A garage conversion sits in an awkward financing spot: too large for most people to pay cash, but often too small to justify the complexity of a full construction loan. Here's how the realistic options actually compare.
The main options
| Option | How it works | Best for |
|---|---|---|
| Cash / savings | Pay as you go, no debt or interest | Smaller conversions (office, gym) without added plumbing |
| HELOC | A revolving line of credit secured against your home's equity — draw as needed during the project | Homeowners with substantial equity who want flexibility on timing and draws |
| Cash-out refinance | Replace your existing mortgage with a larger one, taking the difference in cash | Homeowners who can improve or maintain their rate, and want one fixed payment instead of a variable line |
| Renovation loan | A loan (e.g. FHA 203(k)-type or similar renovation-specific products) that bases the loan amount partly on the home's value after the conversion is complete | Homeowners without enough current equity to cover the project through a HELOC alone |
| Personal or contractor financing | Unsecured loan, sometimes offered directly by the contractor | Smaller gaps in a budget — usually the highest interest rate of the group |
What actually matters when choosing
- How much equity you already have. A HELOC is capped by your current home equity — if the conversion itself is what creates most of the value, a HELOC alone may not cover it.
- Rate type. HELOCs are typically variable-rate; a cash-out refinance or renovation loan is usually fixed. On a project you're financing for several years, that difference compounds.
- How you'll draw the money. A HELOC lets you draw as costs come in, which matches how contractors are usually paid (in phases). A refinance or renovation loan typically disburses in a lump sum or through a draw schedule tied to inspections.
- Whether you're planning to rent the space. If the conversion is meant to produce rental income, some lenders will factor projected rent into how much you can borrow on a renovation loan — worth asking about specifically.
A rough way to think about it
If you have significant equity and want flexibility, a HELOC is usually the simplest path. If you don't have enough current equity to cover the project, or you want one predictable fixed payment instead of a variable line, a renovation loan or cash-out refinance is worth comparing directly against it. Either way, get quotes from more than one lender — the difference in terms between lenders on renovation-specific products is often larger than people expect.
Get the cost estimate first. Financing decisions are easier once you know roughly what you're borrowing for. Start with Garage Conversion Cost Guide 2026 if you haven't already.