How much does sunroom addition cost in Billings, MT?

Most Billings homeowners spend between $24,500 – $81,600 on sunroom addition, with an average around $53,000. Local labor prices 2% above the national average, so Billings quotes tend to land at the higher end of national ranges.

Why is sunroom addition more or less expensive in Billings than elsewhere?

Licensed trade labor in Billings runs about 102% of the national average, and the best crews book out fastest in spring and early summer. Montana weather drives material choices here, so ask contractors what they install most often in Billings and why.

Do I need a permit for sunroom addition in Billings, Montana?

Most Billings, MT projects that change structure, electrical, plumbing or mechanical systems need a permit from the local building department; cosmetic work usually does not. Always confirm current requirements with the local building department before signing a contract, and make sure the permit is pulled by your licensed contractor.

How many quotes should I get in Billings?

Get at least three written quotes from licensed, insured Montana contractors. Comparing line items — not just the bottom line — is the fastest way to spot an inflated bid in the Billings metro market.

How much does sunroom addition cost in 2026?

Most homeowners pay between $24,000 and $80,000, with a national average near $52,000. Small, simple jobs land at the low end; large or premium-material jobs run well above the high end.

What is the cost per square foot?

Installed pricing usually runs $120.00 to $400.00 per square foot, including labor and materials. Expensive metros can run 15–45% higher than that range.

What drives the price up the most?

Scope and access. Larger quantities lower your per-square foot price, but difficult access, demolition of existing work, structural repairs found mid-job, premium materials and rush scheduling each add 8–30%.

Permits are typically required when the work changes structure or ties into electrical, plumbing, gas or mechanical systems. Budget $75–$600 in most cities and confirm whether your contractor pulls it — unpermitted work can block a future home sale.

How long does the job take?

Most residential projects of this type finish in one to five working days once materials are on site. Custom orders, inspections and weather are the usual causes of delay.

How many quotes should I get?

Three. Bids on the same scope commonly vary 20–40%, and the middle bid with the strongest warranty and references is usually the best value — the cheapest bid often excludes prep, disposal or permits.

Home/Cost guides/Sunroom Addition/Billings, MT

Billings metro · Montana

Sunroom Addition cost in Billings, MT

Billings homeowners typically pay $24,500 – $81,600 for sunroom addition. Local labor and materials price 2% above the national average.

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Billings average

$53,000

Typical low

$24,500

Typical high

$81,600

Per square foot

$120 – $410

Sample ZIP

What drives Billings pricing

Local labor

Licensed trade labor in Billings runs about 102% of the national average, and the best crews book out fastest in spring and early summer.

Permits & code

Most Billings, MT projects that change structure, electrical, plumbing or mechanical systems need a permit from the local building department; cosmetic work usually does not.

Climate & conditions

Montana weather drives material choices here, so ask contractors what they install most often in Billings and why.

Instant cost calculator

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Sunroom size (sq ft)200 square feet

Quality / material level

Site access

Removal / prep work

Timing

Estimated project cost

$31,350 – $42,750

Most homeowners pay around $37,050

Compare quality / material level

Cost by material in Billings

Installed Billings pricing per square foot.

Option	Installed cost	Pros	Cons
Three-season kit	$165 – $225	—	—
Four-season prefab	$225 – $295	—	—
Site-built four-season	$295 – $385	—	—
Custom conservatory	$385 – $530	—	—

Where the money goes in Billings

A typical $53,000 Billings project, broken down by line item.

Labor0.45% · $239
Materials0.38% · $201
Permits & inspections0.05% · $27
Overhead & profit0.12% · $64

Common add-ons

Extras that show up on Billings quotes but rarely in the headline price.

Foundation or slab

$3,050 – $12,200

HVAC extension

$1,550 – $6,100

Electrical and lighting

$1,200 – $4,100

Insulated glass upgrade

$2,050 – $9,200

Ways to save in Billings

Choose a three-season room if you only use it spring through fall.
Reuse an existing deck structure if it is rated for the load.
Collect three written bids on an identical scope — spreads of 20–40% are normal.
Book in the off-season and stay flexible on the start date to save 5–15%.
Bundle nearby work into one mobilization so you only pay setup and travel once.
Ask what the contractor would change to cut 10% without hurting durability.

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$1,530 – $4,080

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$18,360 – $96,900

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$5,610 – $18,360

Deck Building in Billings

$4,488 – $12,240

Window Replacement in Billings

$459 – $1,530

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