I'm in the early stages of looking at a mortgage. I'm quite naive about anything like this though so would appreciate some advice from you knowledgable lot 
I'm 23 and I currently earn about £10,800 a year. I have student debts of around 12k (scottish system so just living costs I think) but no other debts. DP is paying off tax debts in the next month or two. Then he's debt free. DP earns around 12k.
We live very cheaply and our joint outgoings would probably be about £900 per month maximum.
I have 3k in savings and I'm confident we could save at least 15k over the next 3 years as we live at home with my parents just now.We'd hope to use the help to buy ISA from Autumn this year to get the governemnt to contribute at least 3k to the deposit pot.
So basically in a few years time we would hope to have at least a 20k deposit. I don't think our earnings will rise by much so we'd probably be on about 22k per year.
Ideally we'd like to either buy land (for a "tiny house") or a property of around 60-80k.
How likely is it we could get a mortgage?
TIA