Construction Loan vs. HELOC: Paying for a Remodel in Sonoma County

By Dave Keith, CEO, SCB Builders · November 12, 2026 · Financing

A plain comparison of construction loans and HELOCs for a Sonoma County remodel: how each one pays for the work, what it does to your first mortgage, and which projects tend to fit each.

Most remodels in Sonoma County don't stall on design or permits. They stall when the money isn't lined up. For homeowners who aren't paying cash, the choice usually comes down to two kinds of loan: a home equity line of credit (HELOC) or a construction loan. A few variations of each are also worth knowing.

This guide explains how each one works, what it does to the mortgage you already have, and which projects tend to fit each. SCB Builders is a contractor, not a lender. This is general information, not financial or tax advice. For numbers that apply to you, talk with a loan officer, and with your tax advisor if deductions matter to you.

Custom home construction in Sonoma County, where homeowners often choose between a HELOC and a construction loan
For larger remodels and new work in Sonoma County, the choice between a HELOC and a construction loan often comes down to current equity and whether you want to keep your first mortgage in place.

The short version

  • A HELOC borrows against the equity you already have in your home. You draw money as you need it. It usually sits behind your first mortgage, so that mortgage stays where it is.
  • A construction loan is built around the project itself. The lender releases money in stages, called draws, as the work reaches agreed milestones. It is more common for large projects: additions, major whole-home remodels, and ground-up builds.
  • The deciding questions are usually how much equity you have today, how big and how fixed the scope is, and whether you want to keep your current first-mortgage rate.

How a HELOC works for a remodel

A HELOC is a revolving line of credit secured by your home. You're approved for a maximum amount based on your available equity and your finances. Then you borrow against it as bills come due. You pay interest only on what you've drawn, not on the full line.

Why remodeling homeowners like it:

  • Your first mortgage stays put. A HELOC normally sits in second position. If you're holding a low rate on your first mortgage, keeping it is often what decides whether the project happens at all.
  • Flexible timing. You can draw for the deposit, then for each progress payment, without borrowing the whole amount on day one.
  • Less project paperwork. A HELOC is underwritten on your home and your finances. Lenders generally don't run a draw-by-draw process tied to the job site the way construction lenders do. Confirm this with your lender.

What to watch:

  • The limit is based on equity you have today. If the project costs more than your current equity supports, a standard HELOC may not cover the full scope.
  • Rate and payment terms vary by product. Many HELOCs carry variable rates, and they have a draw period followed by a repayment period. Ask exactly how the rate is set and when payments change.
  • Discipline matters. Because the line is flexible, it's easy to let it cover more than the remodel. Keep the project draws separate and documented.

Related options you may hear about:

  • Closed-end second (home equity loan): one lump sum at closing, usually on a fixed payment. It suits a scope that's already bid and priced.
  • Renovation HELOC: some lenders calculate equity on the home's projected value after the remodel, not what it's worth today. It can help when today's equity falls short of a larger scope.
  • Cash-out refinance: replaces your current first mortgage with a larger one and pays you the difference. It can make sense if your existing rate isn't worth protecting.

You can see these options side by side on our Financing page.

How a construction loan works for a remodel

A construction loan is sized and managed around the project. Instead of handing you a line to draw on freely, the lender pays out in stages as the work progresses. Each stage typically follows a milestone that is checked before funds are released. When the project is finished, the loan either converts to long-term financing or is refinanced. The details depend on the product.

Where it fits:

  • Larger scopes (additions, second stories, down-to-the-studs remodels, or a new ADU) where the cost is high compared with the equity you have today.
  • Projects where the finished value matters to the lender. Many construction and renovation programs look at the expected value of the completed home, based on your plans, specifications, and comparable sales.
  • Homeowners who want a defined structure. A draw schedule tied to milestones gives you, the lender, and the builder one shared plan for when money moves.

What to watch:

  • More paperwork up front. Expect the lender to ask for detailed plans, a line-item budget, a construction schedule, and your contractor's license and insurance documentation.
  • Draw timing. Inspections and approvals take time. Your contract's payment schedule and the lender's draw schedule should match, so nobody waits on money mid-project.
  • Your first mortgage. Some construction programs leave it in place. Others pay it off as part of the new loan. Ask which applies before you commit.

Side-by-side

HELOC / home equity Construction or renovation loan
Borrowing is based on Equity you have today (renovation HELOCs may use the after-remodel value) The project budget and, often, the expected finished value
How money is released You draw as needed In stages, tied to milestones and inspections
Effect on your first mortgage Usually stays in place (second position) Depends on the program. Ask your lender.
Paperwork tied to the project Lighter Heavier: plans, line-item budget, schedule, contractor documents
Tends to fit Kitchens, baths, mid-size remodels, a scope covered by current equity Additions, whole-home remodels, ADUs, projects larger than current equity

Questions to ask any lender before you choose

  1. Is the rate fixed or variable? If variable, how is it set, and how often can it change?
  2. Will my current first mortgage stay in place?
  3. Is the amount based on my home's value today, or on the value after the remodel?
  4. How are funds released? Does the lender require inspections before each draw?
  5. What will you need from my contractor, and when?
  6. What are the closing costs, annual fees, and any prepayment terms?
  7. How long from application to funding?

A note on taxes

According to IRS Publication 936 (2025 edition), interest on home equity loans and lines of credit is deductible only if the borrowed money is used to buy, build, or substantially improve the home that secures the loan, and other requirements are met. Whether that applies to you depends on your whole tax picture. Confirm with your tax advisor before you count on it.

How SCB Builders helps either way

Whichever route you choose, lenders want the same things from your builder: a clear scope, a realistic budget, and a schedule they can trust. On every project, we provide:

  • A line-item estimate, not a single lump number, so the lender and you can see where the money goes.
  • A schedule and payment plan that can be matched to a lender's draw schedule.
  • License, bonding, and insurance documentation. SCB Builders is licensed by the California Contractors State License Board, CSLB #1050494.

The best time to sort out financing is before the bid is final. Then the design and the budget land together, and you don't have to redesign later. SCB works with Priority Financial Network so homeowners can compare equity, renovation, and construction options while we price the scope. Start on our Financing page.

Talk with us about your remodel

If you're weighing a remodel, addition, or ADU in Sonoma County, we'll give you a realistic scope and price to take to your lender. Call (707) 546-2228, email info@scbbuild.com, or contact us for a free consultation. Our office is at 3690 Santa Rosa Ave, Santa Rosa, CA 95407, open Monday through Friday, 8am to 5pm.

SCB Builders, Inc. is a licensed general contractor (CSLB #1050494), not a lender or tax advisor. Loan availability, terms, and timing depend on the lender and your eligibility.

Sources (checked November 11, 2026)

  • SCB Builders, Financing page, https://scbbuild.com/financing: the product types (Fast/Traditional/Renovation HELOC, closed-end second, cash-out refinance), the "second position" FAQ, and Priority Financial Network as partner.
  • IRS, Publication 936 (2025), Home Mortgage Interest Deduction, https://www.irs.gov/publications/p936: home equity interest deductible only when proceeds are used to buy, build, or substantially improve the home.

Dave Keith, CEO, SCB Builders