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ADU Permit Services in the Bay Area
Hamilton Exteriors provides ADU permit services. We coordinate the drawings, consultant documents, application, correction responses, and approved permit set. Serving the Bay Area and Northern California.
500+ projects
Since 2018
Limited Lifetime
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Responsive from consultation through project closeout
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An ADU permit package must describe one buildable project across every document. The site plan, floor plans, elevations, sections, structural work, energy forms, and building systems need matching dimensions and details before agency review.
We begin with property records and measured conditions. Setbacks, easements, utility locations, access, fire conditions, and the proposed ADU type determine which drawings and consultant documents the application needs.
Plan-check comments rarely affect only one ADU sheet. A changed setback, opening, beam, utility route, or energy detail can require matching revisions across several documents. This service covers permit coordination and correction responses. It does not promise agency approval or replace construction work that begins after the permit is issued.
How We Prepare an ADU Permit Package
Each step turns the proposed ADU into a coordinated agency submission.
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Confirm Property and Project Facts
We review records, measured conditions, the ADU type, setbacks, access, utilities, and any required supporting reports.
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Coordinate the Permit Documents
Architecture, structural work, energy forms, site information, and building-system details are checked as one package.
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Manage Submission and Plan Check
We submit the application, track agency comments, coordinate revisions, and prepare responses through the approved permit set.
ADU Permit Package Check
| Document | What It Shows | Coordination Need |
|---|---|---|
| Site plan | Property lines, buildings, setbacks, access, and utilities | Matches survey and project placement |
| Architectural plans | Rooms, dimensions, elevations, sections, and details | Matches structure and building systems |
| Structural set | Foundation, framing, load path, and connections | Matches architectural dimensions |
| Energy documents | Envelope and equipment assumptions | Matches product and system schedules |
| Plan-check response | Revisions and answers to agency comments | Updates every affected sheet |
Start With Reliable Property Information
Permit drawings depend on the site. Property lines, easements, setbacks, existing buildings, utilities, trees, and access can affect the ADU location. We confirm what information exists and identify any survey or field work needed before the package advances.
Make Every Document Describe the Same ADU
A floor-plan change can affect structural calculations, energy forms, elevations, and utility layouts. We coordinate these documents as one package. Consistent dimensions and notes help reviewers understand the project and reduce avoidable conflicts during construction.
Answer Plan Check as a Coordinated Team
Agency comments can touch several disciplines at once. We organize each comment, coordinate revisions, and check the updated package before resubmission. The goal is a clear response record and one approved set for the field.
ADU Permit Financing Options
ADU permit costs can include site documentation, architecture, structural coordination, energy documents, application work, and plan-check responses. For eligible design-build projects, financing is available with approved credit and may cover qualified design and construction costs. Standalone permit work may not qualify. During your consultation, we explain available terms and eligible project costs.
Ask whether your ADU design-build project qualifies for financing.
Call Now (650) 977-3351 ADU Permit Reviews
Verified public reviews from homeowners who hired Hamilton Exteriors.
Yaku Escobar
via Google
We worked with Hamilton Exteriors to build a small ADU in our backyard. from the beginning the process felt organized and clear. Alex Lee was very responsive and always kept us in the loop, especially during planning and inspections. The crew was consistent and respectful of the space which we appreciated since we were living there during the build. overall everything moved pretty smoothly and the final result looks exactly like what we had in mind. really happy with how it turned out.
Rafa Simons
via Google
My family hired Hamilton after seeing the neigbours new ADU, the whole team were super organized and tecnological and also very patient to undestand my needs before starting the construction. But what i like the best is that they are really preocupated with the final result and they kept us well inform with details and everything. Definitely recomend them.
H.T.
via Google
I had a great experience working with Hamilton exteriors. From start to finish, their team was professional, responsive, and detail-oriented. They made the entire process smooth and stress-free, keeping me updated every step of the way. The quality of their work really stands out. Everything was done efficiently and exceeded my expectations. If you’re looking for a reliable company that takes pride in what they do, I highly recommend them!
Jessica W.
via BBB
The team was professional, communicative, and completed the job in a timely manner. They kept me informed throughout the entire process and arrived as scheduled. The work was well supervised, and the crew paid close attention to every detail. They left the property clean and organized when the job was finished. Overall, the entire experience was smooth, stress-free, and exceeded my expectations. I would definitely recommend their services to others.
Frequently Asked Questions
Didn't find the answer to your question? Call Now (650) 977-3351
What is included in an ADU permit package?
The package can include a site plan, floor plans, elevations, sections, structural documents, energy forms, and key building-system details. The ADU type, property, and agency determine the final document list.
What information do you need before preparing ADU permit plans?
We need the property address, proposed use, target size, known records, and access to measure the site. A survey, title report, prior plans, or utility information can help when available.
Who responds when the agency requests corrections?
We organize the comments, assign each response to the correct designer or consultant, update affected sheets, and submit a coordinated reply. Some comments require homeowner choices before revisions can continue.
Can you permit an ADU that another designer started?
We first review the existing files, ownership rights, measurements, consultant work, and agency history. If the documents are usable, we define the remaining scope. Incomplete or conflicting plans can require measured redrawing.
Does permit approval include permission to start every task?
The approved building permit controls the main construction scope. Utility, public works, fire, or other approvals can also apply. We identify the required approvals during permit planning and confirm them before construction starts.
What can delay an ADU permit review?
Missing property information, survey needs, conflicting drawings, easements, utility questions, fire access, and incomplete correction responses can add review cycles. A coordinated package reduces avoidable comments but cannot control agency timing.
Get Your ADU Permits Quote
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