ADU Costs Estimates for General Construction

Estimate the Cost of Building an ADU

This budget list is derived from multiple construction budgeting spreadsheet suggestions and several moments of research by IE CLT staff.

Building Permits

Many and varied . . . but these costs are covered by the CalHFA ADU grant. Go ahead and the costs here and later in the form the costs will be accounted for in the CalHFA Grant section. Click here for a PDF that list the fees from the City of Riverside The fees are listed on pages 3 and 4.

Property Survey

A simple property survey can cost anywhere from $100 to $600. These costs are also covered by the CalHFA ADU grant. Add the costs here and later in the form the costs will be acounted for in the CalHFA Grant section.

Architectural Drawings and Site Plan

Many and varied . . . but these costs are covered by the CalHFA ADU grant. Go ahead and the costs here and later in the form the costs will be accounted for in the CalHFA Grant section. Click here for a PDF that list the fees from the City of Riverside The fees are listed on pages 3 and 4.

Stamped Structural Engineering Drawings

Soil Tests

Impact Fees

Energy Report

Insurance - bonds

Electrical Hookup

These costs are covered by the CalHFA ADU grant. Add the costs here and later in the form the costs will be accounted for in the CalHFA Grant section. Water hookup costs anywhere from $50 to $250 per linear foot depending on how hard it is to dig.

Water Hookup

These costs are also covered by the CalHFA ADU grant. Water hookup costs anywhere from $50 to $250 per linear foot depending on how hard it is to dig.

Sewage Hookup

These costs are also covered by the CalHFA ADU grant. Sewage hookups costs $1,400 on average, with a typical range of $530 and $2,279.

Site Preparation

Excavation, grading and backfill run about $15 per square foot. While land with light vegetation and a low slope averages between $3 and $6 per square foot.

Footings and Foundation

Footings run from $3 to $7 per square foot. If your land is flat and easy to dig in, estimate closer to $3 and if you live on the steep side of an active volcano, estimate closer to $7.

Basement

A poured concrete basement averages aproximatly $20,000 added to the cost of the footing.

Decks and Porches

Decks and Porches run about $6,500 - $10,000 but it can be a lot more depending on size and materials.

Windows, Doors and Flashing

Windows ($200 - $500 each), Doors ($500 - $800 each) and the flashing material for the doors and windows add another $200. A good range is $5,000 to $16,000 depending on the number and quality.

Bricks, stone or Dirt for Masonry Walls

$6,500 - $10,000

Lumber for Wood Framed Walls

$6,500 - $10,000

Framing nails, hand nails, glues, screws, sill seal, window door flashing material, general blocking and fire blocking material.

$2,000 to $3,000.

Siding and Exterior Trim

$6,500 - $10,000

Interior Drywall or Plaster

$6,500 - $10,000

Floor Material

Carpet $1,600 to $6,800, Hardwood $6,000 to $12,000, Fake Hardwood Laminate flooring would cost $1400 to $3,400 and Tile would be $6,000 to $9,000

Fireplace and or Stove Inserts

$6,500 - $10,000

Roofing, Flashing and Ventilation

$6,500 - $10,000

Gutters and Downspouts

$6,500 - $10,000

HVAC - heating, ventilation, and air conditioning

$5,000 to $12,000 depending on SEER rating and the amount of ductwork. A 900 sf A frame is going to be closer to $6,000.

Installed Appliances

Appliances can run between $3,500 to $15,000 depending on the price of the appliances.

Plumbing Rough and Finished with Fixtures

$6,500 - $10,000

Electrical Wiring and Electrical fixtures

$3,500 - $6,000

Kitchen Cabinets

Arround $1,000

Interior and Exterior Painting

$2,000 to $6,000

Landscaping and Irrigation

$3,000 – $15,950

Site Cleanup

$3,000 – $15,950

Total Building Materials and Labor Estimate: 0

This total is a rough estimate that should give you a good idea on how much it would cost to build an ADU. The CalHFA ADU Grant will cover some costs if you are qualified (Household Income is less than $173,000 a year and you use one of CalHFA's approved lenders).

CalHFA Grant Covered Costs: 0

Total Construction Estamation 0

ADU Costs Estimates for General Construction

This budget list is derived from multiple construction budgeting spreadsheet suggestions and several moments of research by IE CLT staff.

Many and varied . . . but these costs are covered by the CalHFA ADU grant. Go ahead and the costs here and later in the form the costs will be accounted for in the CalHFA Grant section. Click here for a PDF that list the fees from the City of Riverside The fees are listed on pages 3 and 4.

A simple property survey can cost anywhere from $100 to $600. These costs are also covered by the CalHFA ADU grant. Add the costs here and later in the form the costs will be acounted for in the CalHFA Grant section.

Many and varied . . . but these costs are covered by the CalHFA ADU grant. Go ahead and the costs here and later in the form the costs will be accounted for in the CalHFA Grant section. Click here for a PDF that list the fees from the City of Riverside The fees are listed on pages 3 and 4.

These costs are covered by the CalHFA ADU grant. Add the costs here and later in the form the costs will be accounted for in the CalHFA Grant section. Water hookup costs anywhere from $50 to $250 per linear foot depending on how hard it is to dig.

These costs are also covered by the CalHFA ADU grant. Water hookup costs anywhere from $50 to $250 per linear foot depending on how hard it is to dig.

These costs are also covered by the CalHFA ADU grant. Sewage hookups costs $1,400 on average, with a typical range of $530 and $2,279.

Excavation, grading and backfill run about $15 per square foot. While land with light vegetation and a low slope averages between $3 and $6 per square foot.

Footings run from $3 to $7 per square foot. If your land is flat and easy to dig in, estimate closer to $3 and if you live on the steep side of an active volcano, estimate closer to $7.

A poured concrete basement averages aproximatly $20,000 added to the cost of the footing.

Decks and Porches run about $6,500 - $10,000 but it can be a lot more depending on size and materials.

Windows ($200 - $500 each), Doors ($500 - $800 each) and the flashing material for the doors and windows add another $200. A good range is $5,000 to $16,000 depending on the number and quality.

$2,000 to $3,000.

Carpet $1,600 to $6,800, Hardwood $6,000 to $12,000, Fake Hardwood Laminate flooring would cost $1400 to $3,400 and Tile would be $6,000 to $9,000

$5,000 to $12,000 depending on SEER rating and the amount of ductwork. A 900 sf A frame is going to be closer to $6,000.

Appliances can run between $3,500 to $15,000 depending on the price of the appliances.

Arround $1,000

$3,000 – $15,950

$3,000 – $15,950

You can use the Total Construction Estimation total above to estimate monthly loan payments.