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Wood rot and window frame repair

  • Rotten wood removed to sound wood
  • Repaired with filler or new timber
  • Finished with undercoat and gloss
  • Honest advice: repair or replace
Wood rot being repaired on a door frame before it is repainted
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Window sill with wood rot before repair by Oranje Kwast The same window sill, repaired and painted by Oranje Kwast BeforeAfter
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Tackling wood rot before it spreads

Wood rot starts small. A soft spot in the bottom rail, paint blistering in the corner of a window, a gap between the frame and the glazing bead. In Amsterdam and the Zaan region, with many timber frames, old buildings and a damp maritime climate, it is one of the most common defects on the outside of a house. Tackling it early stops a repairable spot from growing into a frame that has to be replaced.

Oranje Kwast removes and repairs wood rot in window frames, doors, sills and other woodwork, then finishes it again with undercoat and gloss. That way the wood is not only repaired but protected against moisture once more. Our painter first checks how far the damage goes and tells you honestly whether repair still makes sense, or whether another part of the frame needs attention too. You then receive a quote that states what will be done at each spot, so you are not faced with unexpected costs.

Especially in a region with characteristic timber houses, such as the Zaan houses in Zaandijk and Koog aan de Zaan, careful wood repair is skilled work: the profile and character of the old wood must be preserved. Not sure whether you are dealing with wood rot? Request a free consultation, or first take a look at the project window frame before and after.

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Recognising wood rot

Wood rot develops when wood stays damp for a long time. Fungi then break the wood down from the inside, often without much being visible on the outside. The bottom of window frames, the corners where stiles and sills meet and the underside of doors are the well-known weak spots, because rainwater lingers there. The wrong choice of paint, or a coat applied too thickly, can also trap moisture in the wood.

Signs include flaking or blistering paint, dark discolouration, joints that have opened up and wood that feels soft when you press a screwdriver into it. A detailed explanation of the symptoms is given under recognising wood rot in window frames.

How wood rot is repaired

A proper repair is more than a bit of filler over a soft spot. If affected wood is left behind, the rot simply carries on under the new paint, and a few years later you face the same problem again.

  • Routing out all affected wood, down to sound, dry timber.
  • Pre-treating the exposed wood, so the repair bonds firmly.
  • Filling with a two-component wood filler, or for major damage with a spliced-in piece of new timber.
  • Priming and finishing the repaired section and the frame, so everything forms one whole again.

Repair or replace, and what it costs

In many cases repair is the most sensible choice. After an expert repair, a frame with a few rotten spots can last a long time again, for less money than a new frame. What is more, the original frame is preserved, which is worth a great deal in older buildings and Zaan timber houses. If the wood is affected over long stretches or the rot runs deep into the structure, replacement may be better. The trade-off is explained under painting or replacing window frames.

The cost depends on the number of spots, how deep the damage goes and how easy the frame is to reach. That is why Oranje Kwast prices wood rot repair to measure after the free consultation, excluding VAT and with a minimum charge of €300 per job; the paintwork afterwards is charged at the fixed prices, such as €153 for a window frame. More background is given under what wood rot repair costs. Repairing several frames in one go is often more efficient than doing one frame at a time. For the finish, Oranje Kwast uses premium brands such as Sikkens, Sigma and Wijzonol.

Wood rot and frame repair: before and after

Wooden boards on the outside wall, fascias and back door before and after painting in Amsterdam-Noord
Modern grey front door with a high-gloss finish
Classic green front door of a listed entrance
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What customers say

S Sandra van Dijk Amsterdam

"Very tidy work, everything neatly masked off and left broom-clean. The living room has turned out beautifully."

M Mark de Boer Zaandam

"Quick communication, a fixed price up front and the exterior paintwork looks great. Definitely recommended."

F Fatima El Amrani Amsterdam

"Scheduled within a week and the result is crisper than I had hoped. The window frames look like new."

Client reviews as published on oranjekwast.nl. On Google, Oranje Kwast is rated 5.0 (1 review). View the Google profile
Clear answers

Frequently asked questions

Everything you want to know about wood rot in window frames and doors, and how it is repaired.

How do I know if my window frame has wood rot?

Look out for flaking paint, dark patches and wood that feels soft. Press a screwdriver into the bottom rail: if it sinks in easily, it is time for an inspection.

Can wood rot go away by itself?

No. As long as moisture reaches the wood, the damage continues. The sooner it is repaired, the smaller the repair.

Is repairing cheaper than a new frame?

Usually it is, especially with localised damage. With very extensive wood rot, replacement may work out cheaper in the long run, and you will get honest advice on that.

How long does a wood rot repair last?

A well-executed repair under a closed coat of paint lasts a long time, provided the paintwork is maintained on time afterwards.

Can wood rot be repaired in any season?

The wood has to be dry and the filler needs a minimum temperature to cure properly. That is why this work is usually done between spring and early autumn.

Is the whole frame painted after the repair?

That is certainly advisable. The repaired section gets undercoat and gloss, and by including the whole frame you get an even protective layer again.

Looking for a painter in Amsterdam or Zaandam?

Our painter visits without obligation to discuss your wishes. You receive a clear quote with no surprises afterwards.

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