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All 4 of my bedroom windows have rotten exterior sills that badly need replaced. I have had 3 quotes from window restorers / joiners and the prices vary depending on method. Some say it is necessary to replace the whole sill, including the part that runs under the window frame to the interior wall, others say they only need to cut out the exterior part and then replace it with half of a new sill, cut to fit. Only thing that worries me though is how weather proof would the join be?

Any advice would be much appreciated.

I dont know if this helps,but here goes
Have you considered changing the windows to upvc.You dont have to replace the entire wood surround.
They are called box sash inserts very east to fit and you can seal the entire exterior wood with plastic trims.
The cost of replacing the cills will probably be cheaper but in the long run
you get less heat loss and maintaince free windows.Ask your local upvc company for a quote, Hope this helps

[quote="welsh brickie"]I dont know if this helps,but here goes
Have you considered changing the windows to upvc.You dont have to replace the entire wood surround.
They are called box sash inserts very east to fit and you can seal the entire exterior wood with plastic trims.
The cost of replacing the cills will probably be cheaper but in the long run
you get less heat loss and maintaince free windows.Ask your local upvc company for a quote, Hope this helps[/quote]

Thanks very much for the suggestion but I live in a conservation area and am not sure upvc is really allowed! I also would prefer to retain the original windows as they suit the property so well and I have original stained glass as part of the glazing.

hi hope this can help, i have done a few sah box renovations and there are some very good fillers on the market just for this type of job, the repairer would cut out all the rottern and refill with compound and timber if needed, sand down to accept paint, i dont know were you live but would expect to pay £300.00 to £350.00 approx to renovate the whole window inc new sash ropes, draught strips, anti rattle strips etc, hope this helps

Hi, I had the same problem a couple of years ago, we actually had the complete sills replaced on two windows. It was simply one block of new wood on each window, with some some kind of damp proofing course treatment under it. It took two hours and cost me £100 pounds.

I then filled any fine gaps with Ronseal wood filler, sanded down the wood, treated any knots, treated with wood preservative, undercoated with Aluminium-Oxide harsh-weather paint, and then painted as usual.

RK.

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