Home Addition Construction Cost AltadenaHome Addition Construction Cost AltadenaHome Addition Construction Cost AltadenaHome Addition Construction Cost AltadenaHome Addition Construction Cost AltadenaHome Addition Construction Cost AltadenaHome Addition Construction Cost AltadenaHome Addition Construction Cost AltadenaHome Addition Construction Cost AltadenaHome Addition Construction Cost Altadena

Home Addition Construction Cost in Altadena, CA

Detailed pricing guide with local market adjustments and material comparisons

Altadena Average

$34,000–$127,500

Market Tier

Small City

Cost Breakdown

Home Addition Construction Cost in Altadena

Small City

LowAverageHigh

$34,000$80,750$127,500

Market Tier

Small City (0.85x)

Small city with below-average costs

Material Cost Comparison

Foundation concrete(Budget)

$25,500–$95,625

Framing lumber(Mid-Range)

$34,000–$127,500

Roofing materials(Premium)

$47,600–$178,500

Factors that affect your cost

Addition size (square footage)
Number of stories
Foundation type
Roofing integration with existing
Plumbing and electrical scope
HVAC extension
Architectural design
Permit and engineering fees
Interior finish level
Landscaping restoration

Get Quotes in Altadena

Founding Member

Premium spot in Altadena

Ambassador

Lead the Altadena community

Founding Member

Premium spot in Altadena

Search for remodelings in Altadena →

Altadena Housing Market

Median Home Price

$1,585,000

Homes for Sale

Price per Sq Ft

$776

Local Pros

536

Home Service Professionals Near Altadena

Agents 95lender 75multimedia_specialist 71Landscapers 64Appraisers 63Movers 60Inspectors 57Flooring 51

Median Household Income

$129,123

Median Home Value

$1,073,500

Median Rent

$2,250/mo

Homeownership Rate

78.3%

Population

41,921

Median Year Built

1945

Source: U.S. Census Bureau, ACS 2023 5-Year Estimates

Track Your Costs

Renovation

Home Addition Construction

Date

April 2026

Cost

$80,750

Vendor

Your local pro

Warranty

10-year material warranty

Altadena average: $34,000–$127,500

Before

Issue documented with photos

After

Repair completed, area sealed

Materials Used

Foundation concreteFraming lumberRoofing materialsWindows and doors

Warranty Details

10-year material warranty

Auto-Checkup Created

"Addition Inspection" — every 24 months

Added by youApril 2026

Property Health Score

Good

interior category +20 pts(68 → 88)

Documentation19/25

Maintenance20/25

Warranty22/25

Investment21/25

Your health score is calculated based on documentation completeness, maintenance currency, warranty coverage, and investment tracking.

Track this repair in PropDoctor →

Get a Personalized Estimate

Find a remodeling near me

I found several remodeling contractors in your area. Here are the top results:

Professionals Found

12 results

Smith & Sons

Connected

remodeling contractor

4.9(47)

BookQuote

J&R Home Services

remodeling contractor

4.7(23)

From $95/hr

MessageView

View All in ProPortal

Log my home addition construction in PropDoctor

I'll help you log this. I've pre-filled the details — review and submit:

Add to Property History

remodeling contractor

Title:remodeling

Category:remodeling contractor

Date:2026-04-06

Fill Form & Review

Fill Form & Submit

SmartSearch understands 51 action types across scheduling, vendor discovery, and home maintenance.

Try SmartSearch →

Cost FAQ

What is the average cost of home addition construction in Altadena?

The average cost of home addition construction in Altadena, CA ranges from $34,000 to $127,500. The final price depends on Addition size (square footage), Number of stories, Foundation type.

What factors affect home addition construction cost?

Key factors include: Addition size (square footage), Number of stories, Foundation type, Roofing integration with existing, Plumbing and electrical scope, HVAC extension, Architectural design, Permit and engineering fees, Interior finish level, Landscaping restoration. In Altadena, local labor rates and material availability also influence pricing.

How do I get accurate quotes for home addition construction in Altadena?

Get at least 3 quotes from licensed professionals in Altadena. Use Fizbo SmartSearch to find and compare local remodelings, read reviews, and request estimates — all in one place.

Explore Altadena, CA

Homes for Salein Altadena Rentalsin Altadena Home Servicesin Altadena Maintenance Guidesin Altadena Find Professionalsin Altadena

Home Addition Construction Cost in Nearby Cities

Los Angeles, CA Long Beach, CA Anaheim, CA Santa Ana, CA Irvine, CA Santa Clarita, CA

Home Addition Construction Cost in Altadena, CA

Cost Breakdown

Home Addition Construction Cost in Altadena

Material Cost Comparison

Get Quotes in Altadena

Altadena Housing Market

Track Your Costs

Home Addition Construction

Property Health Score

Get a Personalized Estimate

Cost FAQ

More Cost Guides for Altadena

Full Roof Replacement Cost

HVAC System Installation Cost

Foundation Crack Repair Cost

Kitchen Remodeling Cost

Bathroom Remodeling Cost

Explore Altadena, CA

Home Addition Construction Cost in Nearby Cities