[Real Estate Partition Investment Thresholds] The "Lower Floor Owner's Consent" required for renovating suites in Greater Taipei and the indoor fire protection compliance and pit prevention guide

The temptation and compliance risks of box-to-box acquisitions

In Taiwan's real estate investment market, acquiring old apartments with good locations and large indoor square meters (such as more than 30 square meters) in the greater Taipei area (Taipei City and New Taipei City), and redesigning and converting them into rental suites with 4 to 5 private bathrooms is a very classic "asset reorganization and appreciation (Flip)" technique. This approach can transform an apartment that was originally rented out for only 25,000 yuan into a high-quality, high-investment property with a monthly rent of 15,000 yuan per suite and a total rent of more than 60,000 yuan. However, many real estate developers who have just entered the market rush to construct the property after acquisition, but often receive a stop-work order from the construction management office in the middle of the process. They are even complained by neighbors and fined 60,000 to 300,000 yuan. This is because they ignored Shuangbei City's extremely strict "interior decoration review" and "fire safety regulations" for partition suites.

Number One Natural Insurance: Practical Obstacles to the Lower Floor Owner’s Consent

When applying for a "partition room installation" permit in the greater Taipei area, the biggest difficulty faced by all investors is the "Consent Letter from the Owner of the Directly Lower Floor (Directly Below)". According to the apartment building decoration review principles stipulated by Taipei City and New Taipei City Government:

"Whenever two or more bathrooms and toilets are added (inclusive), or the partition wall is changed, a consent form from the owner of the directly below floor must be attached."

The starting point of this regulation is to prevent the excessive load on the floor due to the large number of additional bathrooms (waterway modifications), the failure of the waterproof layer and leakage of water, thereby damaging the property of residents downstairs, and the noise and public security concerns caused by the increase in the number of tenants. In practice, most downstairs neighbors usually refuse to sign because they are worried about water leakage and noise. If the neighbors downstairs refuse to sign, the partition repair plan will not pass the legal review, and starting the construction without permission will be considered an "illegal partition", and it will face water and power cuts and forced demolition at any time. This makes the "consent letter from the lower level" a key vote for the success of hedge investment.

Three major compliance and fire red lines for interior decoration review

If you are lucky enough to obtain the consent for the direct floor below, or if your property is on the first floor and there is no residence directly below, you still need to comply with the following rigid regulatory standards when reporting to the Building Management Office for room repairs:

1. Partition walls and fire-resistant building material requirements: The doors and corridor partition walls of partitioned suites must have a fire resistance of at least 1 hour (usually light steel frame grout walls or fire-resistant gypsum boards are used, and wooden partitions are strictly prohibited). In addition, the door must be a Category A fire door with a "smoke blocking function" to prevent the spread of thick smoke in the event of a fire.
2. Natural lighting and window opening area: According to the technical building regulations, rooms used for residential purposes must have a legal proportion of opening area for external lighting and ventilation (usually more than 1/8 of the floor area of the room). If the rooms are separated on the inside without windows during modification, it will not pass the completion inspection.
3. Review of fire safety equipment and illustrations: When partitions are added, smoke detectors, evacuation directional lights and fire sprinklers inside the room must be reconfigured. Investors must entrust a legal fire equipment engineer to draw fire protection plans, submit them to the fire station for review, and obtain a "Fire Safety Equipment Completion Certificate" after the construction is completed.

Self-protection and risk avoidance strategies for acquiring businessmen

For commercial merchants who specialize in Flip or high-end escrow for old houses, in order to avoid the disaster of stuck funds due to neighbors’ refusal to sign the consent form after the acquisition, the following evaluation should be done on the front end:

• Pre-purchase communication and additional conditions: When signing the sales contract with the owner, you can add "with the consent signed by the owner of the directly below floor" as a requirement for the contract to take effect. Or, before paying for the reservation, take the initiative to visit the residents downstairs, show professional water and electricity piping and waterproofing construction drawings, promise to proactively reinforce the ceiling structure downstairs, and even provide a certain amount of neighbor damage protection fund or sign a "lifetime water leakage warranty cut-off letter" to maximize sincerity and obtain signatures.
• Find specific properties that are consent-free: Prioritize properties that are “first floor apartments” or “entire acquisitions.” Because there is usually a basement or legal open space (for non-residential use) directly below a first-floor apartment, in many review practices, it is exempted from inspection and must be accompanied by a consent form for the lower floor, which can greatly reduce the regulatory uncertainty of investment.
• Planning of legal "double suites" or "large suites": If the consent cannot be obtained, the business model can be adjusted, not targeting 4 to 5 extreme apartments, but changing to legal "double suites" or "one bedroom and one living room" high-end exquisite apartments. Although the number of rooms has decreased, due to its high-end positioning, high single-room rents, high-quality tenants, and low water and electricity repair review thresholds, it can create a more stable and worry-free net return rate (Net IRR).

Conclusion: Compliance is the only cornerstone to ensure return on investment

Separate real estate investment in the Greater Taipei area has bid farewell to the barbaric growth era of "secretly starting construction and cutting off first and then announcing later". Today, when the government and neighbors are increasingly aware of their rights, any anonymous reporting call can wipe out millions of modification projects. For rational businessmen, including the "lower floor consent letter" and "interior fire protection review fee" in the necessary costs of the front-end acquisition assessment, and entrusting an architect to perform standard compliance visas are the golden hedging rules to ensure the sustainable holding of the property, stable rent collection, and smooth resale premium in the future.

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.