For the regional benchmark behind these numbers, see the 2026 Construction Price Index.
What decides your number
Two addition 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 $151,000 to $220,000.
Ranges below are what each finish level typically sells for, at normal access.
Basic
$151-171kStandard
$159-179kPremium
$174-194kLuxury
$198-220k2 · Site access
An easy ground-floor addition 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 LA
Local trade wages and material costs set the baseline, and Louisiana's larger metros run higher than its smaller cities. The same addition costs more in New Orleans, Baton Rouge or Shreveport than in Lafayette, Lake Charles, Metairie or other cities in LA.
Where the money goes, and why markup is not margin
Here is a standard-finish, normal-access Louisiana addition, 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 | - | - | - | - | $12,698 | $12,698 |
| Site Prep & Demolition | $432 | $132 | $528 | $3,520 | - | $4,612 |
| Excavation & Foundation | - | $352 | $4,136 | $18,744 | - | $23,232 |
| Structure & Framing | - | - | - | $30,008 | - | $30,008 |
| Exterior Envelope | - | $3,960 | - | $16,192 | - | $20,152 |
| MEP Rough-In | - | $352 | - | $19,096 | - | $19,448 |
| Insulation & Vapor Barrier | - | - | - | $4,928 | - | $4,928 |
| Drywall & Wall Prep | - | - | - | $4,840 | - | $4,840 |
| Interior Finishes | - | $4,356 | - | $14,740 | - | $19,096 |
| Fixtures & Trim-Out | - | $5,060 | - | $3,608 | - | $8,668 |
| Closeout | $1,008 | - | - | $352 | $352 | $1,712 |
| Contingency | - | - | - | - | - | $0 |
| Your cost | $1,440 | $14,212 | $4,664 | $116,028 | $13,050 | $149,394 |
| Markup | $57640% | $1,42110% | $46610% | $11,60310% | $00% | $14,066~9.4% |
| Price | $2,016 | $15,633 | $5,130 | $127,631 | $13,050 | $163,460 |
Contingency is shown at $0 here. When you price a real job, account for it, typically 5 to 10% of cost.
Markup and margin are the same profit, not the same number. This job's 9.4% markup on your cost works out to only a 8.6% margin on the price. Markup is figured against your cost and margin against the higher sell price, so margin always lands lower. Price off the markup as if it were your margin and the job comes up short.
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Common questions
- How much does a home addition cost in Louisiana in 2026?
- A standard home addition in Louisiana costs a contractor about $149,394 to build, and at TradesMetrics default markups typically sells for about $163,460. 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 addition 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 home addition cost per square foot?
- A full addition build typically sells for about $240 to $270 per square foot at a standard finish, more for premium and luxury.
- Why does the price vary so much?
- For a Louisiana addition, 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 addition priced with TradesMetrics default markups, the work costs you $149,394 and the client pays $163,460, the Price total of the table. That $14,066 difference is the same profit measured two ways: 9.4 percent of your cost (markup) but only 8.6 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.