Sliding patio door. (Therma-Tru / July 21, 2014)

If your sliding patio door gets a rigorous workout, it may be ready for replacement. You'll be glad to know that manufacturers have improved the design and construction of these doors. You'll find a good selection, in various sizes and configurations, at window replacement companies, home centers and lumberyards. Many of these sellers also offer installation service.

When scheduling the replacement of a patio door, consider the weather, because when the old unit is removed, the opening is exposed to the elements. Also take the opportunity to consider if any repairs are needed to the siding, floor, deck or interior trim.

A contractor will charge $1,157 to replace an old 6-foot wide two-panel sliding door with a new one. That includes labor and material. If repair work or additional carpentry is required, the cost will be higher. If you have extensive carpentry experience and tools, you can remove the old slider, buy the new door for $765 and make the installation, saving 39 percent. If you have any doubts about tackling the job, don't attempt it! Call in a pro.

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Pro Cost -- DIY Cost -- Pro time -- DIY Time -- DIY Savings -- Percent Saved

$1,157 -- $765 -- 5.4 -- 9.5 -- $392 -- 34 Percent