How much does sunroom addition cost in Renton, WA?

Most Renton homeowners spend between $28,800 – $96,000 on sunroom addition, with an average around $62,400. Local labor prices 20% above the national average, so Renton quotes tend to land at the higher end of national ranges.

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

Renton follows the King County labor market. Rain and moss make maintenance a recurring cost.

Do I need a permit for sunroom addition in Renton, Washington?

City permits with critical-areas review in some neighborhoods. 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 Renton?

Get at least three written quotes from licensed, insured Washington contractors. Comparing line items — not just the bottom line — is the fastest way to spot an inflated bid in the Seattle 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/Renton, WA

Seattle · Washington

Sunroom Addition cost in Renton, WA

Renton homeowners typically pay $28,800 – $96,000 for sunroom addition. Local labor and materials price 20% above the national average.

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Renton average

$62,400

Typical low

$28,800

Typical high

$96,000

Per square foot

$145 – $480

Sample ZIP

98055

What drives Renton pricing

Local labor

Renton follows the King County labor market.

Permits & code

City permits with critical-areas review in some neighborhoods.

Climate & conditions

Rain and moss make maintenance a recurring cost.

Instant cost calculator

Adjust the inputs to see live pricing

Sunroom size (sq ft)200 square feet

Quality / material level

Site access

Removal / prep work

Timing

Estimated project cost

$37,050 – $50,350

Most homeowners pay around $43,700

Compare quality / material level

Cost by material in Renton

Installed Renton pricing per square foot.

Option	Installed cost	Pros	Cons
Three-season kit	$195 – $265	—	—
Four-season prefab	$265 – $350	—	—
Site-built four-season	$350 – $450	—	—
Custom conservatory	$450 – $625	—	—

Where the money goes in Renton

A typical $62,400 Renton project, broken down by line item.

Labor0.45% · $281
Materials0.38% · $237
Permits & inspections0.05% · $31
Overhead & profit0.12% · $75

Common add-ons

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

Foundation or slab

$3,600 – $14,400

HVAC extension

$1,800 – $7,200

Electrical and lighting

$1,450 – $4,800

Insulated glass upgrade

$2,400 – $10,800

Ways to save in Renton

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.

Renton FAQs

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More Renton research

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Sunroom Addition cost near Renton

Sunroom Addition cost in Seattle, WA

$30,720 – $102,400

Sunroom Addition cost in Bellevue, WA

$31,680 – $105,600

Sunroom Addition cost in Tacoma, WA

$27,600 – $92,000

Sunroom Addition cost in Everett, WA

$28,320 – $94,400

Sunroom Addition cost in Kent, WA

$28,560 – $95,200

More Washington cities

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Other project costs in Renton

Fence Installation in Renton

$1,800 – $4,800

Roof Replacement in Renton

$10,200 – $40,800

Kitchen Remodel in Renton

$21,600 – $114,000

HVAC Replacement in Renton

$6,600 – $21,600

Deck Building in Renton

$5,280 – $14,400

Window Replacement in Renton

$540 – $1,800

See every Renton cost guide