Sunroom square footage

Sunroom square footage 200

Quality Tier

Standard materials, solid craftsmanship

Scope of Work

3-season sunroom (screened/basic glass)$73.20/sqft 4-season sunroom (insulated, HVAC)$170.80/sqft Solarium (full glass roof & walls)$244.00/sqft Prefab sunroom kit$9,750 Foundation (slab or piers)$21.96/sqft HVAC mini-split (4-season)$5,500 Electrical (outlets, lighting)$2,200 Interior finishing (flooring, trim)$18.30/sqft Permit & engineering$1,850

Labor

Labor portion of total cost 40%

Sunroom Addition Cost in Fairfax VA: 2026 Guide

Use the calculator above to get a quick estimate. The guide below explains what drives sunroom addition costs in Fairfax VA and what to expect from contractors in Fairfax VA.

Typical Sunroom Addition Costs in Fairfax VA

Project Scope	Low	High
Small 3-season room (100–150 sqft)	$6,400	$12,000
Average 3-season (200 sqft)	$18,400	$45,600
4-season room (200 sqft, insulated)	$45,600	$54,800
Large 4-season / solarium (300+ sqft)	$54,800	$146,400

What Affects Sunroom Addition Costs in Fairfax VA?

Labor rates: Contractors in Fairfax VA charge $55–$110/hour for sunroom addition work — significantly higher than the national average.

Material costs: Material prices in the South region are significantly higher than national average due to local supply, transportation costs, and market demand.

Project complexity: Site conditions, permitting requirements, and non-standard layouts can add 15–30% to total project cost.

Frequently Asked Questions

How much does a sunroom addition cost in Fairfax VA?

Sunroom additions in Fairfax VA cost $18,400–$146,400. A basic 3-season room (200 sqft) runs $18,400–$12,000. A 4-season heated/cooled sunroom costs $12,000–$54,800. A full solarium with glass roof can reach $146,400. Prefab kits start around $8,000–$15,000 but require a prepared foundation.

3-season vs. 4-season sunroom — what's the difference in Fairfax VA?

A 3-season room has screened or thin-glass walls with no HVAC — comfortable spring through fall but unusable in winter in Fairfax VA. A 4-season room has insulated walls, double-pane windows, and a mini-split system — livable year-round and often counts as conditioned square footage, adding more home value.

Does a sunroom add home value in Fairfax VA?

A 4-season sunroom typically returns 50–70% of its cost at resale in Fairfax VA. A well-built sunroom adds livable square footage, improves natural light, and has strong buyer appeal. 3-season rooms return less (30–50%) since they're seasonal.

Do I need a permit for a sunroom in Fairfax VA?

Yes — sunrooms are permanent structure additions and require a building permit in virtually all jurisdictions in Fairfax VA. You'll need architectural drawings for a 4-season room. Processing typically takes 2–6 weeks. Your contractor should handle the permit application.

Create Pro Estimates in 60 Seconds

Use Cost Estimator app to generate detailed sunroom addition estimates — share as PDF directly with clients.

App Store — Free Google Play — Free

Estimated cost in Fairfax VA

Range: $0 – $0

Materials$0

Labor$0

City multiplier1.22x

Sunroom Addition Cost Calculator — Fairfax VA