How much does it cost to completely update the water and electricity in an old apartment? Real quotation form for 30-year-old house

6 water and electricity danger signs in a 30-year-old apartment

Most of the water and electricity pipelines in old apartments that are more than 30 years old are aging. If the following conditions occur, it means that the system may be nearing the end of its service life:

• The frequency of power outages increases, especially when multiple electrical appliances are used at the same time
• Repeated water leakage from water pipe joints
• The wall socket occasionally generates abnormal heat
• The distribution box is an old model without leakage protection
• Water pressure fluctuates, gets hot and cold
• The water coming out of the water pipe occasionally has a rust color

You don’t have to replace everything, just do these 3 assessments first

Not every old apartment needs a complete update. It is recommended that you first ask a master to check whether the distribution box complies with current safety regulations, whether the water pipe material has been corroded, and whether the leakage points are concentrated in specific areas, and then decide whether to fully update or partial treatment.

Disassembly analysis: three major systems of water, electricity and distribution

Water system: Old galvanized iron pipes are prone to rust and produce molten iron. It is recommended to replace them with stainless steel or PVC pipes. Circuit system: The aging insulation of old wires is prone to short circuits and requires a complete redraw. Distribution box: Many old apartments still use old distribution boxes without leakage circuit breakers. It is recommended to give priority to updating, which is directly related to home electricity safety.

Unit price list for whole-house water and electricity renewal projects

Priority order that can be done separately

Real cases: Price reference for 20 square meters, 35 square meters, and 50 square meters

• 20 square meters old apartment: The whole house water and electricity update is about 80,000-150,000 yuan
• 35ping old apartment: The whole house water and electricity update costs about 150,000-250,000 yuan
• 50 square meters or large house: The whole house water and electricity update is about 250,000-400,000 yuan, depending on the complexity of power distribution

The above is the general market range. The actual quotation still depends on the direction of the on-site pipeline, the difficulty of demolition and repair, and the floor conditions.

Find a master vs. find a design company vs. outsource the contract yourself

Quotation Order Generator 3-step trial calculation

1. Enter the age of the house, the number of square meters and the current status of the distribution box
2. Check the items you want to update (waterways/electrical circuits/distribution boxes)
3. Obtain a preliminary valuation range as a reference for comparing prices with a master

You can first use the Quotation Generator (/tools/repair-quotation-generator) to make a trial calculation as a reference for transparent price comparisons when negotiating with plumbers or decoration turnkey contractors.

5 contract details that must be confirmed before starting construction

• Whether the work items and unit prices are listed on the quotation to avoid adding them later
• Is wall demolition and repair included in the quotation?
• Whether the payment method is in stages (starting payment, progress payment, completion payment)
• Is there a warranty period and scope
• Whether the period of water and electricity consumption will be affected during the construction period
• Whether the removal of old pipelines and old distribution boxes includes removal costs
• If the work item is changed midway, is there a clear agreement on the calculation method for additional costs?

Suggestions on living arrangements during construction

During the whole-house water and electricity renewal period, the home will usually be without normal water and electricity for a period of time. It is recommended to confirm the construction schedule with the master in advance and arrange alternatives during this period, such as temporarily sleeping out or staggering the peak water consumption period, to reduce the impact on daily life.

How to accept the update after updating

After completion, it is recommended to actually test whether each socket is energized normally, whether the water pressure is stable, whether the distribution box circuits are clearly marked for each room, and whether the walls removed during the construction process have been completely repaired. These are all items that should be carefully confirmed during acceptance.

Further reading: If you are planning to renovate an old house, you can refer to the "Introduction Guide to Renovating Old Houses in Taipei", "Essentials for Upgrading Power Distribution in Old Houses", or "Complete Guide to Home Water and Electricity Planning".

FAQ

Q1: Is it necessary to build walls when updating water and electricity in old apartments?

Depending on the direction of the pipeline, partial open pipe construction can reduce the scope of wall construction, but old pipelines buried in walls usually still require partial demolition and repair.

Q2: How long does it take to update the whole house’s water and electricity?

Depending on the number of square meters and the complexity of the project, it will take about 3-5 days for a small number of square meters, while it may take 1-2 weeks for a larger number of square meters or a comprehensive update.

Q3: As a tenant, can I ask the landlord to update the water and electricity in the whole house?

It is a major repair. It is recommended to coordinate with the landlord first and leave a written record. The actual rights and obligations are still determined by the lease contract and relevant regulations.

Q4: Is it safe to only replace the distribution box and not the water pipe?

Electrical safety issues can be solved first, but if the water pipes are obviously corroded or leaking repeatedly, it is recommended to arrange time for treatment to avoid subsequent damage. The aging speed of the two systems is not necessarily the same and needs to be evaluated separately.

Q5: When updating water and electricity in an old apartment, can only some rooms be renovated?

It can be carried out in stages according to the budget, giving priority to the areas with the most frequent water leaks or power outages. However, it is recommended to ask the master to assess the overall direction of the pipeline first to avoid the problem of unsmooth connection with other sections after partial construction.

Common schedule planning for phased updates

If the budget is limited, many homeowners will choose to deal with the distribution box and the most commonly used bathroom and kitchen water lines first, and then update the pipelines in other rooms year by year. This phased approach can share the pressure of one-time expenditures, but it is recommended that the same master or the same team be hired to continue the construction at each stage to ensure the consistency of pipeline planning and avoid poor docking between different work shifts.

Common hidden costs of old house renovation

When demolishing walls in old apartments for construction, unexpected pipeline problems are often discovered. For example, old abandoned pipelines are still buried in the walls, or the floor structure is more difficult to construct than expected. It is recommended that these hidden costs be discussed with the master before the contract is signed to avoid significant budget overruns during the construction.

Dividing responsibilities between public pipelines and private pipelines

Water and electricity problems in old apartments sometimes involve public pipelines (such as drainage risers shared by the building). This part is usually the scope of joint maintenance by the management committee or all residents, and is different from the responsibility of updating their own indoor pipelines. If you find that the source of water leakage may come from public pipelines, it is recommended to ask a master to help you judge, and then decide whether to handle it yourself or report it to the management committee to coordinate public repairs.

Updated long-term maintenance recommendations

After the water and electricity system is updated, it does not mean that it will no longer need maintenance. It is recommended to arrange a simple inspection every one to two years, especially the load condition of the distribution box circuit and whether there are signs of leakage in the water pipe joints. Early detection of small problems can avoid the need for large-scale repairs in the future and extend the service life of the overall system.

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.