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Santa Monica, CA 90402 · 21st St

427 21st St

Built 1931 · 6,180 sq ft
LOT 8,889 SQ FT · 2 STRUCTURES · APN 4278-028-018Lot Structure
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The home

What's on record

Year built
1931
Living area
6,180 sqft
Lot size
8,889 sqft
Structures on lot
2 main home plus another structure: a garage, guest house or ADU
Bedrooms
4
Bathrooms
4
Home type
Single-family
Parcel (APN)
4278-028-018

Major systems

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What's coming up

Systems and what to plan for

0 worth planning for · 3 to confirm. Open "How we estimate this" on any card.
RoofConfirm the year
Probably replaced alreadyWhen was it done?
HVACConfirm the year
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Water heaterConfirm the year
Probably replaced alreadyWhen was it done?

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Nearby on this street
211 21st Ston record · 2,024 sqft223 21st Ston record · 2,713 sqft315 21st Ston record · 2,625 sqft515 21st Ston record · 3,303 sqft521 21st Ston record · 3,785 sqft260 21st Ston record · 3,184 sqft

See all 111 homes on 21st St →

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What does your home need?

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The story of this home

Your home's update timeline

  • 2026
    permit on file, unconfirmedElectrical: Temporary Construction Power For Permitted 2-Story Garage Conversion To Adu Under Existing Building Permit #24Bld-4648. Install Temporary Electrical Service/Pole For Construction Use.
  • 2026
    permit on file, unconfirmedGeneral remodel: New Window On 1St Floor Of Main House. Plan Check 24Bld-4648
  • 2026
    permit on file, unconfirmedRoom addition: Unit #B - Partial Conversion Of An Existing Garage Into A 205 S/F Rec Room. 561 S/F Second Floor Addition Into An Adu. Plan Check 24Bld-4648.4/28/26-26Bld-1129 Rev. Update To Only The Structural Portion Of The Approved Permit# 24Bld-4648. No Change To Architectural Portion.
  • 2026
    permit on file, unconfirmedGeneral remodel: New 142 S/F Detached Pergola. Plan Check 24Bld-4648
  • 2020
    permit on file, unconfirmedRoom addition: New 138 Square Feet Addition On First Floor Of Existing Two-Story Plus Basement Single Family Residence Consisting Of New Windows, Door, And Walls.
  • 2016
    permit on file, unconfirmedPool: 427 21St St. - New Swimming Pool.

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