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Repairing rotten or damaged wooden frames

Problem:
The wooden window of my downstairs bathroom has rotted in one corner, though the rest of it is in good condition. I would prefer to avoid the expense of replacing the window and the resultant damage to the interior decoration, by making a proper, long lasting repair - is there anything on the market that really works and that I could use?

Fix it with:
Wood Repair Polyfilla

You can do it:
Polycell has launched Wood Repair Polyfilla for just this type of application, where traditional repairs to external woodwork simply do not last or work effectively. Wood Repair Polyfilla is an all-new epoxy based solution that has been specially formulated to bond strongly with the surrounding woodwork and produce a long lasting repair that shrugs off all weathers.It sands and shapes easily, just like wood, and with a working time of 30 minutes before it starts setting, the job can easily be completed in one day, including painting or varnishing over. It's easy to mix as it uses a 1:1 mixing ratio of equal proportions of both the resin putty and the hardener putty.

First dig out all the old, rotten wood until you get back to sound timber, then allow the area to dry out. If the wood is still slightly soft, apply a coat of Polycell Wood Hardener to the damaged area and allow to dry. Next, mix up equal proportions of Polycell Wood Repair to provide a sufficient quantity to complete the job. Apply with a small filling knife, working it well into the full depth of the damaged area and fill generously to just above the level of the surrounding wood. If the hole goes right through to the other side, simply tape a piece of card in place until the Wood Repair is set, to stop it falling through. With its strong adhesive properties, it will bond with the surrounding wood and become as strong as the original timber. Wood Repair will set in approximately six hours, after which it can be sanded back level with the original timber. It can then be undercoated and topcoated or will accept staining to match surrounding stained wood, and can be varnished if desired.

Repairs made with Polycell Wood Repair will accept screws, nails or other fixings as it mimics wood in all details. This could be especially useful, for example, if you needed to repair hinges on windows or doors without fear that the repair would fail.