[Depreciation of old house renovation assets] How do real estate investors evaluate the capital expenditure (CapEx) and resale premium of "mechanical, electrical and water supply and drainage systems"?

Invisible hidden projects: real money in old house investment

In the real estate market in the Greater Taipei area, 30, 40 or even 50-year-old apartments have always been prime targets for real estate investors to conduct "buy low, renovate and resell (flip)" or "long-term rent collection and management" because of their extremely low public utility ratio, large indoor real estate, and usually located in elite mature areas. When conducting object evaluation (Due Diligence), most investors focus on "visible decoration", such as polished floor tiles, imported kitchenware or Nordic style paint. However, seasoned businesspeople in real estate asset management knows. If this capital expenditure (CapEx) is assessed incorrectly, it will directly eat into the profit margin when the property is resold.

Fact check: Reasonable depreciation life and replacement standards for water and electricity systems

When conducting asset valuation and depreciation calculations, real estate and electricity investors should refer to the following physical and safe life spans of core water and electricity components, which will help evaluate the "estimated repair discount" at the time of acquisition:

• Water supply pipes (hot and cold water pipes): In early Taiwanese apartments, galvanized steel pipes (iron pipes) or ordinary PVC plastic pipes were mostly used, and their safe lifespan was about 15 to 20 years. After this period, iron pipes will become severely corroded, clogged and release red water, while plastic pipes will become embrittled and cracked due to long-term exposure to high temperatures of hot water.
• Distribution box and circuit breaker: The safe life of the main switch of the electrical box, the mechanical structure and copper bar of the non-fuse circuit breaker (NFB) is approximately 15 to 20 years. Older circuit breakers may experience "no tripping due to overload" failure, posing a high risk of wire fire.
• Indoor wires (cables): CNS national standards stipulate that the safe service life of general household single-core copper wires (such as Taidian and Walsin Lihua brands) is about 20 to 30 years. If an old house is overloaded for a long time, the wires will deteriorate and become carbonized, which can easily lead to short circuits.

[CapEx Facts] When acquiring an apartment in Taipei that is over 30 years old, no matter how new the previous owner claims to be, as long as he cannot produce "a complete replacement of water and electricity and qualified construction invoices and completion photos", investors should automatically include the CapEx budget for water and electricity renewal (approximately NT$ 150,000 to NT$ 250,000) when making an offer. Yuan) will be deducted directly from the bid amount.

CapEx capital expenditure trends for whole-house water and electricity replacement in Greater Taipei

We take a standard medieval house in Taipei City and New Taipei City with 3 bedrooms, 2 living rooms, and 2 bathrooms, about 30 square meters, as an example to compile a reasonable project budget for the replacement of water and electricity in the whole room:

Asset Premium: How does a utility replacement certificate bring a 15% resale premium?

When conducting real estate flip resale, experienced investors will actively package the "invisible CapEx" as the "most powerful sales point (USP)" to create an excessive resale premium:

• Provide "Full Room Replacement History of Water and Electricity": During the decoration process, record every detail of the water and electricity construction in detail - from photos of the pointer for water and air pressure tests, the packaging and production year of the Taidian wires used, to the construction photos of the white iron double-pressure pipes in the wall. Compile these photos into a "House Health Inspection and Plumbing Resume Booklet" and hand it to potential buyers.
• Attracting owner-occupiers who seek peace of mind: For owner-occupiers in the greater Taipei area (especially newlyweds, first-time buyers or those who are downsizing), they are most afraid of buying a leaky house that is "gold on the outside but shabby on the inside." When investors can produce professionally certified photos of updated water and electricity and a lifetime warranty on pipes, buyers are more than willing to pay an additional 10% to 15% price premium. Because this can save them from the huge trouble and secondary construction cost of having to build walls and repair pipes again after buying it.

Conclusion: Mechanical, electrical and waterways are the security line of defense for the investment value of old houses

In the field of antique house investment in Taipei and New Taipei, rational real estate businessmen should not invest all their funds in flashy soft furnishings. Although the update of water, electricity and water supply and drainage systems cannot directly show the visual effects of Internet beauty in photos, it is the only safety net to prevent major water leakage and damage to assets and power outage fires. Treating water and electricity replacement as a non-negotiable CapEx investment, and systematically packaging and presenting it to future buyers is the golden business logic for reshaping depreciating assets into "high-premium high-quality residences."

The latest standards for catching leaks and regulatory responsibilities in Shuangbei collective housing (2025-2026 practice)

According to Article 10 of the "Apartment Building Management Regulations" of the Ministry of the Interior and the trend of civil water leakage judgments in Shuangbei District Court in recent years, most water leakage disputes in old collective housing focus on the identification and definition of "exclusive parts" and "common parts". The roof platform and the public pipes are jointly owned by all separate owners, and the repair costs should be shared by public funds or all residents in proportion to their shares according to law; if the water supply and drainage pipes inside the floor slabs on the upper and lower floors are damaged, the pipes will be borne exclusively by the users or shared by the upper and lower floors.

At the engineering and technical level, modern professional leak detection has fully introduced non-destructive scientific testing, including "FLIR high-resolution infrared thermal imaging camera" (locating temperature difference leakage paths), "high frequency moisture meter" (measuring the moisture content of deep structures) and "pipeline air pressure and water pressure pressure test" (determining whether hot and cold water pipes are leaking). During construction, do not directly apply elastic cement or oil-based paint on the wet cement layer to seal it. Otherwise, the thermal expansion of internal water vapor will quickly cause the coating to blister and peel off, resulting in more serious powdery wall cancer. The standard construction method must first completely eliminate the water source, wait until the moisture content of the cement structure drops below 8%, and then apply the negative pressure resistant silicic acid permeability crystallized waterproof layer.

Recommendations on independent certificate storage and compensation process for water leakage repair

1. Take photos and videos as evidence immediately: Use rulers to record the leakage range, frequency of water discharge, direction of water mark diffusion, and keep time stamps.
2. Written notification and coordination survey: Officially notify the neighbors through the management committee or a certified letter, and agree on a professional third-party leak detection and appraisal unit recognized by both parties to conduct an on-site survey.
3. The contract states the warranty terms: When signing the contract for the project, be sure to clearly specify the waterproofing warranty period (usually 1 year for partial repairs, and 2 to 5 years for the whole room or roof re-construction), and specify the water test acceptance criteria (such as a 48-hour water storage test in the bathroom shower area) to protect your own asset rights.