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Replacing plumbing in an old house is often necessary to prevent leaks, water damage, and other issues that can arise from aging or corroded pipes. In this blog, we’ll explore the factors that influence the cost to replace plumbing in an old house, and provide you with the latest data from the Bellevue, Redmond, Sammamish region to help you make informed decisions. Additionally, we’ll explain why Green House Plumbing and Heating is your go-to plumbing contractor for all your plumbing replacement needs.


  1. Factors Influencing the Cost to Replace Plumbing in an Old House: Several factors can affect the cost to replace plumbing in an old house, including:
    1. Size and layout of the house: Larger homes with more complex layouts typically require more materials and labor, resulting in higher costs.
    2. Type of plumbing materials: Common plumbing materials include PEX, PVC, and copper pipes, each with varying costs and benefits.
    3. Accessibility of the plumbing system: In older homes, accessing the plumbing system may be more challenging and time-consuming, increasing labor costs.
    4. Local labor rates and regional price variations: Labor costs can vary depending on your location and the specific plumbing contractor you choose.


  1. Average Cost to Replace Plumbing in an Old House: The average cost to replace plumbing in an old house typically ranges from $4,000 to $20,000, depending on the factors listed above. In the Bellevue, Redmond, Sammamish region, you can expect to pay around $10,000 to $15,000 for a complete plumbing replacement in a 2,000-square-foot house.


  1. Cost Breakdown for Replacing Plumbing in an Old House: Here is a breakdown of the costs involved in replacing plumbing in an old house:


  1. Materials: $2,000 to $10,000, depending on the type and amount of pipes needed
  2. Labor: $2,000 to $10,000, based on the complexity of the project and local labor rates
  3. Permits and inspections: $200 to $500


  1. Cost to Replace Plumbing Stack: The cost to replace a plumbing stack, which is the vertical pipe that connects your home’s plumbing system to the main sewer line, typically ranges from $1,500 to $5,000. This cost includes both materials and labor. In the Bellevue, Redmond, Sammamish region, the average cost to replace a plumbing stack is around $2,500 to $4,000.


  1. Factors to Consider When Replacing Plumbing in an Old House: When planning to replace plumbing in an old house, consider the following factors:


  1. Assess the condition of your current plumbing system to determine the extent of the replacement needed.
  2. Consult with a professional plumber to evaluate the best materials and methods for your specific situation.
  3. Obtain multiple quotes from different plumbing contractors to find the best value for your money.
  4. Schedule the plumbing work during a period when your home’s water usage will be minimal to reduce disruptions.


  1. Signs That You Need to Replace Plumbing in Your Old House: Indications that you may need to replace plumbing in your old house include:
    1. Frequent leaks or water damage: Older homes are more prone to leaks and water damage due to aging and corroded pipes. According to the Environmental Protection Agency, household leaks can waste nearly 10,000 gallons of water per year, which can lead to higher water bills and costly structural damage.
    2. Persistent low water pressure: Low water pressure throughout your home can be an indication of corroded or blocked pipes. A survey by the American Water Works Association found that, on average, 22% of water pipes in homes built before 1970 were in poor condition, which can contribute to low water pressure and reduced efficiency of your plumbing system.
    3. Discolored or foul-smelling water: If you notice discolored or foul-smelling water coming from your faucets, it could be a sign of corroded pipes or other issues within your plumbing system. The EPA estimates that about 15% of Americans receive water from private wells, many of which are in older homes, and these wells can be affected by contaminants such as iron, manganese, and hydrogen sulfide, leading to discolored and foul-smelling water.
    4. Visible corrosion on pipes or fixtures: Visible corrosion on your pipes or plumbing fixtures can be a clear indication that your plumbing system is deteriorating. In a study published in the Journal of the American Water Works Association, it was estimated that approximately 44% of the nation’s water infrastructure is in poor condition, with older homes being particularly vulnerable to corrosion and other plumbing issues.
    5. An aging plumbing system (typically 50+ years old): The lifespan of a plumbing system varies depending on the materials used. Galvanized steel pipes, which were commonly used in homes built before the 1960s, have a lifespan of about 20-50 years. Copper pipes can last up to 50-70 years, and PEX or PVC pipes can last around 40-50 years. According to the American Society of Civil Engineers, approximately 30% of the nation’s water infrastructure is 40-80 years old, highlighting the need for timely replacement in older homes.
    6. Frequent repairs: If you find yourself frequently calling a plumber to fix various issues with your plumbing system, it may be more cost-effective to invest in a complete replumbing rather than continually paying for repairs.

If you observe any of these signs in your old house, it’s essential to consult with a professional plumber to assess your plumbing system and determine whether a full replacement is necessary. Green House Plumbing and Heating can provide expert guidance and services to help you make the best decision for your home, preserving its historical charm while ensuring modern functionality and safety.

Frequently Asked Questions (FAQs)

Q: How long does it take to replace plumbing in an old house?

A: The time it takes to replace plumbing in an old house depends on the size and complexity of the plumbing system. For an average-sized home, it can take anywhere from a few days to a couple of weeks.

Q: Can I replace plumbing in my old house without damaging walls or floors?

A: In some cases, plumbers can replace pipes using trenchless pipe replacement methods or by running new pipes through existing pathways. However, there may be instances where some damage to walls or floors is unavoidable, especially in older homes with more challenging access to the plumbing system.


Q: Can I save money by doing some of the plumbing work myself?

A: While it might be tempting to save money by doing some plumbing work yourself, it’s generally best to leave plumbing replacement to licensed professionals. Doing so ensures the work is done correctly and safely, and that it complies with local building codes. Additionally, professional plumbers are more experienced in working with older homes and can minimize potential damage to walls and floors.


Q: Should I replace all the plumbing in my old house at once, or can I do it in stages?

A: While it may be more cost-effective to replace all the plumbing in your old house at once, you can also choose to do it in stages. However, keep in mind that doing so may require multiple permits and inspections, which can increase overall costs. Consult with a professional plumber to determine the best approach for your specific situation.


Q: What is the difference between repiping and replumbing?

A: Repiping refers to replacing only the pipes in your plumbing system, while replumbing involves replacing the entire plumbing system, including pipes, fixtures, and appliances. Repiping is often more affordable than replumbing but may not address all the issues in your plumbing system, especially if fixtures or appliances are also outdated or malfunctioning.


The cost to replace plumbing in an old house can vary depending on several factors, including the size of the house, the materials used, and local labor rates. By understanding these factors and working with a reliable plumbing contractor like Green House Plumbing and Heating, you can ensure a smooth and successful plumbing replacement project. Contact us today for a customized quote and let us help you bring new life to your old house’s plumbing system.



Table 1: Average Cost to Replace Plumbing in an Old House (Bellevue, Redmond, Sammamish, Issaquah)

Size of House (Square Feet) Cost Range
1,000 – 1,500 $5,000 – $10,000
1,500 – 2,000 $10,000 – $15,000
2,000 – 2,500 $15,000 – $20,000
2,500 – 3,000 $20,000 – $25,000
3,000+ $25,000+


Table 2: Plumbing Material Lifespan

Material Lifespan (Years)
Galvanized Steel 20 – 50
Copper 50 – 70
PEX 40 – 50
PVC 40 – 50


Table 3: Cost Breakdown for Replacing Plumbing in an Old House

Cost Component Cost Range
Materials $2,000 – $10,000
Labor $2,000 – $10,000
Permits & Inspections $200 – $500


Table 4: Cost to Replace Plumbing Stack

Location (City) Average Cost Range
Bellevue, Sammamish, Issaquah $2,500 – $4,000


Table 5: Signs You Need to Replace Plumbing in an Old House

Sign Indicator of
Frequent leaks or water damage Aging and corroded pipes
Persistent low water pressure Corroded or blocked pipes
Discolored or foul-smelling water Contaminated or corroded pipes
Visible corrosion on pipes or fixtures Deteriorating plumbing system
Aging plumbing system (50+ years old) Outdated materials and potential plumbing issues


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