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As @Tenderloin said, we bought the house for £550k in November. 5% (a usual guide estimate) is £27.5k. The office was a shade under £17k.
Even with room for error, I'm comfortable with the fact that the investment has increased the value of the house by as much, if not more than I paid for it.
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5% seems a bit arbitrary (given the possible variation in original price) but the main thing is you're doing it early on and getting full use of the improvement. Sadly our current garden isn't big enough for a proper shed but we looked at getting a loft extension before we move and have been advised it's not worth the disruption for an unknown ROI, if we're not going get any use out of it.
I wouldn't have thought so, tbh. It's nice but if it's that easy, there's no point paying extra for it.