In the United States, “refelting a roof” usually means replacing the roofing underlayment beneath shingles or another roof covering. The felt itself is relatively inexpensive, but reaching it generally requires removing and reinstalling at least some of the roof covering. As a result, the total cost depends more on roof access, tear-off, repairs, and replacement materials than on the felt alone. A limited repair may cost a few hundred dollars, while work that requires stripping and reroofing an entire house can cost several thousand dollars or more.
Typical Roof Refelting Costs
For a U.S. home, a useful planning range for replacing underlayment as part of a larger roofing job is about $1.50 to $4.00 per square foot of roof area for underlayment-related labor and materials, before the cost of new shingles or other roof covering. This is a broad estimate, not a standard industry price: contractors may include underlayment in a complete roof-replacement bid rather than price it separately.
If the existing roof covering must be removed and replaced, the full project may cost roughly $5 to $12 or more per square foot for common asphalt-shingle roofs. Complex roofs, premium materials, difficult access, and extensive deck repairs can push the total higher. Local labor rates and roofing codes also matter.
“Per square” has a specific roofing meaning: one roofing square equals 100 square feet of roof surface. It does not mean 100 square feet of house floor space. A contractor measures the roof itself, including slopes and overhangs, to estimate the job.
| Scope of work | Broad U.S. planning range | What may be included |
|---|---|---|
| Underlayment on an exposed roof during reroofing | $1.50–$4.00 per roof sq. ft. | Underlayment, installation labor, and ordinary preparation; confirm what the quote includes |
| Complete asphalt-shingle replacement | $5–$12+ per roof sq. ft. | Removal, underlayment, shingles, installation, and disposal, depending on the bid |
| Localized leak repair | Often several hundred dollars or more | Small-area shingle removal, patching, flashing work, and replacement materials |
These ranges are for early budgeting, not a guaranteed quote. Prices vary by market and project conditions. A written estimate should state the measured roof area, material type, tear-off plan, disposal, flashing work, and whether damaged roof decking is included or billed separately.
What “Refelting a Roof” Means in the U.S.
In some countries, “roof felt” commonly describes the waterproof layer installed beneath roof tiles or other coverings. In the U.S., contractors more often use terms such as roofing underlayment, felt paper, or synthetic underlayment. The layer sits over the roof deck and below the shingles, metal panels, or other roof covering.
Underlayment provides a secondary water-shedding layer. It can help protect the roof deck during installation and when water gets beneath the outer covering, but it is not a substitute for sound shingles, properly installed flashing, or a roof designed for the local climate. Some areas also require specific underlayment products or installation details under building codes.
Because the underlayment is hidden, replacing it usually means lifting or removing the roofing material above it. For an asphalt-shingle roof, a contractor may need to remove a section of shingles, replace the underlayment, and install replacement shingles. If the underlayment is deteriorated across the whole roof, a full reroof is often more practical than trying to refelt isolated areas.
What Affects the Cost to Refelt a Roof?
Roof size, shape, and slope
A larger roof needs more underlayment and labor. Roof shape matters too: hips, valleys, dormers, skylights, chimneys, and multiple roof levels require additional cutting, fitting, and flashing work. Steep slopes can require extra fall protection and take longer to work on, increasing labor costs.
Removing and replacing the roof covering
Access is often the largest cost driver. Underlayment cannot normally be replaced from inside the attic or laid over the top of an existing shingle roof as a proper substitute. If shingles or panels must come off, the estimate may include tear-off labor, disposal fees, new roofing material, and installation. Some projects require removal of multiple existing layers, which adds time and weight-handling costs.
Underlayment material
Traditional asphalt-saturated felt is generally less expensive than many synthetic products. Synthetic underlayment often costs more per roll but may be lighter and more resistant to tearing during installation. Self-adhered membranes, commonly used in vulnerable areas such as eaves or valleys, typically cost more than standard felt. Product choice should fit the roof covering, climate, slope, and code requirements.
Material labels can be confusing. “15-pound” and “30-pound” felt are familiar trade terms, but modern products may instead be identified by performance specifications and manufacturer ratings. The contractor should identify the exact product in the proposal rather than relying only on a generic description.
Roof deck and water damage
Once the covering comes off, a roofer may find rotted, delaminated, or otherwise damaged sheathing. Replacing roof decking is usually an additional charge, often priced per sheet or by the affected area. The estimate should explain the unit price for deck replacement and how the homeowner will approve unexpected work before it proceeds.
Flashing, ventilation, and code requirements
Refelting may reveal failed step flashing, damaged pipe boots, or poor valley details. Replacing these components can add cost but may be necessary to address the source of a leak. Local building codes may also require specific underlayment, fastening patterns, ventilation, or ice-barrier details. Requirements differ by location, so a contractor should verify applicable rules before work begins.
Location, access, and season
Labor and disposal prices vary across the country. Urban access restrictions, limited parking, long material-carry distances, and difficult dumpster placement may raise costs. Weather can affect scheduling and the safe handling of exposed roof sections. A contractor may need to protect the roof temporarily if rain is expected during the work.
Roof Refelting Cost Examples
The following examples show how estimates can scale. They use broad ranges and assume the roof area is measured rather than inferred from the home’s interior square footage. Actual bids can differ significantly, particularly when roof covering, steepness, or repairs are involved.
| Roof area | Underlayment-related work at $1.50–$4.00 per sq. ft. | Full asphalt reroof at $5–$12 per sq. ft. |
|---|---|---|
| 1,000 sq. ft. | $1,500–$4,000 | $5,000–$12,000 |
| 1,500 sq. ft. | $2,250–$6,000 | $7,500–$18,000 |
| 2,000 sq. ft. | $3,000–$8,000 | $10,000–$24,000 |
These figures are budgeting illustrations, not stand-alone quotes. The lower “underlayment-related” estimate may not apply when a contractor must remove and reinstall substantial roofing material. For a small leak repair, a contractor may charge a minimum service fee rather than a price proportional to the few square feet of underlayment involved.
Repair, Partial Refelting, or Full Reroof?
A small repair can make sense when damage is localized and the surrounding shingles, flashing, and roof deck remain in good condition. The roofer may remove a limited area, replace damaged underlayment, and reinstall matching materials. However, a patch can be difficult to blend on an older roof, and nearby shingles may break when lifted.
Partial replacement may be appropriate when damage is concentrated on one slope or section. The contractor should explain how the new work will connect to the existing underlayment and how water will be directed across that transition. Improperly overlapped layers can create a path for leaks.
A full reroof is often the more durable option when the roof covering is near the end of its service life, underlayment failure is widespread, or repeated repairs have not stopped leaks. Replacing the covering and underlayment together also lets the contractor inspect the roof deck and renew vulnerable flashing. A professional inspection can help distinguish a failed underlayment from a leak caused by flashing, damaged shingles, condensation, or another issue.
Signs the Underlayment May Need Attention
Underlayment is hidden, so symptoms do not prove that it has failed. Water stains on ceilings or attic framing, recurring leaks after storms, damp roof decking, or visible deterioration during roofing work may justify an inspection. A leak can also originate at a chimney, vent, skylight, valley, or damaged shingle rather than beneath the entire roof.
Promptly addressing active water intrusion can limit damage to insulation, framing, and interior finishes. Homeowners should avoid climbing onto a wet or steep roof. A qualified roofer can inspect it safely and identify whether a targeted repair or broader replacement is warranted.
How to Compare Roofing Estimates
At least two or three written estimates can help reveal differences in scope, but the lowest price is not necessarily the best value. A clear estimate should describe the work in specific terms and identify the products to be installed.
- Confirm the measurement: Ask for the roof area, number of roofing squares, and any material-waste allowance.
- Identify the underlayment: Request the manufacturer, product name, and whether the proposal uses felt, synthetic material, or a self-adhered membrane.
- Clarify removal: Check whether existing shingles or panels will be removed, how many layers are included, and how debris will be disposed of.
- Review roof details: Ask whether valleys, eaves, flashing, pipe boots, and other penetrations are included.
- Set a deck-repair process: Confirm the price for damaged sheathing and how the contractor will document and approve extra work.
- Check protections: Verify licensing and insurance requirements for the location, warranty terms, cleanup, and protection of landscaping and property.
Homeowners can also ask whether the contractor will obtain permits when required and provide proof of insurance. Contract terms, warranties, and consumer-protection rules vary by state and municipality, so local requirements should be checked.
Can Homeowners Replace Roof Felt Themselves?
Replacing underlayment generally involves working at height and removing roof covering, so it carries fall and water-damage risks. A poorly sealed transition, incorrect overlap, or damaged shingle can create a new leak. Some manufacturers also require installation according to detailed instructions for their product warranties to apply.
A homeowner with appropriate experience may handle limited work on a low-slope, safely accessible structure, but a house roof is often best left to a qualified roofing contractor. Before any project, local permit rules, product instructions, and safety requirements should be reviewed. The cost of professional installation may be lower than the cost of correcting an unsafe or leaking repair.
Ways to Keep Refelting Costs Under Control
Early inspection can help identify a localized problem before water damages roof decking or interior finishes. Keeping gutters clear and arranging prompt repairs to damaged shingles or flashing may also reduce the chance of a small defect becoming a larger project.
For planned work, compare bids with the same scope and material specification. Ask whether a repair can reasonably extend the roof’s life, but be cautious if a contractor promises that a small patch will solve widespread deterioration. If a full reroof is needed, scheduling flexibility may help, though weather and contractor availability should take priority over an unusually low seasonal offer.
Reliable reference points include the U.S. Department of Energy’s information on roofing and cool roofs for roof-system considerations and local building departments for code requirements. Product installation instructions and manufacturer technical data are the best sources for confirming underlayment specifications. For a precise answer to “how much does it cost to refelt a roof,” a local inspection and a detailed written estimate are essential.