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A gable roof has two sloping planes meeting at a ridge with a vertical triangular wall at each end; a hip roof slopes on all four sides with no end walls. Gables are cheaper to frame and to re-roof, typically by 10 to 20%, because rafters repeat and shingle courses run straight across, and they give far more usable attic headroom. Hip roofs resist wind better — there is no large vertical gable for wind to push against, which is why wind mitigation programmes in hurricane states often recognise hip geometry — but every course meeting a hip is cut at an angle, waste factors run 12 to 15% instead of about 10%, and four hip lines need cap shingles instead of one ridge. This guide compares both shapes on cost, framing, ventilation, snow shedding and leak-prone details, and explains why changing shape on an existing house is a framing project rather than a roofing one.
Both are ordinary residential roof shapes, they cover the same footprint with the same surface area at the same pitch, and they behave quite differently in wind, in material waste and in how they can be ventilated.
| Gable | Hip | |
|---|---|---|
| Planes | Two | Four |
| Surface area for the same footprint and pitch | Same | Same |
| Typical waste factor | 10% | 15% |
| Cap needed | Ridge only | Ridge plus four hips |
| Rake drip edge and starter | Yes, on both rakes | None — there are no rakes |
| Wind performance | Good; the gable wall catches wind | Excellent |
| Ridge length for venting | Longest for the footprint | Much shorter |
| Attic space | More usable | Less, sloping in on all sides |
| Build cost | Lower | Higher — more planes, more cuts |
| Footprint | Roof area | Gable bundles | Hip bundles |
|---|---|---|---|
| 1,000 sq ft | 1,118 sq ft | 37 | 39 |
| 1,500 sq ft | 1,677 sq ft | 56 | 58 |
| 2,000 sq ft | 2,236 sq ft | 74 | 78 |
| 2,500 sq ft | 2,795 sq ft | 93 | 97 |
| 3,000 sq ft | 3,354 sq ft | 111 | 116 |
The difference is the waste factor, not the area. A hip roof has eight diagonal cut lines against a gable's four straight rakes, and a diagonal cut leaves offcuts that fit nowhere.
Short answer: For the same footprint and pitch a gable and a hip roof have the same surface area. The hip costs more to re-roof because diagonal cuts push waste from about 10% to 15% and it needs cap shingles on four hips as well as the ridge — on 2,000 sq ft that is 69 bundles instead of 66.
| Roof area | Gable bundles | Hip bundles | Extra for the hip |
|---|---|---|---|
| 1,500 sq ft | 50 | 52 | 2 bundles (150 lb) |
| 2,000 sq ft | 66 | 69 | 3 bundles (225 lb) |
| 2,500 sq ft | 83 | 87 | 4 bundles (300 lb) |
| 3,000 sq ft | 99 | 104 | 5 bundles (375 lb) |
Bundle weights use 75 lb per architectural bundle. Hip and ridge cap are counted separately — measure the four hips plus the ridge in linear feet and use the ridge cap calculator. Labour is the bigger difference: every course on a hip ends in an angled cut.
Related: Hip roof calculator · Gable roof calculator · Ridge cap calculator
Where wind-mitigation credits exist, roof shape is one of the boxes the inspector ticks. Florida’s Uniform Mitigation Verification Inspection Form (OIR-B1-1802) has three roof-geometry answers:
Porch and carport roofs attached only to the fascia or wall over open space are left out of the measurement. A house with a hip main roof and one small gable dormer can still qualify as hip if the gable features stay under 10% of the perimeter.
Source: Florida Office of Insurance Regulation, form OIR-B1-1802, question 5 (Roof Geometry).
A gable roof has two sloping planes meeting at a ridge, leaving a vertical triangular wall (the gable) at each end. A hip roof slopes on all four sides, so there are no vertical end walls and the planes meet along diagonal hip lines.
Yes. A hip roof typically costs more to frame and to re-roof because every course is cut at an angle, there are four hip lines needing cap shingles, and waste runs about 15% against 10% on a simple gable — 69 bundles instead of 66 on 2,000 sq ft.
In wind-mitigation programmes, roof shape is scored. Florida’s OIR-B1-1802 form counts a roof as hip when non-hip shapes make up no more than 10% of the total roof system perimeter; a gable roof is recorded as “other roof”. Ask your insurer what credit applies.
Hip roofs generally perform better in high wind and hurricane conditions. The four sloped planes shed wind loads more evenly and there is no large flat gable wall for wind to push against, which is why hip roofs often qualify for wind-mitigation insurance credits in coastal states.
Gable. Because the end walls are vertical, headroom continues right to the end of the attic, making conversions and storage easier. A hip roof’s slope on all four sides cuts usable volume noticeably.
Gable roofs are simpler — gable end vents plus soffit and ridge vents give plenty of options. Hip roofs have a shorter ridge and no gable walls, so they rely on soffit intake with ridge or hip vents, and low-slope hips sometimes need powered or additional venting.
Structurally it is possible, but it is a framing job rather than a roofing job: the end walls change load path, new hip rafters and jack rafters are required, and ventilation must be reworked. It needs a structural engineer or an experienced framer and permits in most jurisdictions.