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Question DetailsAsked on 3/14/2016

How much would it cost to increase the size of already existing window frame?

The current window is around 21" and I would like to increase it to a more standard size, like 36", along with a new window to fit the frame.

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1 Answer


Depends on specifics of the house and what loads are coming down above that point - can runn from about $150-250 in the easy case to as much as $1000 or more than just the new window/install cost depending on circumstances. Concrete or steel or brick framed houses also can cost much more than a wood framed on, particularly if you want ot put the window openings where there is a supporting member - that can run thousands in non-wood framing.

Also depends on whether you do it the legal way or not - widening an opening involves structural modification to the wall, which in almost all code jurisdictions requires a structural engineer design of the new supporting beam and studs, which costs $250-400 typically - plus building permit, plus the above cost for the actual modifications.

If you avoid the legalese most window installers will cut into the wall and put in a wider header and studs (sometimes even correctly).

The actual window and install, not including the opening modification, likely to run in the $600-1500 range for say 36x48 or 36x60 window, depending on energy efficiency, whether they waterproof and flash out the opening correctly, and on type of siding you have. THis is certainly something you want to get several bids for.

Answered 4 years ago by LCD

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