Garage Addition Or Remodel costs
Compare the project, repair and planning references below before choosing the work for your property. Confirm measurements, existing conditions and the services included in each proposal.
Cost scope: Benchmarks were reviewed October 24, 2026. Figures apply to the scope and market named by each reference. City/state examples outside Portland Metro are not Portland quotes. Labor, equipment, recurring expenses and complete projects are different budgets.
Installation and project costs
Compare alternatives separately. A range includes installation only when its scope says so. Do not add overlapping totals together.
| Project or reference | Published benchmark | Basis and scope |
|---|---|---|
| Prefab / modular garage prices | $11,000 – $37,500 | total (with foundation & assembly) |
| Cost to build a garage — Garage construction | $15,000 – $80,000 | project varies by size/type |
| Cost to build a garage — Two-car garage | $25,000 – $60,000 | construction total |
| Detached garage cost | $50 – $100 | per sq ft |
| Detached garage cost | $20,000 – $57,600 | total (2-car garage) |
| Cost to build a garage with apartment | $200 – $350 | per sq ft |
| Cost to build a garage with apartment | $80,000 – $300,000 | total |
| Garage extension cost | $60 – $120 | to extend per sq ft |
| Garage extension cost | $9,600 – $24,000 | to add another bay / stall |
Related RemodelRates cost guides
- Prefab / modular garage prices
- Cost to build a garage
- Detached garage cost
- Cost to build a garage with apartment
- Garage extension cost
Explore the related RemodelRates guides for project benchmarks and planning details.
Before requesting bids
Share measurements, photos, location, existing conditions and the desired result. Ask for a written scope covering preparation, permits, removal, material specifications, installation, disposal and finish repairs where relevant. Compare bids using the same quantities and exclusions.
Material cost
Purchase-only prices below are not complete installed totals. Confirm quantities, delivery and product specifications. Do not add these to totals already including materials.
| Project or reference | Published benchmark | Basis and scope |
|---|---|---|
| Prefab / modular garage prices | $18 – $45 | per sq ft (unit only) |
| Prefab / modular garage prices | $7,200 – $26,000 | 2-car garage (unit only) |