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Question DetailsAsked on 7/8/2016

cost to build a 30x14 wood awning

i want an attached roof to cover my deck along my house. 30x14

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1 Answer


I would not use the term "awning" with contractors - to most that would mean a fiberglass or fabric overhanging cover like over hotel and apartment building entrances and outdoor restaurants and such. Sounds like you are talking a shed roof or porch roof extension. Commonly not less than about $20/SF for normal light or no snow load / non-hurricane areas, and more commonly about $25-40/SF in most areas - assuming this deck is not more than about 5 feet off the ground. Up to the higher end of that range and up to about $45-60/SF for significant hurricane or snow load rated, and rarely above $50/SF for fancy support columns, fully finished/insulated and recess lighted underside and such.

Below are links to some related previous similar questions FYI -

Important thing to consider - the interface between existing roof and new is a very common leak point - so either the new roof segment should be fully married into the old roof (meaning a bit of the old roof has to be taken off to overlap water barrier and shingles and such) and should definitely get ice and water shield along the interface.

Or the new roof should sit significantly below the old roof fascia and tucked in under it to catch the water falling and missing the existing roof, like a cascade. Leave room for cleaning the tuck-under extension part - but this arrangement, with the step-down, allows for leaving gutters on the existing roof to catch the water from that part, with new gutters catching the new roof runoff - except in heavy snow or icing country where the upper gutter will block up with snow and ice up solid in this arrangement. This is commonly not a workable solution unless the existing roof is high (like maybe second story roof over a ground level deck) because of headroom issues at the outer end, unless your existing roof clearance over porch is high.

In snow country - the shed roof should not have a flatter slope than the house and is better if steeper, and consideration has to be given to the likelihood of icing on the shed roof if the underside is unheated (i.e. not an enclosed heated porch). Major icing and glaciering of shed roofs like this, commonly leading to backup to and water damage at the edge of the house, is very common in snow country.

Another solution rarely done except in "modernistic" design houses because it looks a bit hokey, but works and is used where the existing roof eave is say 7-8 feet above the porch so by the time a normal slope gets to the outer edge of the porch it is too low for comfort, is building the shed roof upper edge ABOVE and clear of the existing roof for more elevation, or tying it into the existing roof uphill of the eaves, though that basically means a flatter slope than above - like this (second image):

Other solutions are to make the shed roof of a snow-shedding material (commonly metal roofing, with heat tape UNDER the front edge as necessary to prevent the snow from icing up and getting stuck at the downhill edge, in which case you can sometimes get away with a flatter roof.

Sloping the roof to the sides as a front gabled roof like in photos 1 and 3 above also works - flat roofs like the last one should be avoided if possible, especially in icing/snow country. at least try to give it enough slope to drain if you decide to use a "flat" roof.

Google this search phrase for tons of photos of porch roof types - images of porch roofs

Your normal starting point would be an Architect, or at a minimum for structural design only a Structural Engineer, to develop the plans and specs that will be needed to get a building permit, and also for contractors to bid and eventually build to.

Decks and Porches and Remodeling - General Contractors would be your usual Search the List categories for this type of work.


Answered 4 years ago by LCD

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