Pipe Relining Cost per Foot

Per-Foot Cost by Pipe Diameter

Pipe diameter is the strongest predictor of relining cost per foot because larger pipes require more liner material and more resin to saturate the liner. The relationship is not perfectly linear, as the material volume increases with the square of the diameter.

3-inch pipe: $80 to $150 per foot. Found in some older homes as interior branch lines. Relining 3-inch pipe is less common because many contractors have minimum pipe size requirements, and the reduced interior diameter after lining may be a concern for already-small pipes.

4-inch pipe: $100 to $200 per foot. This is the most common residential sewer lateral size and the sweet spot for relining. Contractor availability is highest and per-foot costs are most competitive for 4-inch work.

6-inch pipe: $130 to $250 per foot. Many residential laterals transition to 6 inches at the point where the line exits the foundation. Relining 6-inch pipe uses roughly 50% more material than 4-inch, which accounts for much of the cost increase.

8-inch and larger: $175 to $350+ per foot. Pipes this size are uncommon in single-family residential applications but appear in some older homes, multi-family buildings, and commercial properties. Fewer residential contractors work at this diameter, limiting competition and pushing prices higher.

Per-Foot Cost by Lining Method

Several relining technologies exist, each with different per-foot costs and suitability for various pipe conditions.

CIPP (Cured-in-Place Pipe)

CIPP is the most widely used relining method for residential sewer lines. A flexible felt or fiberglass tube saturated with epoxy or polyester resin is inserted into the pipe, inflated to press against the pipe walls, and cured in place using UV light, hot water, or ambient temperature curing. The result is a seamless, jointless new pipe wall inside the existing pipe.

CIPP costs $100 to $250 per foot for residential work. UV-cured CIPP is faster (curing takes 1 to 3 hours) and slightly more expensive than ambient-cure products (which take 12 to 24 hours). The UV method allows same-day completion, which can offset the higher material cost through reduced labor hours.

Pull-in-Place Lining

Pull-in-place (PIP) lining is a variation of CIPP where the liner is pulled through the pipe from one access point to another rather than inverted with air or water pressure. PIP costs $90 to $200 per foot and works well for straight or nearly straight pipe runs. It requires access at both ends of the pipe, adding potential excavation costs if cleanouts are not available.

Spray Lining

Spray lining applies a thin coating of epoxy or polyurea directly to the interior pipe walls using a spinning spray head. It costs $50 to $120 per foot, making it the least expensive relining method per foot. However, spray lining creates a much thinner wall (typically 2 to 4 mm compared to 4 to 9 mm for CIPP), making it more suitable for pipes with minor corrosion or joint issues rather than pipes with significant structural damage. Spray lining is more common for drain and water supply pipes than for sewer laterals.

Factors That Move the Per-Foot Price

Pipe condition. Pipes that require extensive pre-lining preparation cost more per foot. Roots must be removed, scale and debris cleaned out, and protruding tap connections ground flush before the liner can be inserted. A pipe in relatively clean condition might need $300 to $800 in preparation, while a heavily root-invaded or scaled pipe could require $1,000 to $2,000 in cleaning and preparation before lining can begin.

Number of bends. Straight pipe runs are the least expensive to line because the liner feeds smoothly through the pipe. Each bend increases the difficulty of insertion and the risk of wrinkles or thin spots in the liner. Pipes with multiple bends may require shorter liner sections with multiple insertions, each adding setup costs.

Access point availability. If the existing pipe has an accessible cleanout, the liner can be inserted without any excavation, saving $500 to $1,500 that would otherwise be spent creating an access point. Two accessible points (one at each end) provide the most flexibility for insertion and allow pull-in-place methods.

Project length. Relining projects have fixed costs for equipment mobilization, setup, and post-cure inspection that are spread over the total footage. A 30-foot project pays the same mobilization cost as a 100-foot project, making shorter runs more expensive per foot. For projects under 30 feet, many contractors have minimum charges of $3,000 to $5,000 regardless of the actual footage.

Geographic location. Per-foot relining costs vary by 30% to 50% between regions. Coastal cities and high-cost metropolitan areas trend toward the top of the range, while rural and lower-cost regions trend toward the bottom. Contractor density also affects pricing, with more competition generally producing lower bids.

What the Per-Foot Price Includes (and What It Does Not)

A well-written relining quote should specify exactly what is included in the per-foot price. At minimum, the per-foot price should cover liner material, resin, insertion, inflation, and curing. Items that are sometimes included and sometimes billed separately include pipe cleaning and preparation, pre-lining camera inspection, post-lining camera inspection, branch reconnections, and access excavation if needed.

Ask the contractor to provide an all-inclusive project price rather than negotiating on per-foot rates. A contractor quoting $100 per foot with all preparation, inspection, and reconnection included is a better deal than one quoting $80 per foot when those items are billed separately and add $2,000 to the project.

Relining vs Full Replacement Cost Comparison

At $100 to $250 per foot, relining costs roughly the same as trenchless pipe bursting ($60 to $200 per foot) and more than traditional excavation pipe work alone ($50 to $150 per foot). The cost advantage of relining over traditional methods comes from the near-total elimination of excavation and restoration costs.

Relining is most cost-effective when the existing pipe is structurally sound but has joint leaks, minor cracks, or root intrusion. If the pipe has collapsed, has severe bellies, or has lost significant structural integrity, relining is not appropriate and pipe bursting or excavation should be used instead.