How much does a room addition cost in San Diego? Detailed pricing per square foot, by room type, and factors that affect your total cost.
Need more space but love your San Diego neighborhood? A room addition lets you expand without moving. Here's what to budget.
Room Addition Cost Per Square Foot
San Diego room additions typically cost $200-$400 per square foot, depending on complexity:
- Basic addition: $200-$275/sq ft — Simple structure, minimal plumbing
- Mid-range addition: $275-$350/sq ft — Standard finishes, some custom features
- High-end addition: $350-$400+/sq ft — Premium materials, complex design
Costs by Addition Type
Bedroom Addition: $80,000 - $150,000
A 200-400 sq ft bedroom addition with closet. Add $15,000-$30,000 for an attached bathroom (becoming an en-suite).
Family Room Addition: $60,000 - $120,000
200-300 sq ft great room or living space extension. Minimal plumbing keeps costs lower.
Bathroom Addition: $40,000 - $80,000
Adding a bathroom to existing space or as part of an addition. Plumbing complexity drives costs.
Second Story Addition: $150,000 - $350,000
Adding a full second story is major construction but doesn't reduce yard space. Requires structural reinforcement of existing foundation.
Sunroom/Enclosed Patio: $25,000 - $80,000
Three-season rooms cost less; fully conditioned additions cost more.
What Affects Room Addition Costs?
Foundation work: Slab vs. raised foundation impacts cost significantly.
Roofline integration: Matching existing roof adds complexity.
Utilities: Extending HVAC, electrical, and plumbing adds $10,000-$30,000.
Permits: San Diego permits typically $3,000-$8,000.
Lot constraints: Setback requirements may limit addition size.
Room Addition vs. ADU
Consider an ADU instead if you want rental income potential. ADUs can be detached and generate $2,000-$4,000/month.
Explore our home addition services or get a free estimate.
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