How to Finance a Home Addition: The Options Compared

The five options at a glance

The question that decides it

Start with your existing mortgage rate. If it is well below current market rates, a cash-out refinance means giving up that rate on your entire balance to borrow a fraction of it — usually a bad trade, and the reason HELOCs and home equity loans have been the default choice for homeowners who bought or refinanced when rates were low.

If your existing rate is at or above current market rates, a cash-out refinance can consolidate everything into one loan at a better rate, and it becomes the strongest option.

HELOC versus home equity loan

Both are second liens against your equity, and the difference is structure. A HELOC is a revolving line you draw against as the project progresses, so you only pay interest on what you have actually used — which fits construction well, since money goes out in stages. The rate is typically variable.

A home equity loan is a lump sum at a fixed rate with a fixed payment. It is the right choice when the project scope and price are firmly settled and you want certainty in the payment.

This is one place a fixed-price contract genuinely helps: when the total is known before construction begins, a fixed-rate loan sized to that number is straightforward. With a cost-plus estimate, you are borrowing against a guess.

Renovation loans

An FHA 203(k) or Fannie Mae HomeStyle loan is underwritten against the home’s projected value after the work is done, rather than its current value. That makes them the practical option when there is not enough existing equity to borrow against — particularly for buyers renovating a house they are purchasing.

The tradeoffs are real: more documentation, an appraisal based on plans and specifications, draws released as work is inspected, and requirements the contractor has to meet. Plan for a longer timeline to close.

How payment schedules work

Regardless of financing, a well-structured remodeling contract ties payments to completed milestones rather than to calendar dates. That protects you and it also smooths the draw schedule on a HELOC or renovation loan. Be cautious of any contractor requesting a large share of the total before work begins.

This is general information, not financial advice — loan terms, rates, and qualification vary, and a mortgage professional should review your specific situation. See our fixed-price contract guide or request an estimate to get a firm number to plan against.