2026 project cost
Replace Roof Underlayment Cost
$1,374 to $2,024 for 1,000 sq ft, or about $1.37–$2.02 per sq ft. That covers 5 material line items and about 8 labor hours.
Estimate your replace roof underlayment project
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Estimated total
$1,374 – $2,024
materials + labor
What the materials cost
Quantities for 1,000 sq ft, including a 12% waste allowance.
| Material | Qty | Cost |
|---|---|---|
| 2-in x 10-ft Black Galvanized steel Drip Edge | 112.01 EA | $573 – $809 |
| Synthetic Roof Underlayment | 1120 SF | $202 – $392 |
| 2-in Smooth Shank Electro-galvanized Roofing Nails 3817 -Per Box | 1.13 BOX | $45 – $64 |
| Roofing Sealant | 2.25 TUBE | $18 – $34 |
| Single Bead Butyl Tape Sealant 50-Feet Roof Seam Tape | 1.13 EA | $6 – $8 |
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How long it takes
- 1
Remove Old Roofing Materials 4-6 hours
Carefully strip away shingles and existing underlayment from the roof in your area, disposing of debris according to local guidelines. Inspect decking for damage.
- 2
Inspect and Repair Roof Deck 2-3 hours
Examine the exposed roof deck for rot or damage. Replace or repair any compromised sections to ensure a solid base for new underlayment in your area.
- 3
Install New Underlayment 4-6 hours
Roll out and secure new underlayment across the roof surface, overlapping seams and fastening according to manufacturer instructions for your area weather conditions.
- 4
Reinstall Roofing Materials 6-8 hours
Install new shingles or roofing material over the underlayment, ensuring proper alignment and secure attachment to meet your area building codes.