Room Addition in Minneapolis: How Much Does It Cost to Add Square Footage? 

Room addition costs in Minneapolis vary enormously based on the type, size, and complexity of the addition. Here are current market ranges:

•        Small bump-out addition (50–150 sq ft, expanding a kitchen or dining room): $25,000–$55,000

•        Four-season sunroom (200–300 sq ft, fully insulated): $45,000–$85,000

•        Master suite addition (400–600 sq ft with bath): $100,000–$180,000

•        Second-story addition (full floor above existing): $150,000–$300,000+

•        In-law suite or ADU (500–700 sq ft, kitchen, bath, separate entry): $120,000–$220,000

Several factors drive the final cost of a room addition in Minneapolis:

• Foundation type — slab additions are simpler; crawl space or full basement additions cost more

• Exterior matching — the new addition must match the existing home's siding, roofline, and window style

• Interior finishes — the addition needs to match or improve upon the rest of the home's interior quality

• Seasonal timing — Minneapolis additions started in late summer complete before winter freeze-up

• Permit complexity — the City of Minneapolis requires detailed structural plans for all additions

All room additions in Minneapolis require a building permit. Depending on the neighborhood and lot coverage, your project may also require a zoning variance — particularly in older neighborhoods like Linden Hills, Longfellow, and Northeast Minneapolis where lot sizes are small. Laghmich conducts a preliminary zoning review before every addition project and handles all permit applications.

•        Four-season porches — a staple in Minneapolis, allowing year-round outdoor connection

•        Main-floor primary suites — increasingly popular as Minneapolis homeowners age in place

•        Kitchen bump-outs — expanding tight galley kitchens by 8–12 feet without a full addition

•        Garage conversions with additions — popular in Minneapolis's walkable neighborhoods

A standard room addition in Minneapolis takes 3–6 months from permit approval to completion. The permit process itself takes 4–8 weeks. Starting in spring is ideal to complete the exterior work before Minnesota winter.