The asgard sheds are fantastic. Don't just limit yourself to the ones they describe as bike sheds - there may be an option there that fits your requirements under the guise of something like a fishing tackle shed or something.
FWIW I currently have 3 "Tool Sheds" from Asgard that I use for bike storage - due to their short doors and narrow depth they fit in the available space perfectly.
I can fit two bikes in at ground level and one hung up on hooks in each.
Don't pay list price for the sheds - they regularly run promotions giving 10% off the price (normally to coincide with sporting events).
FWIW I currently have 3 "Tool Sheds" from Asgard that I use for bike storage - due to their short doors and narrow depth they fit in the available space perfectly.
I can fit two bikes in at ground level and one hung up on hooks in each.
Don't pay list price for the sheds - they regularly run promotions giving 10% off the price (normally to coincide with sporting events).