ซื้อคอนโดมือสองเพื่อปล่อยเช่า: คุ้มหรือไม่และต้องระวังอะไร

You have been scrolling through listings on a lazy Sunday, and you spot a two-bedroom condo near BTS Bearing for 2.1 million baht. The building is 12 years old, the pool looks decent in the photos, and you start doing quick math on rental yield. Could this be the investment play that finally makes sense? Buying a secondhand condo to rent out is one of the most popular strategies for building passive income in Bangkok. But the gap between a smart deal and a money pit can be surprisingly thin. Let me walk you through what actually matters, based on years of watching people win and lose in this market.

Why Secondhand Condos Attract Rental Investors

The obvious draw is price. A new condo near BTS Thong Lo might start at 180,000 to 250,000 baht per square meter. Walk a few stations down to BTS On Nut or Udom Suk, and secondhand units from 2010 to 2015 regularly trade at 70,000 to 100,000 baht per square meter. That price difference directly impacts your yield calculation because rental prices in those same areas do not drop at the same rate as resale values.

Take a real example. Lumpini Ville On Nut, a project now over 10 years old, sees studio and one-bedroom units listed for resale around 1.5 to 2 million baht. The same units rent out for 8,000 to 12,000 baht per month. Even at the conservative end, that puts your gross yield somewhere around 5 to 6 percent, which is significantly better than the 3 to 4 percent you often see on brand-new projects in the same zone.

According to CBRE Thailand, the average gross rental yield for Bangkok condominiums in 2023 hovered around 4 to 5 percent, but older buildings in well-connected locations frequently outperform that benchmark. The key phrase here is "well-connected." Location always wins.

The Numbers That Actually Matter

Most first-time investors look at one number: gross yield. They take the annual rent, divide by the purchase price, and call it a day. That is a dangerous oversimplification. You need to factor in common area fees, sinking fund top-ups, annual property tax, personal income tax on rental earnings, and periodic renovation costs. These extras can shave 1.5 to 2.5 percentage points off your gross yield.

Here is a scenario that plays out all the time. Someone buys a one-bedroom at Aspire Sukhumvit 48 for 2.3 million baht. Monthly rent comes in at 12,000 baht, so gross yield looks like a healthy 6.3 percent. But common area fees run about 2,000 baht per month. The unit needs new air conditioning and a fresh coat of paint, costing around 40,000 baht upfront. Add in one month of vacancy per year and the annual tax filing with the Thai Revenue Department, and the real net yield settles closer to 4 percent. Still respectable, but not quite the number that got you excited.

Always run a net yield calculation before you commit. Here is a quick formula to keep handy: net yield equals annual rent minus all annual expenses, divided by total acquisition cost including transfer fees and renovations.

Location Picks That Work for Rental Demand

Not every cheap condo is a good rental investment. A secondhand unit near BTS Saphan Khwai priced at 1.8 million baht will find tenants much faster than one near a suburban station with limited foot traffic. Rental demand clusters around transit, offices, universities, and hospitals. That has been true for decades and it is not changing.

The Sukhumvit corridor from BTS Ekkamai through Bearing remains the most reliable rental belt for expat and young professional tenants. One-bedroom units in this stretch typically rent for 10,000 to 18,000 baht per month depending on building quality and proximity to the station. Meanwhile, the MRT Blue Line extension has opened up areas like Huai Khwang and Lat Phrao, where secondhand condos from established developers still trade below 80,000 baht per square meter.

A friend of mine picked up a 28-square-meter studio at Centric Ratchada near MRT Huai Khwang for 1.7 million baht last year. It rents consistently at 10,000 baht per month to young Thai professionals who work in the Ratchadaphisek office towers. That is a gross yield just above 7 percent, and the building juristic team keeps the common areas in solid shape.

Location / Station	Typical Secondhand Price (1BR)	Expected Monthly Rent	Estimated Gross Yield	Primary Tenant Profile
BTS On Nut	1.5 - 2.3 million THB	8,000 - 14,000 THB	5 - 7%	Expats, young professionals
BTS Bearing	1.3 - 2.0 million THB	7,000 - 11,000 THB	5 - 6.5%	Thai office workers, students
MRT Huai Khwang	1.5 - 2.2 million THB	9,000 - 13,000 THB	5.5 - 7%	Thai professionals, freelancers
MRT Lat Phrao	1.4 - 2.0 million THB	8,000 - 12,000 THB	5 - 6.5%	Government employees, couples
BTS Thong Lo (secondhand)	3.5 - 6.0 million THB	18,000 - 35,000 THB	4 - 5%	Expats, corporate tenants

Red Flags to Watch Before You Buy

Buying secondhand means buying someone else's history, and that includes the building's history. The single biggest risk is poor juristic person management. If the management team has let the building deteriorate, if the lobby smells like mildew, if half the elevators are broken, you are going to struggle to attract tenants regardless of price.

Before you put down any money, visit the building in person on a weekday evening. Check the state of the pool, gym, corridors, and parking structure. Talk to the security guards. Ask about water leaks, pest control schedules, and whether the sinking fund balance is healthy. A building with a depleted sinking fund might hit you with a special assessment of 20,000 to 50,000 baht per unit for major repairs. That kind of surprise wipes out an entire year of rental income.

Also check the ratio of owner-occupied units versus rental units. Buildings where more than 60 to 70 percent of units are rented out tend to have higher turnover, more wear and tear, and sometimes looser rule enforcement. Listings on DDproperty often show how many units from a given project are simultaneously available, which gives you a rough sense of supply pressure.

One more thing that catches people off guard: the transfer fee and specific business tax at the Land Department. If the seller has owned the unit for fewer than five years, a 3.3 percent specific business tax applies on the appraised value. The standard split is 50/50 between buyer and seller, but this is negotiable. Always clarify these costs before signing the sale agreement.

Renovation and Furnishing on a Budget

Secondhand units almost always need some level of refreshing before they are tenant-ready. The good news is that a targeted renovation in Bangkok is surprisingly affordable compared to most global cities. A full repaint, new curtains, replacement of the toilet seat and shower fixtures, and a deep clean typically runs between 25,000 and 50,000 baht for a studio or one-bedroom unit.

If the kitchen and bathroom are in rough shape, budget an additional 30,000 to 60,000 baht for countertop resurfacing, new cabinet doors, and updated faucets. Skip the temptation to gut-renovate unless the unit is in truly terrible condition. The goal is clean, functional, and photographable. Tenants searching online make snap decisions based on listing photos, and a bright, well-staged unit rents weeks faster than a dark, cluttered one.

I once helped a friend prep a secondhand two-bedroom unit at Supalai Premier at Asoke near MRT Phetchaburi. The previous owner had left the place looking like 2008. We spent about 55,000 baht on fresh paint, new light fixtures, a basic furniture refresh from IKEA Bang Na, and professional cleaning. The unit went live and had a signed lease within 10 days at 22,000 baht per month. That small upfront spend changed the numbers completely.

Tax and Legal Essentials You Cannot Skip

Rental income in Thailand is subject to personal income tax, filed annually. If you are earning rental income, you need to declare it. The Thai Revenue Department allows a 30 percent standard deduction for rental income, meaning you only pay tax on 70 percent of the rent received. Depending on your total income bracket, effective tax rates on rental earnings typically range from 5 to 15 percent for most small-scale landlords.

Foreign buyers should also note that while you can own a condo unit outright under the Condominium Act, the foreign ownership quota in any building is capped at 49 percent. If a building has already hit that cap, you simply cannot purchase there as a foreigner. Always verify the quota status with the building's juristic person office before going further.

On the lease side, residential leases of three years or less do not require registration at the Land Department. Most Bangkok condo leases are one year, which keeps things simple. But make sure you have a proper written lease agreement covering deposit terms, maintenance responsibilities, and early termination clauses. A well-drafted lease prevents 90 percent of landlord-tenant headaches.

Buying a secondhand condo to rent out in Bangkok can absolutely be a smart financial move, but only if you go in with open eyes. Run the real numbers, inspect the building like you are going to live there yourself, and budget for the unsexy stuff like taxes, repairs, and vacancy gaps. The best deals are not the cheapest ones. They are the ones where every factor lines up: location, building condition, tenant demand, and realistic yield expectations. If you are looking for tenants or want to understand what renters are actually paying in your target area, check out the rental listings and market insights at superagent.co to see how your investment stacks up against real demand.