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Cheers, DIY was probably the wrong thread as i want to pay someone else to do it properly.
We bought the house nearly 3 years ago and it was untouched since the 1970s.
We did the important stuff (gas, electrics, windows), stuck a new kitchen in, added en-suite to the dormer bedroom, and am well aware of surprise costs and the drastic price increase from "ok" to "nice" for finishing kit.
DethBeard
Wrote all of this and then realized we're in home "do it yourself". I have no idea how much it would cost to do it yourself but I'll leave this anyway:
15-30k I think probably covers 75% of reasonable conversions like you described. Could very easily be much more money. You can very easily run into a problem that cost 5K.
You have to consider expensive materials (floors, windows), HVAC, insulation, ventilation, gutters, moving the gas line.... what are you going to do with the garage door, and what does it mean for insulation and ventilation?
Proper ventilation and insulation is a really big deal if it gets below freezing, or else you will get giant ice dams. This is the kind of issue that could ruin the project...
Materials you choose to use will greatly affect the price. You might be surprised by how disappointed you are with the affordable options. "Oh hey I like that tile" = 15 bucks each, while "No I don't really like that tile" = 3 bucks each
I just went through all of this with an entire house so I have an idea of what's going on.