How Many Roofing Squares for a 1,800 Sq Ft House?
A 1,800 sq ft single-story house needs about 24.3 roofing squares (73 shingle bundles) at a 6/12 pitch with 12-inch overhangs and 10% waste. A new asphalt shingle roof costs roughly $8,506–$13,366. Steeper pitches and hip roofs need more – see the tables below.
Roof squares for a 1,800 sq ft house by pitch
Assumes a rectangular footprint about 50 × 36 ft (length = 1.4 × width) with 12-inch overhangs.
| Pitch | Multiplier | Roof area | Squares (gable, +10%) | Squares (hip, +15%) | Bundles (gable) |
|---|---|---|---|---|---|
| 4/12 | 1.054 | 2,083 sq ft | 22.9 | 24 | 69 |
| 6/12 | 1.118 | 2,209 sq ft | 24.3 | 25.4 | 73 |
| 8/12 | 1.202 | 2,375 sq ft | 26.1 | 27.3 | 79 |
| 10/12 | 1.302 | 2,572 sq ft | 28.3 | 29.6 | 85 |
Cost to replace the roof on a 1,800 sq ft house
| Roof type (6/12) | Squares | Asphalt shingles | Metal roofing |
|---|---|---|---|
| Gable | 24.3 | $8,506–$13,366 | $19,441–$34,022 |
| Hip | 25.4 | $8,892–$13,973 | $20,325–$35,569 |
Installed prices: asphalt $350–$550 per square, metal $800–$1400 per square. Tear-off of an old layer usually adds $100–$150 per square (about $2,430–$3,645 here).
Materials for a 1,800 sq ft roof (6/12)
- Shingles: 73 bundles for a gable roof, 77 for a hip roof.
- Underlayment: 3 rolls of synthetic underlayment (10 squares each) for gable, 3 for hip.
- Ridge cap: about 50 ft of ridge on a gable roof (2 bundles at ~25 ft each); a hip roof has about 122 ft of ridge and hips (5 bundles).
How it is calculated
(50 + 2) ft × (36 + 2) ft = 1,976 sq ft with overhangs
1,976 × √(1 + (6 ÷ 12)²) = 1,976 × 1.118 = 2,209 sq ft of roof
2,209 ÷ 100 × 1.1 = 24.3 squares (gable) · × 1.15 = 25.4 (hip)
24.3 squares × 3 = 73 bundles
Tips for a 1,800 sq ft house
- A roof this size is usually a one-day tear-off for a 4–5 person crew, and most dumpsters (20 yard) handle the 24 squares of old shingles.
- Two-story homes: a 1,800 sq ft two-story house has only about 900 sq ft of footprint, so its roof is closer to 12.6 squares (6/12 gable) – not 24.3. Measure the footprint, not the living area.
- Garages, porches and dormers add squares that are not counted in living area – measure them separately.
Frequently asked questions
How many squares is a 1,800 sq ft roof?
A 1,800 sq ft single-story house (about 50 × 36 ft) has roughly 24.3 roofing squares at 6/12 pitch with 12-inch overhangs and 10% waste. That ranges from 22.9 squares at 4/12 to 28.3 squares at 10/12. A hip roof at 6/12 needs about 25.4 squares.
How much does it cost to replace the roof on a 1,800 sq ft house?
At 6/12 pitch, an asphalt shingle roof on a 1,800 sq ft single-story home typically costs $8,506–$13,366 for a gable roof and $8,892–$13,973 for a hip roof. Metal roofing runs $19,441–$34,022 for a gable roof.
How many bundles of shingles for a 1,800 sq ft house?
Plan on 73 bundles (3 per square) for a 6/12 gable roof with 10% waste, or 77 bundles for a hip roof with 15% waste. Add about 2 bundles of ridge cap shingles for the ridge.