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What a front, back or wrap-around porch costs to build.
With these inputs:
| Result | Value |
|---|---|
| Contractor-installed porch | $7,888 – $15,016 |
| Porch area | 128 sq ft |
| Per square foot | $62 – $117 |
| Roof | Gable |
| Floor structure and decking | $2,048 – $3,328 |
| Roof framing and covering | $4,096 – $7,040 |
| Ceiling | $1,024 – $2,048 |
| Columns (4) | $720 – $2,600 |
| Footings | Included in the floor structure |
The roof is what separates a porch from a deck, and it is usually 40 to 55% of the total — it needs its own footings, posts sized for the load, proper flashing where it meets the house, and in most places a permit and an inspection. Ranges here are national and swing widely by region and by how the roof ties into the existing roofline. Get at least three itemised quotes before committing.
A porch is a deck with a roof, and the roof is most of the difference in price. This estimates the deck structure, the roof, the ceiling and the columns separately so you can see where the money goes.
Far more than the same sized deck, because of the roof. A covered porch typically runs two to three times the cost per square foot of an open deck, since the roof needs its own structure, footings sized for the extra load, flashing into the existing roof, and usually a ceiling. The floor itself is the cheap part.
No. An open deck of the same size is substantially cheaper because there is no roof, no columns carrying roof load, no ceiling and much simpler permitting. If budget is the constraint, building the deck now and adding the roof later is a common approach — but size the footings and posts for the roof from the start, or you will rebuild them.
Almost always, and more reliably than for an open deck. A roof structure attached to the house changes the building's footprint and its load paths, so most jurisdictions require drawings and at least a footing inspection and a final. Roof-to-wall flashing is one of the most common inspection failures.
A shed roof — a single slope away from the house. It uses the least material, frames fastest and flashes most simply. A gable roof costs noticeably more and a hip roof more again, because every additional slope adds cuts, waste and labour.
Sometimes, but check the footings and posts first. A roof adds dead load and, in snow country, a large live load that the original deck was never designed for. An engineer or building official can tell you whether the existing structure can carry it; often the answer is that the footings need enlarging, which means working under a finished deck.
Need the whole roof at once? The free roofing calculator works out roof area, squares, shingle bundles, underlayment, drip edge, ridge cap and installed cost from one set of measurements.