- ADDITION & GARAGE SITE PLAN DRAFTING
Addition & Garage Site Plans for California Properties
Planning a home addition, new garage, carport, workshop, or other accessory structure starts with understanding how the proposed improvement fits on the property.
SitePlan California prepares addition and garage site plans throughout California for homeowners, contractors, builders, architects, developers, permit expediters, property managers, and real-estate professionals — built around the actual property and project information, not a one-size-fits-all template.
- 10+ years of experience
- California statewide
- Residential + commercial
- Professional CAD drafting
Property-Specific
Plans are built around the actual ADU configuration and property provided.
Permit-Focused
Existing and proposed conditions are organized for review and coordination.
Statewide
Remote drafting support for ADU and JADU properties throughout California.
Revision Support
Applicable drafting corrections can be addressed within the agreed scope.
- WHAT IS AN ADDITION OR GARAGE SITE PLAN?
A Scaled Drawing of the Existing Site and Proposed Improvement
An addition or garage site plan is a scaled property drawing showing the existing site and the proposed improvement. For a home addition, that usually means identifying the existing residence and clearly showing the new building footprint that will increase the size of the structure.
For a detached garage, the drawing needs to show where the new accessory structure sits in relation to the house, property lines, driveway, other buildings, and relevant site features.
Each city or county controls its own submittal process within the applicable California building and planning framework. The site plan needs to respond to the actual project and reviewing jurisdiction, not simply copy a drawing from another property.
- WHAT THE SITE PLAN MAY INCLUDE
The Details That Explain Your
Addition or Garage Project
The exact contents depend on the property and permit scope. Good permit drafting is about clarity and coordination, not visual clutter.
01
Property Boundaries
Lot lines and available parcel dimensions, shown from appropriate source information.
02
Existing Residence Footprint
The current house and structures, so the reviewer understands what exists today.
03
Proposed Addition / Garage
The new footprint or structure, clearly distinguished from existing conditions.
04
Setbacks & Distances
Relevant front, side, and rear setbacks and distances between buildings.
05
Access & Driveways
Driveways, vehicle access, and walkways affecting the project.
06
Easements & Utilities
Known easements or utility locations documented when supplied or available.
07
Lot Coverage
Existing and proposed coverage information when part of the permit scope.
08
North Arrow & Scale
Plans organized so orientation, scale, dimensions, and labels are easy to read.
09
Demolition & Notes
Demolition areas when applicable, plus notes explaining the scope of work.
- HOME ADDITION SITE PLANS
Rear, Side, Front &
Second-Story Additions
A home addition changes the footprint of an existing building. Even when the architectural design inside the new space is straightforward, the permit team still needs to understand where the enlarged structure sits on the lot.
Rear Additions
Common because many properties have usable yard area behind the residence — but usable space doesn’t automatically mean an addition will fit without further review.
The site plan should clearly show how far the proposed expansion extends from the existing residence and how the finished footprint relates to the lot.
Side Additions
Can require particularly careful presentation because the distance to the side property boundary may be limited. General drafting should not be represented as a replacement for a professional land survey.
If you already have a survey, include it — if not, we can identify whether additional verified information may be necessary.
Front Additions
Adding floor area toward the front can affect the relationship between the residence, street, front boundary, driveway, and entry areas.
Front-yard projects may also be affected by local planning or zoning requirements, with the reviewing jurisdiction as the final authority.
Second-Story Additions
May not substantially change the ground-level footprint, but the project can still require a site plan as part of the overall permit package.
The site plan provides property context while elevations, floor plans, and structural documentation explain the vertical work.
-CARPORT, WORKSHOP & ACCESSORY STRUCTURES
Site Plans Beyond Garages
Garages are not the only accessory structures that may require property documentation.
Carports
Affects usable driveway area, required setbacks, and access — its location still needs to be communicated clearly.
Workshops
Creates many of the same site-planning questions as a garage: footprint, boundary distance, relationship to the residence, and access.
Storage Buildings & Sheds
Permit requirements vary by size, location, use, and jurisdiction — we document the structure's proposed location within the property.
Other Accessory Structures
Send us the property address and intended use, and we'll review whether it fits within our general drafting scope.
- WHY PLANS GET PERMIT CORRECTIONS
Most Corrections Trace Back
to Missing or Unclear Information
A permit correction does not always mean the project itself is unacceptable — sometimes the drawing simply does not communicate enough information. Missing setbacks and an incomplete existing property layout are common causes.
Dimension conflicts are another problem: if the architectural floor plan shows a 20-foot addition while the site plan shows a different footprint, the project set becomes internally inconsistent.
- Clearly separate existing conditions from the proposed addition or garage
- Match dimensions across the site plan and architectural floor plan
- Show setbacks using appropriate, sourced property information
- Document every existing structure that affects usable site area
- Account for easements before they surface as a correction
- Coordinate demolition work with the proposed site plan
- OUR PROCESS
From Property Address to Permit-Ready Drafting
Step 1
Send the Property Address
Tell us whether the project is a home addition, attached or detached garage, carport, workshop, shed, or another structure.
Step 2
Provide Available Information
Survey, existing site plan, architectural drawings, photos, measurements, sketches, or permit correction comments — send what you have.
Step 3
Property & Scope Review
We review the information to identify what can be drafted reliably and whether additional documentation is needed.
Step 4
Existing & Proposed CAD Drafting
The existing condition is organized first, then the proposed addition, garage, or structure is clearly distinguished.
Step 5
Client Review
You confirm practical property details — sheds, patios, fences, or driveway changes that public records may miss.
Step 6
Revisions & Final Delivery
Applicable corrections are incorporated and final PDF and CAD/DWG files are delivered per the agreed scope.
- WHAT WE NEED TO GET STARTED
Request a Quote Without a
Complete Permit Package
You can request a quote even if you don’t have every document ready. At minimum, send us the following.
A
Property Address
Lets us identify the project location.
B
Project Type
Addition, garage, carport, workshop, shed, or another improvement.
C
Approximate Project Size
Proposed dimensions, if known.
D
Project Location
Whether the improvement is at the front, side, or rear of the property.
- EXISTING VS. PROPOSED CONDITIONS
A Clear Baseline, Then a Clear Change
One of the most important presentation choices on an addition or garage site plan is the distinction between the current property and the proposed project. An existing-condition drawing establishes the baseline; the proposed plan then shows the change.
This existing-versus-proposed approach makes it easier for a reviewer to understand the project without interpreting complicated overlays.
- WHO WE WORK WITH
Contractors, Builders & Architects
Contractors may already know the construction scope but need the property information organized into a clean permit drawing. Architects or designers may need a site-plan base that coordinates with floor plans and elevations. Permit expediters may need an updated drawing after correction comments.
We work from architect markups, contractor sketches, existing CAD files, surveys, client measurements, permit comments, and proposed dimensions.
- GET A FREE QUOTE
Tell Us About Your Addition or Garage Project
Tell us about the property and proposed addition, garage, or accessory structure. If you already have a survey, drawings, dimensions, photos, or permit comments, include that information with your request.
10+ Years
Addition & garage drafting
California
Statewide project support
Res + Comm
Flexible project capability
- ADDITION GARAGE SITE PLAN DRAFTING
Request Your Free Quote
- DELIVERABLES
What You Can Expect From the Drafting Scope
Your deliverables depend on the selected scope. A typical project may include an existing site plan showing the current property configuration, a proposed site plan showing the addition, garage, or accessory structure, a clean permit PDF suitable for coordination with the larger permit package, and CAD/DWG files when included in the agreed scope.
We keep the scope clear before drafting begins — that prevents confusion about whether architectural, structural, civil, survey, energy, or other separately required professional documents are included.
SitePlan California provides addition and garage site-plan and drafting services. Some projects require a licensed architect, professional engineer, civil engineer, land surveyor, geotechnical consultant, or other licensed professional. A drafting service does not replace those professional requirements when a jurisdiction or project scope requires them.
- ADDITION & GARAGE SITE PLAN FAQS
Common Questions About Addition & Garage Site Plans
Do I need a site plan for a home addition in California?
A site plan is commonly required as part of a residential addition permit package because the reviewing authority needs to understand where the addition is located on the property. Exact requirements depend on the local city or county.
Can you prepare a site plan for a detached garage?
Yes. We can prepare existing and proposed site-plan documentation for detached garages using the available property information, proposed dimensions, and applicable project documents.
Can you prepare a site plan for an attached garage?
Yes. An attached garage can be shown as an expansion of the existing building footprint, together with relevant property relationships and project dimensions.
Do you prepare plans for carports and workshops?
Yes. Carports, workshops, sheds, storage structures, and similar accessory improvements can be reviewed as part of our site-plan drafting services.
Do I need a survey before you can prepare the site plan?
Not every project begins with a survey. However, if accurate boundary, easement, elevation, or topographic information is critical, a licensed survey or other verified professional information may be required.
Can you show setbacks on the site plan?
Yes, relevant setback dimensions can be shown where the appropriate property and project information is available. Required setbacks are determined by the applicable jurisdiction and project conditions.
Can you calculate lot coverage?
Lot-coverage information can be included when it forms part of the agreed scope and sufficient property and building dimensions are available.
Can you revise my plan after city comments?
Yes. Send the complete written correction comments and we can address applicable site-plan drafting items within the agreed scope.
Does the site plan include structural engineering?
No. General site-plan drafting is different from structural engineering. Structural calculations or stamped professional documents must be handled by the appropriate licensed professional unless separately included.
Can you prepare site plans throughout California?
Yes. SitePlan California provides remote drafting support throughout California. Local permit requirements vary, so each project is reviewed against the applicable city or county requirements.
- Start Your Permit Site Plan
Start Your Addition or Garage Site Plan
Send us the property address, proposed project dimensions, and any drawings or property information you already have. We’ll review the project and help determine the appropriate site-plan drafting scope.