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Detached Garage refirb

Joined
10 Aug 2025
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United Kingdom
Hi People,
Looking for some tips, moving into a new home in a week, got a detached Garage with a proper apex roof. The garage itself is doubled bricked (outer house brick, air gap then breeze block) wooden studs and plasterboarded.
I'll attach pictures...but the garage seems decent enough for what I'm looking for i.e. store all my tools, a basic home gym, a ceiling hung punch bag and general storage I.e. lawn mower, strimmer, bikes etc.
I live in Scotland, near Glasgow and want to control the humidity in the garage as don't want tools to be moisture damaged in future, also looking to use this garage as a work area to cut timber for any DIY down the line and would be ideal to leave timber in the garage during renovation but don't want it to become damaged with the moisture.
You can see in the pics that it looks to be rusted screw/nails showing through the plasterboard? Obviously moisture has got to these but I'm looking to control it so any tips.
I have noticed the garage has two lower vents to the west side ( that's the prevailing wind in this area). And the current owner has taped one up which I imagine is to stop drafts maybe. I know since being built (2001 roughly, all new build estate houses along with the garage) the owner had put new front doors to make it more air tight so think Air circulation may be a big factor?
Was looking to uncover the 1 out of two current lower vents and add another two opposite wall for air flow, also adding one high vent each side (west and east) as I know warm air rises...so thinking this would give good air flow and get humid air moving?
Looking to put an extractor fan in aswell on ceiling in the center so it sits in the loft with ducting (mainly for when cutting wood or using the gym).
These air vents are obviously good for airing the room but wondering about temperature as would no doubt get cold, similar temp to outside and I hear a damp house is a cold house, so just looking for any suggestions. I don't want to put heaters in as such a waste of money for wat I plan to use the space for. Dehumidifiers seem good but are they necessary if proper ventilation?
Cheers guys.
 

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