[A must-read for real estate traders and investors] How to estimate the repair budget when buying an old house and renovating it? Concealed Works Inspection and CapEx Financial Risk Assessment for Commercial Acquirers
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[A must-read for real estate traders and investors] How to estimate the repair budget when buying an old house and renovating it? Concealed Works Inspection and CapEx Financial Risk Assessment for Commercial Acquirers

✍️ SOSfix Technical Engineering Team⏱️ 6 min read📅 Published: 2026-09-09T09:29:46+08:00

The hidden budget of real estate reorganization: Why are old apartment renovations so expensive?

In the greater Taipei area, purchasing old apartments that are 30 to 50 years old, re-planning and renovating them, then renting them out to white-collar workers, or reselling them in high-end flips, is the core profit model for many real estate investment merchants and asset management companies. However, when evaluating acquisition projects, many businessmen often estimate decoration costs based only on the visual "pattern" and "paint tiles". However, they discover after demolition begins: the water pressure in the water main is extremely low and requires the installation of a pressurized pump and the replacement of pipes throughout the building; the "total amperage" of the building's distribution box has been locked by Taipower and cannot apply for an increase; or the main sewage pipe of the building has long been deformed and cracked. These "hidden engineering defects" buried in walls and underground often lead to additional early-stage CapEx (capital expenditure) of up to hundreds of thousands of dollars, directly burning the expected profit rate (IRR), and even leading to losses for the entire investment project. Therefore, in the early stages of acquiring old houses, introducing the "Concealed Works Home Inspection Method for Commercial Acquirers" and actuating hidden defects are necessary financial skills to avoid landmines.

Four concealed engineering home inspection tips for commercial buyers

Before purchasing an old house, commercial investors should assign their own inspection technicians to focus on the following four disaster areas that are likely to cause CapEx expansion:
1. Total power consumption (amperage) and Taipower's additional transfer assessment:
- Many old apartments have only 30A main meter switches. Or 50A, while a modern three-bedroom and two-living room (multiple inverter air conditioners, microwave ovens, washing and drying machines) requires at least 75A to 100A. Businessmen must confirm whether the "space between weak current pipes" and "transformer capacity" of the building are sufficient. If the building's aging pipelines cannot be extended, or if Taipower refuses to apply for an increase in power supply, the property's power consumption will be permanently limited. Once the air conditioner and water heater are turned on at the same time, the power will trip, which will severely discount its selling price and rental valuation.
2. Assessment of water main hydrostatic pressure and tap water meter modification:
- When checking water pressure, a digital water pressure needle must be locked at the faucet end to check whether the inlet water pressure is lower than 0.8 kg/cm². If the water pressure is too low (which often occurs on the 4th or 5th floor of old apartments), the representative must replace the galvanized stainless steel water supply pipes in the entire room and add an electronic voltage-stabilizing and pressurizing motor. This will directly generate an additional CapEx of NT$50,000 - NT$80,000.
3. Sewage main pipe knocking and pipe photography between pipes:
- The main pipes of medieval houses (especially the turning point between the first and second floors) are often semi-blocked due to long-term oil accumulation and cement mortar accumulation. When viewing a house, large-flow watering should be carried out, and a pipe endoscope should be used to detect the turning point of the pipes on the second floor to evaluate whether high-pressure water jet cleaning is needed or drainage on the same floor should be changed to prevent devastating neighborhood damage caused by sewage backflow in the future.
4. Whether the structural shear walls and girders are illegally damaged:
- Check whether the previous owner demolished load-bearing walls (structural walls) or drilled holes in the beams in order to expand the space. Once a beam is found to be cracked or the structural steel bars are exposed (a sign of a sea sand house), it will face the fate of being fined by the Public Works Bureau at any time and forced to make reinforcements within a time limit. The cost of modification will be difficult to estimate.

Capital Expenditure (CapEx) Valuation Market for Hidden Works and Repairs of Old Houses

When acquiring an old apartment in the Shuangbei area, the following hidden work repair prices should be directly included in the financial model of the acquisition assessment:
* For a 30-square meter interior, the cost of labor and materials is approximately NT$ 80,000 to NT$ 130,000.
* The cost is approximately NT$ 120,000 to NT$ 180,000 per household.
* Fees range from approximately NT$ 35,000 to NT$ 65,000.
* The cost is about NT$ 12,000 to NT$ 25,000 / time.

Commercial acquisitions and businessmen’s long-term asset thinking: Hidden project house inspection is the talisman for purchase negotiation and profit maximization

For real estate businessmen who focus on the reorganization of old houses in Taipei and New Taipei, During the offer negotiation stage, the businessman can present a report on scientific deficiencies measured by his own professional technicians such as "electrical leakage and flashing in the distribution box, water pressure in the cold water pipe is only 0.4 kg/cm² and is rusty and leaking, the total electricity consumption is only 30A, and there is no remaining space between the building's pipes to extend the wires." He can confidently ask the former owner to give up the price to 500,000 to 500,000 in the sales contract on the grounds of "major structural and mechanical and electrical repair defects." 800,000. After the businessman gets back these bargaining deductions, he can work with a professional water and electricity team to repair the property at a wholesale cost lower than the market price. This not only converts hidden risks into profit margins, but also ensures that the renovated property has an excellent selling point in the market of "new water and electricity pipelines and large power safety", increasing the asset selling price premium and maximizing the IRR.

🇹🇼 Expat Living Note: Home Repairs in Taiwan

If you are an international resident renting an apartment in Taipei, New Taipei, or anywhere in Taiwan:

  • Voltage & Electrical Safety: Taiwan standard household voltage is 110V (60Hz). Do not plug 220V imported European/UK appliances directly without a certified step-up transformer.
  • Plumbing Terminology: Local plumbers are called 水電 (Shuǐdiàn) and handle both water and electrical repairs.
  • Landlord Obligations: Under Article 429 of Taiwan Civil Code, landlords are legally responsible for repairing natural wear and tear (such as hidden wall pipe leaks, water heater faults, or booster pump failures) unless explicitly waived in your lease.

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