The Real Cost of Owning in Tumon, Guam

Why 'All-In' Costs More on an Island 3,800 Miles From the Mainland

Guam is not connected to any other US jurisdiction by bridge, road, or shared power grid -- it is an island territory roughly 3,800 miles west of Honolulu, and essentially everything not grown or made locally arrives by ship or plane. That geography alone changes the cost structure of owning property here: construction materials, replacement parts, insurance underwriting, and even routine home maintenance carry a real island premium that a comparable mainland or even Hawaii property doesn't face at the same scale.

On top of that base reality, Tumon-specific ownership means budgeting for Guam's own property tax system, a territorial business tax that applies to rental income, mandatory typhoon-resistant construction standards that raise build and repair costs, and flood exposure across essentially the entire coastal strip the hotel district sits on.

Purchase Price: What the Numbers Actually Show

Territory-wide, a September 2025 market snapshot put move-in-ready, concrete-construction single-family homes on Guam in the roughly $460,000-$500,000 range, with homes selling after a median of about 127 days on market and more supply than demand pointing toward a buyer's market overall. Tumon itself is a different product mix -- it is overwhelmingly a condo and condotel market rather than single-family homes, given its role as the island's dense resort strip. Individual Tumon condo listings found in this research spanned roughly $290,000 at the low end to $790,000 for higher-end oceanfront units, but this page did not find a verified, current median price specific to Tumon condos as distinct from the territory-wide figure -- treat any single listing site's Tumon-specific median with real caution given how thin and mixed that inventory is.

Guam's Alien Land ownership rules also shape who can buy what here: non-US citizens who have not declared intent to become permanent Guam residents are generally limited to purchasing a single residential property in their own name, and that property must be owner-occupied. Investment purchases by non-citizen buyers typically require forming a Guam corporation with at least one local shareholder -- a real structural step that a mainland-market buyer wouldn't encounter, and one worth confirming with a Guam-licensed real estate attorney before assuming a straightforward personal-name purchase is available.

Real Property Tax: Genuinely Low Rates, a Real Assessment History

Guam's real property tax is levied at 0.0972% of assessed land value and 0.3889% of assessed improvement value annually, according to the Guam Department of Revenue and Taxation -- rates that are genuinely low by mainland US standards on their face. The more important number to understand is the assessed-value percentage applied against a property's appraised value: the Guam Legislature has changed this rate more than once, moving from 70% to 90% to a brief 100% and back down to 90% as of 2016, per Guam Office of Public Accountability audit materials. That history matters because it means the effective tax bill on a given appraised value can shift with legislative action independent of any change in the property's market value -- confirm the current assessed-value percentage and a specific parcel's current assessment directly with the Department of Revenue and Taxation before budgeting a number.

The Business Privilege Tax: A Real Cost for Any Rental Income

Guam imposes a Business Privilege Tax (BPT) -- the renamed, still-functionally-identical successor to what was previously called the Gross Receipts Tax -- at 5% of gross receipts, a rate that took effect June 1, 2018, up from 4% previously. This tax applies broadly to business activity conducted in Guam, and rental of real property is explicitly included in what counts as taxable gross income under Guam law. That means any owner renting a Tumon property short-term or long-term should plan on a 5% BPT exposure on the rental income itself, on top of any federal-mirror income tax owed on net profit -- a real, recurring cost this page's Vacation Rental Investment page covers in more depth.

Insurance and Construction: Built for 195+ MPH Winds, at a Real Cost

Guam's building code requires new construction to resist sustained winds of 195 mph or higher, and reinforced concrete is effectively the mandatory dominant construction material territory-wide -- wood and tin structures have historically suffered the worst documented damage in past typhoons, per FEMA building-science materials and Guam contractor-licensing resources. Concrete construction of this kind costs more upfront than lighter-frame construction common on the mainland, and it's a genuine, structural reason Guam homes are typically built the way they are rather than a stylistic choice.

This page did not find a specific, current windstorm or homeowners insurance premium figure for a Tumon address. Given Guam's confirmed, direct-hit typhoon history -- Super Typhoon Pongsona in 2002 and Typhoon Mawar in 2023, both covered in full on this site's Hurricane & Storm Risk page -- get an actual quote from a Guam-licensed insurance broker before assuming a specific premium, and ask directly how the carrier treats concrete versus non-concrete construction in its underwriting.

Flood Insurance: Coastal Exposure Across the Tumon Strip

FEMA classifies all of Guam's coastal zones as high flood risk, with Special Flood Hazard Areas mapped for storm surge, wave hazard, and coastal erosion -- and Tumon's entire hotel-and-condo strip sits directly along Tumon Bay, meaning flood insurance is a realistic requirement for essentially any Tumon property with a mortgage. No specific, current average flood insurance premium for a Tumon address was independently confirmed this research pass; flood costs vary too much by exact elevation, structure type, and coverage amount to state one responsibly. Get an actual National Flood Insurance Program or private-market quote before budgeting a figure.

The Broader Cost-of-Living Premium

Beyond taxes and insurance, day-to-day ownership costs run meaningfully higher on Guam than on the mainland. Multiple cost-of-living trackers estimate Guam's overall cost of living at roughly 50% above the US mainland average, with groceries specifically estimated around 28% higher and rent averaging roughly 16% higher, according to Numbeo-sourced comparisons. A major structural driver is the Jones Act of 1920, which requires that cargo moving between US ports -- including to Guam -- travel on US-flagged, US-built, US-crewed vessels, a real and frequently cited factor in why imported goods, building materials, and even routine appliance replacement cost more here than the shipping distance alone would suggest. The Guam Power Authority's electricity rates also run above the US national average, driven by the island's dependence on imported fuel for power generation -- a genuinely relevant ongoing cost for any owner, and one worth asking a current Tumon resident or property manager about directly rather than assuming a mainland utility bill as a baseline.

Adding It Up: A Framework, Not a Guaranteed Number

There is no single, verified 'true cost of ownership' figure this page states as settled fact, because the largest variable line items -- a specific windstorm premium, a specific flood premium, and any condo or homeowners association dues specific to an individual Tumon building -- don't have a current, publicly quoted figure this research could confirm. What can be said with sourced confidence: expect a genuinely low real property tax rate (0.0972% land / 0.3889% improvements against 90% of appraised value), a 5% Business Privilege Tax on any rental income, insurance and construction costs shaped by a 195+ mph wind-resistance building code, coastal flood exposure across the Tumon strip, and a roughly 50%-above-mainland cost of living driven substantially by Jones Act shipping costs.

Before making an offer, get current written numbers from the real sources: the Guam Department of Revenue and Taxation for property tax and BPT specifics, a Guam-licensed insurance broker for windstorm and flood premiums, and a Guam-focused buyer's agent who can pull recent comparable Tumon sales and speak to condo association dues for the specific building under consideration.