Financing a Nantucket purchase: how island lending actually works

Start with the market context every financed buyer here operates inside: a large share of Nantucket purchases close in cash. At the island's price points, with second homes dominating the buyer pool, that's structural rather than surprising — and it matters to a financed buyer for one practical reason: your competition may not have a financing contingency at all. In July 2026, island home sales averaged 97.63% of asking price, with eight of 21 closing at or above full ask. (Source: LINK MLS, July 2026.) In that market, a financed offer competes on preparation — how fast and how certain your money is — more than on anything else.

None of this means you shouldn't finance. It means the process below isn't paperwork; it's your competitive position — whether the target is the island's entry band or the estate tier.

Most Nantucket purchases exceed the conforming loan limits that define a standard mortgage — the island's median home sale was $3,305,000 in July 2026 (Source: LINK MLS) — so jumbo lending is the norm here, not the exception. That's a mechanism worth understanding rather than a hurdle: jumbo loans aren't sold to the standard government-sponsored channels, so lenders hold more of the risk and underwrite accordingly. In practice that typically means fuller documentation, meaningful reserve requirements, and larger down payments than a conforming borrower would see — and lenders often expect more still on second homes and high-value properties. No two programs match, which is precisely why the pre-approval conversation belongs at the very start of an island search, not after you've found the house.

Island appraisals run slower and demand more judgment than mainland ones, for a structural reason: comparable sales are genuinely thin. A typical Nantucket month sees roughly two dozen sales island-wide across every property type (Source: LINK MLS, 2026 monthly summaries) — an appraiser can't lean on a dozen near-identical recent trades the way they can in a mainland suburb, and the island's districts are different enough that "comparable" takes real local knowledge. Two practical consequences:

Most island purchases are second homes, and lenders underwrite them as their own category. The mechanism, in general terms: occupancy classification — primary residence, second home, or investment property — is a truthful declaration that shapes the lender's risk model, and with it the down payment expectations and pricing tiers you'll be offered. Second-home programs typically expect more equity than primary-residence loans; investment classification, where rental income is the purpose, is different again, with its own documentation around projected income. Two things a buyer should internalize: answer the occupancy question honestly — it's a representation, not a preference — and if rental income is part of your plan, say so at the pre-approval stage so the loan is built for the ownership you actually intend. The rental-income guide covers the earning side; the septic permit quietly caps the occupancy side.

Sequenced properly, a financed island purchase runs on Massachusetts fundamentals with the island's particulars built in. An accepted offer moves to a Purchase & Sale agreement, typically with a deposit — often 5% at P&S — which is the moment your lender's clock truly starts. Underwriting and the appraisal run in parallel with the island diligence: the home and septic inspections, the flood-zone pull, HDC feasibility if you plan to change anything. Insurance binding comes next, and it belongs earlier in the sequence than mainland habit suggests — it is the step most likely to stall an island closing when started late. Then clear title through a Massachusetts closing attorney, and at the closing table the Land Bank fee is paid, the deed records, and the keys change hands. The steps aren't exotic; the discipline is in the order. The complete buying guide walks each one in depth.

None of the above is advice about which loan to take — that's between you, your lender, and your accountant. What a local practice contributes is sequencing and translation: knowing which diligence items a lender will ask for on this island (the Title 5 report, the elevation certificate, the insurance binder), lining them up in the order that protects your deposit, introducing the island-experienced lenders, insurers, and closing attorneys who already know what a Nantucket file looks like — and writing the offer so a financed buyer's timeline reads as credible to a seller weighing it against cash. A mainland lender unfamiliar with the island can cost you a deal simply by not knowing what to expect; the fix is a team that has done this exact transaction before. That introduction is part of the job, and it costs you nothing to ask for it.

Financing an island purchase this season? Tell me your band and your timeline, and I'll tell you honestly what readiness looks like for it — and connect you with people who close here every month. Call or text 508-228-4578, or start with the complete buying guide.

Financing here this season?

Sean Kalman is a REALTOR® and sixth-generation Nantucketer. The Kalman Co. is brokered by eXp Realty. Reach him at sean@thekalmanco.com or 508-228-4578. Equal Housing Opportunity. Nothing on this page is financial, lending, or investment advice.