A spreadsheet? (Excel?)

I looked long and hard for this too! Ended up with excel. I'm tracking planning expenses, design, builder fees, permits, as well as proposed expenses vs actual cost of them. I also keep a binder of all our invoices and manually mark each one when we have paid it. If you are financing your build the bank will want more than excell though. They will want to see that there is an overall budget in place and what fixtures and finishes you have selected. Then as you draw money through the build they will ask for invoices that show you are doing what you said you would.

I would set up a separate bank account and track through MINT or even quickbooks - also get its own cc.