What It Costs

Small Homes
Sonoma County Typical 640 Sq. Ft. Second Unit
(1 Bedroom, 1 Bath)
Summary Totals
Factory Home Base Price                                       $49,125
Most Popular Upgrades (see details)                $12,465
Transport                                                                      $ 5,625
Permits and Fees (see details)Cost                    $16,728
Installation (see details)                                        $18,875

Totals                                                                               $102,818

 

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Factory Home Cost Plus Most Popular Upgrades
Base Price
Upgrade Option Details
Exteriors
Wildland Urban Interface Fire Package
Lap Siding Throughout
30# Roof
2 x 4 Interior Walls
Prepare for FoundationWindows2″ Mini Blinds
Bathroom WindowKitchenHardwood Doors and Frames
DW, Micro, Disposal, IcemakerUtility Room
Plumb for Washer and Dryer
30 Gas Water Heater
Cabinet over Washer and DryerElectrical
Block and Wire Living Room
Block and Wire Bedroom
Overhead Ceiling Light
Wire for Air Conditioner 

Miscellaneous
R-38,R-19,R-22 Floor Energy Star Insulation

Total Upgrades
Base Price ($46,125) plus upgrades

Cost
($49,125)

$2,500
$3,750
$500
STD
$400

 

$190
$375

$1,900
$1,250

$250
$375
$375

$125
$125
$125
$250

 

$375

 

$12,465
$61,590

Many more options are available. Above lists the most popular.

Sonoma County Second Unit Permits/Fees
PRMD – Permit and Resource Management Department
1. SMIP
2. Building Standards
3. Plan Check
4. Site Review
5. Fire Safety Services
6. Fire Residential Review
7. Building Permit (3)
8. Electrical
9. Plumbing
10. Tech Enhancement Fee
11. Plan Administration Fee
12. Traffic Mitigation Fee determ
13. NPDES
14. Zoning Permit No Design Review
Subtotal [1-14]
15. Sewer Connect County
16. Sewer Connect City
Subtotal [15-16]
17. Park Mitigation
18. Traffic Mitigation
19. School Mitigation
Subtotal [17-19]
Total Fees
Cost
$1
$1
$264
$147
$692
$346
$418
$74
$74
$48
$63
$118
$50
$143
$2,440
$3,356
$2,636
$5,992
$3,165
$3,333
$1,798
$8,296
$16,728

Sonoma County Second Unit Installation Costs
Translift
Grading (Cut Pad)
Foundation
Set Level
Skirting
Interior Close Up
Lay Carpet
Hook Up Sprinkler System
Clean Interior
Hang Lights & Do Punch List
Underground Water Line
Underground Gas Line
Underground Sewer line
Electricity Hook Up
Permit Process
Total
Cost
$0
$1,500
$0
$2,500
$3,750
$0
$0
$0
$0
$0
$2,250
$2,250
$2,250
$2,250
$2,125
$18,875
Those columns with a zero entry will generally be irrelevant to the “Typical” profile for initial price understanding. They have been left here as they are categories that do present in some current projects.
Print/download a PDF of this page: Typical Sonoma County Second Unit Costs
For more info, go to How It Works