Additions

Adding-on to Your Home or Business?

Make sure you understand the full scope of your project before you start. Additions can trigger fees, code upgrades and more that can cost money and add time to your project.

Impact Fees

When you add square footage to your property, you will be required to pay fees to cover additional costs borne by the community for that square footage. Sometimes changes in use can also trigger fees.  To learn more, you should check with the Planning Division, 707-778-4470 or [email protected].

Parking

Changes in the use of your property and expansions may trigger additional parking requirements.  Off street parking requirements are established in the Implementing Zoning Ordinance.  You should check with the Planning Division, 707-778-4470 or [email protected].

Code Upgrades

Depending the extent of your remodel, you may need to upgrade your project to meet new codes.  This could include ADA Accessibility, fire, energy, plumbing among others.  The building code will be updated in 2020 and could trigger other requirements.  You will need to make sure you work with your architect and engineer to be sure your project will meet the requirements.

Fire Sprinklers

Often, additions can changes of use will trigger the need to install fire sprinklers.  This is true for residential and commercial projects.  Fire sprinklers add cost and time to your project.  You should be sure you understand your requirements and plan ahead.  You may need to upgrade your water connections as well.

For info about sprinkler requirements, see the Fire Prevention Bureau page or call 707-778-4389.

To find out whether you will need to upgrade your water connection to install fire sprinklers, call 707-778-4546.

Site Plan and Architectural Review (SPAR)

Sometimes Commercial and Residential additions trigger Site Plan and Architectural Review.  For more info go to the SPAR page.

Addition Handouts

NameCategoryDownload
Residential Fire Sprinkler Checklist AdditionsBuilding FormsNew ConstructionPlanning and BuildingRepair, RemodelResidential Building Info DOC (157 KB)
Change in Use or Occupancy Classification AdditionsBuilding FormsCommercial Building RequirementsNew ConstructionPlanning and BuildingRepair, RemodelResidential Building Info PDF (195 KB)
Electric Vehicle Charger Checklist AdditionsCommercial Building RequirementsNew ConstructionPlanning and BuildingRepair, RemodelResidential Building Info PDF (325 KB)
Residential Pool/Spa Information AdditionsBuilding FormsNew ConstructionPlanning and BuildingRepair, RemodelResidential Building Info PDF (291 KB)
Accessory Dwelling & Junior Accessory Dwelling Requirements AdditionsNew ConstructionPlanning and BuildingRepair, RemodelResidential Building Info PDF (250 KB)
As Built Plan Check and Inspections AdditionsBuilding FormsCommercial Building RequirementsNew ConstructionPlanning and BuildingRepair, RemodelResidential Building Info PDF (229 KB)
Resubmittal of Plans Guidelines AdditionsBuilding Department HandoutsBuilding FormsCommercial Building RequirementsNew ConstructionPlanning and BuildingRepair, RemodelResidential Building Info PDF (183 KB)
Permit Extension Request AdditionsBuilding Department HandoutsBuilding FormsCommercial Building RequirementsNew ConstructionPlanning and BuildingRepair, RemodelResidential Building Info PDF (299 KB)
Electronic File Preparation Standards AdditionsBuilding FormsCommercial Building RequirementsNew ConstructionPlanning and BuildingRepair, RemodelResidential Building Info PDF (268 KB)
Residential Replacement Windows AdditionsBuilding Department HandoutsBuilding FormsNew ConstructionPlanning and BuildingRepair, RemodelResidential Building Info PDF (260 KB)
Solar PV Storage Battery Requirements AdditionsBuilding Department HandoutsBuilding FormsNew ConstructionPlanning and BuildingRepair, RemodelResidential Building Info PDF (221 KB)
CALGreen Building Design and Construction Verification AdditionsCommercial Building RequirementsNew ConstructionPlanning and BuildingRepair, RemodelResidential Building Info PDF (238 KB)
Variance Application Checklist AdditionsNew ConstructionPlanning Division Forms PDF (221 KB)
Specific Plan/Zoning Amendment Application Checklist AdditionsNew ConstructionPlanning Division FormsProperty Uses PDF (172 KB)
Lot Line Adjustment/Merger Application Checklist AdditionsNew ConstructionPlanning Division FormsResidential Building Info PDF (196 KB)
General Plan Amendment Application Checklist AdditionsNew ConstructionPlanning Division FormsProperty Uses PDF (210 KB)
Building Height Calculation Handout AdditionsCommercial Building RequirementsNew ConstructionPlanning Division FormsResidential Building Info PDF (166 KB)
Address Change Application Form AdditionsNew ConstructionPlanning Division Forms PDF (66 KB)
Water Use Efficiency Improvements AdditionsBuilding FormsCommercial Building RequirementsInstallationsNew ConstructionPlanning and BuildingRepair, RemodelResidential Building Info PDF (258 KB)
Tankless Water Heater Information AdditionsBuilding FormsInstallationsNew ConstructionPlanning and BuildingRepair, RemodelResidential Building Info PDF (212 KB)
Special Inspector Application AdditionsBuilding FormsCommercial Building RequirementsInstallationsNew ConstructionPlanning and BuildingRepair, Remodel PDF (196 KB)
Soils Report Information AdditionsBuilding FormsCommercial Building RequirementsInstallationsLandscaping & TreesNew ConstructionPlanning and BuildingResidential Building Info PDF (208 KB)
Smoke Alarm Location & Info – Residential AdditionsBuilding FormsCommercial Building RequirementsFire PreventionNew ConstructionPlanning and BuildingRepair, RemodelStorage PDF (270 KB)
Smoke & Carbon Monoxide Alarm Self Verification Form AdditionsBuilding FormsFire PreventionInstallationsNew ConstructionPlanning and BuildingRepair, RemodelResidential Building Info PDF (227 KB)
Site Plan Sample AdditionsBuilding FormsCommercial Building RequirementsLandscaping & TreesNew ConstructionPlanning and BuildingResidential Building Info PDF (72 KB)
Lighting Standards – Residential AdditionsBuilding FormsNew ConstructionPlanning and BuildingRepair, RemodelResidential Building Info PDF (4.2 MB)
Solar Photovoltaic Requirements AdditionsCommercial Building RequirementsInstallationsNew ConstructionPlanning and BuildingRepair, RemodelResidential Building Info PDF (254 KB)
PEX Use Requirements AdditionsBuilding FormsCommercial Building RequirementsInstallationsNew ConstructionPlanning and BuildingRepair, Remodel PDF (206 KB)
Impact and Capacity Fee Refund AdditionsBuilding FormsNew ConstructionPlanning and Building PDF (101 KB)
Lead Abatement Information AdditionsBuilding FormsPlanning and BuildingRepair, RemodelResidential Building Info PDF (472 KB)
Cool Roofs Requirements AdditionsBuilding FormsCommercial Building RequirementsNew ConstructionPlanning and BuildingRepair, RemodelResidential Building Info PDF (228 KB)
Permit Checklist – Commercial AdditionsBuilding FormsCommercial Building RequirementsInstallationsNew ConstructionPlanning and BuildingRepair, Remodel PDF (206 KB)
Grading & Drainage Info – Commercial AdditionsBuilding FormsCommercial Building RequirementsInstallationsNew ConstructionPlanning and BuildingRepair, Remodel PDF (220 KB)
Handrail Info – Commercial AdditionsBuilding FormsCommercial Building RequirementsInstallationsNew ConstructionPlanning and BuildingRepair, Remodel PDF (253 KB)
Parcel or Subdivision Checklist AdditionsNew ConstructionPlanning and Building PDF (448 KB)
SPAR Trash Enclosure Standards AdditionsNew ConstructionPlanning and BuildingRepair, Remodel PDF (309 KB)
SPAR Parking Standards AdditionsNew ConstructionPermit Application FormsPlanning and Building PDF (477 KB)
SPAR Checklist AdditionsNew ConstructionPermit Application FormsPlanning and Building PDF (274 KB)
Sewer Lateral Replacement Application AdditionsPublic WorksRepair, Remodel PDF (242 KB)
Cost Recovery Form AdditionsLandscaping & TreesNew ConstructionPlanning Division FormsProperty Uses PDF (178 KB)
Planning General Application AdditionsNew ConstructionPermit Application FormsPlanning and BuildingProperty Uses PDF (160 KB)
Special Inspection and Testing Procedure AdditionsBuilding FormsCommercial Building RequirementsInstallationsNew ConstructionPlanning and BuildingRepair, Remodel PDF (366 KB)
Special Inspection Approved Agencies AdditionsBuilding FormsCommercial Building RequirementsInstallationsNew ConstructionPlanning and BuildingRepair, Remodel PDF (130 KB)
Construction Drawings General Information AdditionsBuilding Department HandoutsBuilding FormsCommercial Building RequirementsInstallationsLandscaping & TreesNew ConstructionPlanning and BuildingRepair, RemodelResidential Building InfosignsStarting a Business PDF (226 KB)
Construction Waste Management Form AdditionsBuilding Department HandoutsBuilding FormsCommercial Building RequirementsFormsNew ConstructionPlanning and BuildingRepair, RemodelResidential Building Info PDF (357 KB)
Permit Checklist – Residential AdditionsBuilding FormsNew ConstructionPlanning and BuildingRepair, RemodelResidential Building Info PDF (223 KB)
Addition/Remodel Info – Residential AdditionsBuilding FormsPlanning and BuildingRepair, RemodelResidential Building Info PDF (245 KB)
Retaining Wall Detail – Standard AdditionsBuilding FormsLandscaping & TreesNew ConstructionPlanning and BuildingRepair, RemodelResidential Building Info PDF (257 KB)
Handrail and Stairs Info – Residential AdditionsBuilding FormsNew ConstructionPlanning and BuildingRepair, RemodelResidential Building Info PDF (426 KB)
Fee Information AdditionsBuilding FormsNew ConstructionPlanning and BuildingResidential Building Info PDF (212 KB)
Sea/Land (Containers) Cargo Boxes Used as Storage Buildings AdditionsBuilding FormsCommercial Building RequirementsPlanning and BuildingResidential Building Info PDF (227 KB)
Grading & Drainage Info – Residential AdditionsBuilding FormsLandscaping & TreesNew ConstructionPlanning and BuildingResidential Building Info PDF (227 KB)
Gas Pressure Tests – Information AdditionsBuilding FormsInstallationsNew ConstructionPlanning and BuildingRepair, RemodelResidential Building Info PDF (218 KB)
Garage and Carport Construction Information AdditionsBuilding FormsNew ConstructionPlanning and BuildingResidential Building Info PDF (234 KB)
Construction Info – Residential AdditionsBuilding FormsNew ConstructionPlanning and BuildingRepair, Remodel PDF (289 KB)
Foundation Work Information Handout AdditionsBuilding FormsNew ConstructionPlanning and BuildingResidential Building Info PDF (203 KB)
Carbon Monoxide Alarms AdditionsBuilding FormsFire PreventionNew ConstructionPlanning and BuildingResidential Building Info PDF (217 KB)
How to Get a Building Permit AdditionsBuilding Department HandoutsBuilding FormsCommercial Building RequirementsInstallationsNew ConstructionPlanning and BuildingRepair, RemodelResidential Building Info PDF (235 KB)
Guidelines for Plan Organization and Sheet Identification AdditionsBuilding FormsCommercial Building RequirementsInstallationsLandscaping & TreesNew ConstructionPlanning and BuildingRepair, RemodelResidential Building Info PDF (117 KB)
Planning Fee Schedule AdditionsBuilding Department HandoutsLandscaping & TreesNew ConstructionPlanning and BuildingPlanning Division FormsProperty UsesRepair, RemodelShort Term Rentals PDF (186 KB)
Unreasonable Hardship Application AdditionsCommercial Building RequirementsNew ConstructionPlanning and BuildingRepair, RemodelResidential Building Info PDF (260 KB)
Building Permit Supplemental Application-Owner/Builder (required) AdditionsBuilding ApplicationsBuilding Department HandoutsBuilding FormsInstallationsNew ConstructionPermit Application FormsRepair, RemodelResidential Building Info PDF (319 KB)
Building Permit Supplemental Application-Contractor (required) AdditionsBuilding ApplicationsBuilding FormsCommercial Building RequirementsInstallationsLandscaping & TreesNew ConstructionPermit Application FormsRepair, Remodel PDF (299 KB)
photo of house deck addition


Be sure to get all the permits you need before you start your project.  Some projects may trigger fees are upgrades that may increase costs.

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