Trace the exact shape of the sill.
Interior wood window sill replacement.
Next cut underneath the window sill to free the sill from the trim board under it.
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Place your old window sill on top of your new wood.
Cut out the shape using a table saw and hand saw.
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Sand with an orbital sander.
Buy more than one board if you think you ll need an extra attempt.
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If you can t salvage the old sill for a template measure the sill space and draw a new sill template on your board.
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Place your old sill over the selected board and draw its outline with your carpenter s pencil.
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The first step for how to replace an interior window sill is using your utility knife to cut the caulk between the window sill and the trim.
After that place your putty knife between the wall and the trim and pry the trim away from the wall.