For the regional benchmark behind these numbers, see the 2026 Construction Price Index.
What decides your number
Two basement projects the same size can land thousands apart. Three things move the total more than anything else, and the first one does most of the work.
TradesMetrics prices every job at one of four finish levels. This single choice is what stretches the sell price from $76,000 to $127,000.
Ranges below are what each finish level typically sells for, at normal access.
Basic
$76-84kStandard
$84-92kPremium
$97-105kLuxury
$118-127k2 · Site access
An easy ground-floor basement with parking is cheaper to work in than a tight upper-floor space with stairs and no loading. Difficult access adds labor hours for moving materials and debris.
3 · Where in GU
Local trade wages and material costs set the baseline, and Guam's larger metros run higher than its smaller cities. The same basement costs more in Hagatna, Dededo or Tamuning than in Mangilao, Yigo, Barrigada or other cities in GU.
Where the money goes, and why markup is not margin
Here is a standard-finish, normal-access Guam basement, milestone by milestone, then your cost, markup and price broken out by type. Ballpark for planning, not a line-item quote.
| Milestone | Lab | Mat | Equ | Sub | Fee | Total |
|---|---|---|---|---|---|---|
| Permits & Fees | - | - | - | - | $3,000 | $3,000 |
| Site Prep & Demolition | $360 | - | $315 | $1,425 | - | $2,100 |
| Excavation & Foundation | - | - | $750 | $5,250 | - | $6,000 |
| Structure & Framing | - | - | - | $7,050 | - | $7,050 |
| MEP Rough-In | - | - | - | $9,750 | - | $9,750 |
| Insulation & Vapor Barrier | - | - | - | $5,250 | - | $5,250 |
| Drywall & Wall Prep | - | - | - | $6,300 | - | $6,300 |
| Interior Finishes | - | $4,350 | - | $16,425 | - | $20,775 |
| Cabinetry & Countertops | - | $4,275 | - | $3,300 | - | $7,575 |
| Fixtures & Trim-Out | - | $2,400 | - | $6,225 | - | $8,625 |
| Closeout | $810 | - | - | $600 | - | $1,410 |
| Contingency | - | - | - | - | - | $0 |
| Your cost | $1,170 | $11,025 | $1,065 | $61,575 | $3,000 | $77,835 |
| Markup | $46840% | $1,10310% | $10710% | $6,15810% | $00% | $7,836~10.1% |
| Price | $1,638 | $12,128 | $1,172 | $67,733 | $3,000 | $85,671 |
Contingency is shown at $0 here. When you price a real job, account for it, typically 5 to 10% of cost.
Price and cost part ways at markup: the job's 10.1% markup over cost is only a 9.1% margin of the price. It's the same profit dollars measured two ways — markup divides by your cost, margin by the larger price — so the margin is always the smaller number. Underprice that gap and the bid quietly loses money.
Full markup vs margin guide →Get your exact number, free
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Common questions
- How much does a basement renovation cost in Guam in 2026?
- A standard basement renovation in Guam costs a contractor about $77,835 to build, and at TradesMetrics default markups typically sells for about $85,671. See the ranges above for basic through luxury and easy through difficult access.
- What is the difference between basic, standard, premium and luxury?
- Basic is a full-scope basement build at entry finish: budget materials and standard fixtures, same layout. Standard steps up to mid-range materials and finishes with minor changes. Premium is semi-custom with high-end finishes and some layout change. Luxury is full custom: reworked layout and top-tier materials throughout.
- How much does a basement renovation cost per square foot?
- A full basement remodel typically sells for about $80 to $90 per square foot at a standard finish, more for premium and luxury.
- Why does the price vary so much?
- For a Guam basement, finish level is the biggest driver, then site access and where in the state you build. Trade wages vary by region, and larger metros run higher than smaller cities.
- Is this an estimate or a quote?
- It is an estimate: a planning range built from regional cost data and your finish level. A quote is a firm price a contractor gives after seeing the site and final selections. Use the estimate to set a budget, then get a quote to lock it in.
- How much should I budget for surprises?
- The base already reflects typical job costs, so you do not need a routine overrun buffer. Add an optional contingency (commonly 5 to 15 percent) only when a job carries real unknowns, like old wiring or plumbing you cannot see until the work opens up.
- What is the difference between markup and margin?
- On a standard basement priced with TradesMetrics default markups, the work costs you $77,835 and the client pays $85,671, the Price total of the table. That $7,836 difference is the same profit measured two ways: 10.1 percent of your cost (markup) but only 9.1 percent of the price (margin), because margin divides the same dollars by the larger price. The base already reflects typical job costs, so no contingency is added by default.
- What is the real cost of labor on a job?
- Base wage is not the real cost. Once you add payroll taxes, workers comp, benefits and paid time off, a worker costs 35 to 50 percent more than their hourly wage. Estimating off base wage is a common way to lose money.