garden, caretaker, internet.
- Usage costs that rise with occupancy: electricity, water, cleaning, supplies.
- Reserve for maintenance and replacement.
- Letting costs, if you rent it out.
Ask the seller or current manager for the last 12 months of actual bills. It’s the most reliable starting point.
How to keep costs down
- Choose a villa with good build quality, shading, insulation and efficient systems.
- Check water supply and power capacity before you buy. See property due diligence.
- Compare managers on what’s included, not the headline percentage.
- Agree a yearly maintenance plan rather than fixing things as they break.
Villa or condo?
A condo’s common-area fee covers the shared pool, gardens, security and building maintenance, so running costs are lower and more predictable. If low upkeep matters most, see Koh Samui condos.
Frequently asked questions
Usually electricity, mainly air conditioning and the pool pump. If you let the villa, management and commissions are often larger.
Billed monthly by the PEA at roughly ฿4–4.5 per unit. A three-bedroom pool villa in regular use might use 1,500–2,000 units a month, but usage varies widely.
A monthly contract for two or three visits a week plus chemicals, with pumps and filters replaced every few years.
For a well-located, well-managed villa that lets well, often yes. Model it conservatively.
The lease should say. Often the landowner is liable for the land and the villa owner for the building.
If you would rather hand the day-to-day running to someone else, see our property management service.
Want a running-cost estimate for a villa?
We’ll give you an honest estimate for any villa you’re considering.
General information only, not financial or tax advice.