Bulk Plasterboard and adhesive - wise to buy online or not?

[Simplez]

I need to plaster the whole house including the ceilings

All walls are 2.7m high
downstairs

Room1: 4.1m x 3.7 = 15.17 m2 / 42.12 walls
Room2: 4.1 x 4.3 = 17.63 / 45.36
Hallway: 4.9x 1.1 = 5.39 / 32.4

Back hallway: 1.4 x 1.6 = 2.24 / 16.2
Landing: 4 x 1.1 = 4.4 / 28.08
Bedroom 1 = 3.3x 3 = 9.9 / 34.02
Bedroom 2 = 3.6 x 3 = 10.8 / 35.64
Bedroom 3 = 2.6x 2 = 5.2 / 28.08

70m2 for ceilings plus 261.90 = total 331.9 plus 10% wastage so about 365 m2

if a sheet is 2.4 x 1.2 = 2.88m2

I need 126 sheets?

How many bags of adhesive will I need for the walls? 2 bags per sheet so about 60 bags?

How much PVA will I need as well?

 

[sircerebus666]

Don't your rooms have doors and windows?

 

[sircerebus666]

Are all your walls solid or do you have any studs?

Are you planning to do this work yourself or will you have helpers? The reason I ask is putting up 8 by 4 sheets on a ceiling is a total bitch on your own