Our Services
Additions in Wilmington, DE
Add the space your family deserves. Second stories, in-law suites, sunrooms and full-scale additions built to blend seamlessly with your existing home.
What's included
- Second-story additions
- In-law suites & ADUs
- Sunrooms & bump-outs
- Garage conversions
- Permit & engineering coordination
- Roof tie-ins & HVAC extension
Our 4-step process
- 01
Free Estimate
We meet at your home, listen to your vision, and provide a clear written quote.
- 02
Design & Plan
We finalize materials, scope, timeline, and pull all required permits.
- 03
Build
Our crew shows up on time, cleans up daily, and keeps you updated weekly.
- 04
Walkthrough
Final inspection together, punch list completed, written workmanship warranty.
Typical pricing
Every estimate is written, itemized, and free. Final pricing depends on scope, materials, and site conditions.
Frequently asked questions
How much does a home addition cost in Wilmington, DE?
Home additions in Wilmington typically run $40,000 for a small bump-out to $250,000+ for a second-story or in-law suite. Cost depends on foundation work, roof tie-ins, HVAC extensions, and finish level. Every estimate is written and itemized.
How long does an addition take?
Most additions take 4–8 months from signed contract to final walkthrough. Design and engineering 4–6 weeks, permits 4–8 weeks, foundation 2–3 weeks, framing through finishes 3–5 months.
Do I need a permit and engineering for an addition?
Yes, additions require a building permit, structural engineering, and county or municipal inspections. Zavala & Sons coordinates the architect, engineer, and permit office for you so you don't chase paperwork.
Are you licensed and insured?
Yes. Zavala & Sons holds a Delaware business license, full general liability insurance, and workers compensation coverage. We provide a current Certificate of Insurance on request.
Request a free additions estimate
We respond within 1 business day.
Local service area
Additions near you
We build in cities across Delaware, Pennsylvania, Maryland and New Jersey. Pick yours for local details.