Repiping a house is a significant but necessary investment that ensures a safe, efficient, and leak-free plumbing system. Over time, old pipes corrode, crack, and clog, leading to low water pressure, leaks, discoloured water, and costly repairs. If you’re experiencing these issues or planning a renovation, it’s crucial to understand How much does repiping a house cost to budget accordingly.
The cost to repipe a house depends on factors like home size, pipe material, labor charges, and permit fees, especially in Oahu, Hawaii, where plumbing costs tend to be higher than on the mainland. Choosing between PEX and copper pipes, understanding installation timelines, and considering additional expenses like drywall repairs can significantly impact your overall costs.
This guide provides an updated 2025 cost breakdown, helping you make an informed decision on whole house repiping. Read on to explore repiping costs, timelines, and factors affecting pricing in Oahu.
How much does repiping a house cost?
The cost of repiping a house in 2025 varies based on home size, pipe material, and labour charges. In Oahu, Hawaii, repiping costs are generally higher due to increased labour and material expenses compared to the mainland.
| House Size (sq. ft.) | Type | PEX Repiping Cost | Copper Repiping Cost | Total Estimated Cost (Including Labor & Permits) |
| 1,000 – 1,500 sq. ft. | Small Home | $4,000 – $7,000 | $5,200 – $10,400 | $5,500 – $11,000 |
| 1,500 – 2,000 sq. ft. | Medium Home | $1,500 – $4,000, | $8,000 – $16,000 | $7,500 – $17,500 |
| 2,000 – 3,000 sq. ft. | Large Home | $3,000 – $15,000+ | $8,000 – $15,000 | $9,500 – $17,500 |
| 3,000+ sq. ft. | Luxury Home | $8,000 – $15,000 | $8,000 – $20,000 | $12,000 – $27,000 |
1,000 – 1,500 sq. ft.
Homes in this size range typically include small single-family houses, condos, or one-story properties with one to two bathrooms. Since these homes have simpler plumbing systems, the cost to repipe remains on the lower end due to fewer pipes, reduced labor, and minimal structural modifications. Homeowners can expect faster installation, often completed within 2 to 3 days, making it a cost-effective and efficient repiping project.
Most homes in this category use PEX pipes, which are flexible and easy to install, further reducing costs. However, if opting for copper, expenses may increase by 30-50%. Since smaller homes require fewer materials, homeowners can often save on labor and permit costs. Despite the smaller scale, proper planning is essential to avoid unnecessary delays or extra expenses.
1,500 – 2,000 sq. ft.
This category represents mid-sized single-family homes with two to three bathrooms and a more complex plumbing system. These homes often have multiple plumbing fixtures, longer pipe runs, and additional water connections that contribute to higher material and labor costs. The cost of repiping a house in Oahu within this size range is moderate but depends on whether the home uses PEX or copper piping.
PEX pipes remain a budget-friendly choice, while copper piping increases costs due to higher material and installation expenses. The installation process generally takes 3 to 5 days, depending on accessibility and the number of fixtures. Homes in this category may require more drywall removal and repairs, which add to the overall cost. Homeowners should ensure their plumbing contractor considers permit costs, inspection fees, and structural modifications to provide an accurate estimate.
2,000 – 3,000 sq. ft.
Larger homes in this range often have multiple floors, multiple bathrooms, and complex plumbing layouts that require extensive repiping. These homes usually have three to five bathrooms, larger kitchens, laundry rooms, and additional water fixtures, increasing the demand for more piping, labor, and time. The cost of repiping a house of this size in Oahu is significantly higher, especially if copper pipes are used, due to increased material expenses and labour-intensive installation.
Repiping a 2,000 – 3,000 sq. ft. home can take anywhere from 5 to 7 days, with additional time needed for drywall repairs, flooring adjustments, or inspections. Since these homes often have extensive plumbing networks, repiping may require structural modifications, increasing overall expenses. It is essential to get detailed cost estimates from experienced plumbers and consider factors like permits, accessibility, and the complexity of the existing plumbing system.
3,000+ sq. ft.
Homes exceeding 3,000 sq. ft. fall into the category of luxury estates, multi-story residences, and multi-unit properties, often featuring multiple bathrooms, kitchens, and extensive plumbing systems. These homes require a highly labor-intensive repiping process due to their large layouts, longer pipe runs, and complex plumbing connections.
The cost of repiping a large house in Oahu is the highest due to increased material usage, labor requirements, and potential structural adjustments. Homes of this size typically require detailed planning, and the installation can take 7+ days. Permit approvals, inspections, and restoration work may further extend the timeline. Homeowners should budget for additional expenses, including wall and flooring repairs, advanced plumbing configurations, and upgraded fixtures, ensuring their new plumbing system is efficient, durable, and built to last for decades.
Signs Your Whole House Needs Repiping
If you are unsure that your home needs repiping, here are the most common warning signs indicating your plumbing system may require a complete overhaul. Addressing these issues early on can prevent costly water damage, frequent repairs, and high utility bills.
Low Water Pressure
Low water pressure is one of the earliest signs of aging pipes. How much does repiping a house cost? Over time, mineral deposits, rust, and sediment buildup inside your pipes can cause blockages, restricting the normal water flow. If you notice weak water pressure throughout the house, especially in multiple fixture,s it’s a sign that your plumbing system is deteriorating.
Common Causes of Low Water Pressure Due to Failing Pipes:
- Corroded pipes (especially in homes with older galvanized steel or copper pipes).
- Leaks within the plumbing system reduce pressure before reaching faucets.
- Clogged pipes due to limescale and mineral buildup, common in homes with hard water.
If your home’s water pressure has gradually decreased over time, repiping may be the best solution to restore strong, consistent flow.
Discolored or Rusty Water
Rusty or discolored water is a major red flag that your pipes are corroding from the inside. When pipes start breaking down, small flakes of rust mix with the water, giving it an unpleasant color and taste.
Key Indicators Your Pipes Are Corroding:
- Rusty water only in hot water taps → Indicates your water heater’s pipes may be corroded.
- Discolored water in both hot and cold taps → Suggests aging pipes throughout your home.
- Brown or red-tinted water when turning on the faucet after a few hours of inactivity → A strong sign of internal pipe rusting.
Corroded pipes don’t just affect water color, they can also compromise water quality, leading to potential health concerns. If your water smells metallic or leaves reddish stains in sinks and toilets, it’s time to consider repiping.
Frequent Leaks
A small leak may seem like a minor inconvenience, but frequent leaks indicate a deeper issue, your pipes are worn out and deteriorating. If left unaddressed, small leaks can escalate into major water damage, mold growth, and high repair costs.
Why Do Old Pipes Leak?
- Corrosion weakens pipe walls, making them prone to cracks and leaks.
- Shifting foundations or temperature changes cause pipes to expand and contract, leading to stress fractures.
- Pipe joints weaken over time, increasing the likelihood of leaks at connections.
If you find recurring leaks in different areas of your home, repiping may be more cost-effective than paying for multiple short-term repairs.
Strange Noises from Pipes
Unusual noises coming from your plumbing system are often caused by pressure issues, trapped air, or deteriorating pipes. Here’s what different sounds might indicate:
Banging or Knocking Sounds (“Water Hammer”)
- Occurs when water suddenly stops or changes direction, causing pipes to shake.
- Often due to loose pipes or pressure surges.
- Could mean your pipes are old and poorly secured.
Whistling or Screeching Sounds
- Caused by narrowed pipes due to mineral buildup or corrosion.
- Indicates blockages that restrict water flow.
Rattling or Vibrating Pipes
- Suggests loose pipe fittings that need reinforcement.
- Could mean your plumbing system is nearing the end of its lifespan.
If your pipes are getting noisier over time, it’s best to have a professional plumber inspect them. These sounds could be early warnings of an impending plumbing failure.
Water Temperature Fluctuations
If your home experiences random temperature fluctuations, your plumbing system is struggling to regulate water flow. This is especially common in older homes where pipes are:
- Too narrow or clogged, limiting the supply of hot and cold water.
- Corroded or leaking, causing an uneven distribution of water temperature.
- Connected to an outdated water heater, which cannot efficiently supply hot water.
Sudden shifts from scalding hot to cold water can be frustrating and dangerous. If you frequently adjust the temperature while showering or washing dishes, your aging plumbing system may be to blame.
How Long Does Repiping Normally Take?
The time required for whole house repiping depends on several factors, including home size, plumbing complexity, material choice, and labor availability. On average, repiping a house can take anywhere from 2 days to over a week.
General Time Estimates for Repiping
- Smaller homes (1,000 – 1,500 sq. ft.) → Typically takes 2 to 3 days.
- Medium-sized homes (1,500 – 2,500 sq. ft.) → May require 3 to 5 days to complete.
- Larger homes (2,500 – 3,000 sq. ft.) → Usually takes 5 to 7 days, depending on the number of bathrooms and plumbing layout.
- Very large homes (3,000+ sq. ft.) → Can take a week or more, especially if there are multiple stories and extensive piping systems.
Key Factors That Affect Repiping Time
- Pipe Material
- PEX pipes are quicker to install than copper due to their flexibility and ease of connection.
- Copper repiping takes longer because it requires precise cutting, soldering, and joint sealing.
- House Layout & Plumbing Complexity
- Homes with multiple stories or complicated plumbing routes (e.g., pipes behind walls or under concrete slabs) will require extra time.
- Older homes may need additional modifications, such as removing old pipes from difficult-to-reach areas.
- Number of Bathrooms & Fixtures
- The more bathrooms, sinks, showers, and appliances connected to the plumbing system, the longer the repiping process.
- Homes with only one or two bathrooms can typically be repiped much faster than homes with four or more.
- Permit & Inspection Requirements
- Permits and inspections are required before and after repiping.
- The approval process may add a few extra days to the timeline, depending on local regulations.
Additional Costs to Consider When Repiping a House
Repiping isn’t just about replacing pipes. Here are additional expenses to factor into your budget. Some plumbers offer discounts for combining repiping with other plumbing upgrades.
| Expense Type | Estimated Cost |
| Plumbing Permit | $200 – $500 |
| Drywall Removal & Repair | $1,000 – $3,500 |
| Water Damage Repair (if needed) | $500 – $5,000 |
| Upgrading to PEX Manifold System | $500 – $1,500 |
Final Words
So, How much does repiping a house cost? Repiping your house is a long-term investment in your home’s plumbing system, water quality, and overall structural integrity. If you are experiencing frequent leaks, low water pressure, discolored water, or fluctuating temperatures, it may be a strong indicator that your pipes are deteriorating and need replacement. Ignoring these issues can lead to costly water damage, mold growth, and high utility bills, making repiping a necessary upgrade rather than an avoidable expense.
Choosing the right repiping material, whether PEX or copper plays a crucial role in the longevity and efficiency of your new plumbing system. Additionally, repiping enhances home value, improves water flow, and ensures a healthier water supply for your household.
If your home’s plumbing system is over 30 years old, consulting a licensed plumber in Oahu for a repiping estimate is a smart step toward securing safe and efficient water distribution for years to come.