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Bathroom Addition Cost Calculator — Wilmington DE

Adding a bathroom in Wilmington DE, Delaware costs higher than the national average. Type (half vs. full vs. master), proximity to existing plumbing, and finish level are the biggest cost factors.

Low estimate$5,400
Average$19,400
High estimate$59,400

Bathroom square footage

Bathroom square footage 60

Quality Tier

Standard materials, solid craftsmanship

Scope of Work

Labor

Labor portion of total cost 40%

Bathroom Addition Cost in Wilmington DE: 2026 Guide

Use the calculator above to get a quick estimate. The guide below explains what drives bathroom addition costs in Wilmington DE and what to expect from contractors in Wilmington DE.

Typical Bathroom Addition Costs in Wilmington DE

Project ScopeLowHigh
Half bath (35 sqft, basic fixtures)$1,900$3,500
Full bath (60 sqft, mid-grade)$5,400$16,000
Full bath (80 sqft, tile shower)$16,000$19,400
Master bath (100+ sqft, premium)$19,400$59,400

What Affects Bathroom Addition Costs in Wilmington DE?

Labor rates: Contractors in Wilmington DE charge $49–$97/hour for bathroom addition work — higher than the national average.

Material costs: Material prices in the Northeast region are 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 bathroom addition cost in Wilmington DE?
Adding a bathroom in Wilmington DE costs $5,400–$59,400. A half bath (toilet + sink, ~35 sqft) runs $5,400–$3,500. A full bath (60–80 sqft) costs $3,500–$19,400. A master bath with walk-in shower, double vanity, and premium tile can reach $59,400.
Is adding a bathroom worth it in Wilmington DE?
Adding a bathroom typically returns 50–60% of the cost at resale in Wilmington DE. Homes with only 1 bathroom gain the most value from a second bath. Half bath additions near living areas have the best ROI — typically $10,000–$25,000 added to home value.
How long does bathroom addition take in Wilmington DE?
A half bath addition takes 2–4 weeks. A full bath addition takes 3–6 weeks. A master bath with custom tile work can take 6–10 weeks. In Wilmington DE, allow 2–4 weeks extra for permit approval. Plan for the space to be unusable during construction.
Can I add a bathroom without breaking through walls in Wilmington DE?
If you're converting existing space (large closet, unused room corner) and plumbing lines are accessible, you may minimize wall opening. However, new bathrooms need supply lines, drain lines, and venting — which almost always requires some wall or floor access. A licensed plumber in Wilmington DE can advise on the least invasive approach.

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Estimated cost in Wilmington DE

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Range: $0 – $0
Materials$0
Labor$0
City multiplier1.08x

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