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228 14th Street, Vallejo, CA 94590
Prepared for: Melissa Wagner
By SideHaus
Summary
The property at 228 14th Street, Vallejo can support a detached one-bedroom ADU. The lot measures approximately 50 ft × 96 ft, which provides enough depth and width for a compact 1-bedroom unit behind the main home.
Installation is generally easy due to the flat terrain, clear backyard, and an existing side access gate that allows equipment to enter without difficulty.
The property is not located in a flood zone or fire zone.
Because the ADU will be under 750 sq ft, there are no impact fees, which keeps the permit cost low.
The property is more than ½ mile from public transit, so one additional onsite parking space is required. This can likely be satisfied by designating the parking pad in front of the home (the portion not leading into the garage) as the ADU’s required parking.
Crane delivery is possible, but the overhead utility lines in front of the home must be temporarily disconnected or lifted. This is a routine process but must be scheduled with utility providers.
Site Overview
A satellite review indicates:
- The backyard has a clear open area suitable for a one-bedroom ADU
- Access for construction equipment is straightforward through the existing side gate
- The main constraint is the overhead utility lines that obstruct crane access, requiring temporary disconnection
Satellite Image
(Will be inserted in the PDF exactly as uploaded — not stretched)
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Property Overview
- Owner: Kelly A. Keller
- Prepared for: Melissa Wagner
- APN: 0057-214-210
- Lot Size: 4,791.6 sq ft (approx. 50′ × 96′)
- Existing Home: 2 bed / 1 bath / 851 sq ft
- Garage: Not listed
- Zoning: Standard Vallejo residential — ADU allowed by right
- Year Built: 1939
ADU Feasibility Summary (Detached)
- Allowed by Right: Yes
- Maximum ADU Size: Typically 1,000–1,200 sq ft depending on zoning
- Proposed ADU Size: One-bedroom only (approx. 430–550 sq ft)
- Why One Bedroom Only:
- The lot width and depth only support a 1BR footprint that meets setbacks, fire separation, and access requirements
- Setbacks:
- 4′ side
- 4′ rear
- Height Limit:
- 16′ (18′ possible with administrative review)
- Parking Requirement:
- Required (property is more than ½ mile from transit)
- Likely satisfied by designating the existing front parking pad
- Sprinklers:
- Not required unless the existing home has them
- Utilities:
- Water and sewer connections available
- Electrical panel may need upgrade depending on load
- Delivery Method:
- Crane delivery requires temporary disconnection of overhead utility lines
- Side yard gate allows equipment access for foundation and finishing
- Design Flexibility:
- ADU does not need to match the main home’s architectural style
Opportunities
- Flat lot makes construction simple
- Easy equipment access through side gate
- Rear yard layout supports privacy
- ADU under 750 sq ft eliminates impact fees (savings of several thousand dollars)
- Efficient installation once utilities are scheduled
Constraints
- Overhead utility lines block crane path and require temporary disconnection
- Lot is compact, limiting ADU to one bedroom
- Parking requirement must be satisfied (front pad is likely acceptable)
- Confirm sewer lateral route before finalizing placement
Permit & Timeline Estimate (City of Vallejo)
Timeline
- 4–8 weeks for city review
- Additional time for revisions or resubmittals
Fee Estimates (for ADU < 750 sq ft)
Impact Fees
- None (state law exemption)
Building Department Fees
- Building Permit: $1,200 – $1,800
- Plan Check: $1,000 – $1,600
- Mechanical/Electrical/Plumbing: $400 – $700
- Tech/Admin Fees: $150 – $300
School Fees
- Charged on all ADUs
- Approx. $3.79 per sq ft
- For a ~500 sq ft ADU: ~$1,900
Utility & Public Works Fees
- Water connection: $500 – $1,200
- Sewer capacity: $1,200 – $2,000
- Optional/conditional:
- Encroachment permit: $350 – $700
Estimated Total Fees (Under 750 sq ft ADU)
~$4,500 – $7,500 all-in
