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What size addition may I make to my house?
Additions resulting in up to a 45% floor area ratio (FAR) is allowed by right, and only requires the obtainment of building permit. FAR is the amount of living space (not including the garage or basement) divided by the size of the lot. Floor area for the calculation of FAR is measured to the exterior wall surfaces and includes stairwells.

Any new single-family residence that results in a FAR of more than 45% will require a Single-Family House Permit application submittal. For more information on the Single Family House Permit and floor area ratio, please visit our Single-Family House Permit page.

Planning - General Questions

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1. How do I find zoning and General Plan land use information?
2. How tall can my house be?
3. What size addition may I make to my house?
4. What is a Single Family House Permit?
5. Where is my front property line relative to the sidewalk or park strip?
6. I live on a corner lot. Which is the front and which is the side property line?
7. What are the regulations for "accessory buildings" (e.g., garages, sheds, etc.) and "accessory structures" (e.g., gazebos, trellises, arbors, etc.)?
8. May I build a secondary unit or guest house (also called a "granny" or in-law unit)?
9. What are the rules for fences?
10. Do I need a permit to remove a tree?
11. Can I conduct a business from my home?
12. What permits are required for solar panels and photo voltaic (PV) systems?
13. How can I obtain feedback on a development proposal prior to submitting an application?
14. How much are the fees for planning and building permits?
15. Where can I see a sample site plan, building elevation, and floor plan?
16. What is a Legal Nonconforming Use?
17. Where do I find the expiration date of an approved Development Permit?
18. How can I extend the life of an approved Development Permit?
19. Can I reactivate a Development Permit that has expired prior to obtaining a building permit?
20. Where can I find more information on land use planning in San Jose?
21. Where is City Hall?