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I went through exactly this last year – it’s a lot to figure out at first. We wanted about 20 m² extra and ended up spending around €45-55k all-in (including foundation, permits, materials, labour), but prices vary a ton depending on finish level and location. Biggest advice: get multiple quotes and really check references/portfolio. We found a solid, no-nonsense team via https://cbsrenovation.nl/consumer/construction-of-a-home-extension/ who explained the permit process clearly and didn’t try to upsell unnecessary stuff. Saved us some headaches. Start with a sketch of what you want and talk to a few companies early. Good luck with your project!