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I'd have thought it extremely unlikely that it was a solid wall if it's that recent.
The usual tells are: age of property (pre- or post- 20s 30s), brickwork bonding (stretcher bond for cavity, header / bonded for solid), and wall thickness (9" vs 12").
If it's an extension, it may be in the plans submitted to the council.
I'm not sure how either would affect how you mount the TV - for an old wall, crumbly brick might be a problem, I guess.
NotThamesWater
Sorry for the really basic question, but I’m trying to determine whether the walls in our extension are solid or cavity. I believe it was built in the ‘80s and measures 12” (see pic).
I want to mount a tv on the wall and want to make sure I use the correct method. Cheers