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Licensed under Class B (General Building)

Second-Story Additions in Irwindale, CA — CSLB-Licensed Contractors

Find CSLB-licensed second-story addition contractors in Irwindale, CA. Every listing shows an active licence number you can check yourself.

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What to Expect from Second-Story Additions in Irwindale

A second-storey addition in Irwindale is the most structural thing most homeowners ever commission. Everything below has to carry what goes above, so the project starts with an engineer looking at the foundation and the existing walls, not with a floor plan.

Expect the house to be open to the weather for a period. The roof comes off, which means temporary protection, and it means the schedule is genuinely weather-dependent in a way a kitchen remodel is not. Ask how the house is protected between tear-off and dry-in, and what happens if it rains.

The staircase is the detail people underestimate. It has to land somewhere sensible on both floors and it consumes real square footage on the level you already live on. A design that adds 800 square feet upstairs while eating 60 downstairs is a different proposition from the one on the drawing.

  • Structural assessment of foundation and existing walls
  • Engineering and plan check submission
  • Roof removal and weather protection
  • Framing the new floor and walls
  • Staircase construction and downstairs reconfiguration
  • Extending plumbing, electrical and HVAC upward

Why CSLB Licensing Matters

Adding a storey involves structural, framing, roofing, plumbing, electrical and finish work, which puts it well inside Class B (General Building). It is the classification CSLB defines for structures requiring at least two unrelated trades, and this work requires many more than two.

Each contractor here holds that licence, active, at a Irwindale address, with the number linked to the register. On a project of this size it is worth checking the record again before each large payment, not only at signing.

The register says nothing about whether a firm has done this before, and second-storey work is not a scaled-up remodel. Ask how many they have completed in the last three years, whether any needed the foundation reinforced after the engineer looked, and what that did to the budget. A contractor who has a number for that has done the work; one who says it never comes up has not done much of it.

Every licence number below links to its record at cslb.ca.gov, where you can confirm status and expiry yourself.

Licensed Second-Story Additions Contractors in Irwindale

17 registered in Irwindale · 23,334 active CLEAR licences across Los Angeles County · page 32 of 973

Accurate Maintenance

BTORRANCE, CA 90501
CSLB 648454
(310) 328 0722View profile

Accurate Roofing

B| C-9| C39LOS ANGELES, CA 90061
CSLB 858242
(310) 644 1240View profile

Accustruct

BLOS ANGELES, CA 90049
CSLB 390921
(310) 308 1577View profile

Acd Builders Inc

B| D28CANOGA PARK, CA 91304
CSLB 1108939
(818) 900 7608View profile

Ace Access Homes

BLOS ANGELES, CA 90057
CSLB 1087045
(213) 500 7856View profile

Ace Building and Drywall Construction

B| C-9LA PUENTE, CA 91746
CSLB 1113021
(626) 264 7725View profile

Ace Collective Corp

BVALENCIA, CA 91355
CSLB 1134364
(661) 433 3734View profile

Ace Construction & Maintenance Inc

B| C-8| C10GLENDALE, CA 91203
CSLB 930819
(818) 210 3560View profile

Ace Construction & Plumbing Co

B| C36CANYON COUNTRY, CA 91387
CSLB 589372
(714) 719 7744View profile

Ace Construction & Remodeling Inc

BSHERMAN OAKS, CA 91403
CSLB 1067276
(310) 927 2819View profile

Ace Construction & Renovation

BCANOGA PARK, CA 91303
CSLB 1127598
(831) 524 7254View profile

Ace Construction + Solar

B| C46CULVER CITY, CA 90230
CSLB 899462
(310) 384 3644View profile

Ace Construction Co

B| C33LOS ANGELES, CA 90006
CSLB 570181
(213) 200 3707View profile

Ace Construction Co-General Contractor

B| C36LOS ANGELES, CA 90065
CSLB 343691
(323) 244 3359View profile

Ace Construction Group LLC

BARCADIA, CA 91007
CSLB 1101541
(650) 656 6666View profile

Ace Construction Inc

B| C-8| C21NORTH HOLLYWOOD, CA 91605
CSLB 809243
(818) 759 5608View profile

Ace Consulting Contractor

BREDONDO BEACH, CA 90277
CSLB 788729
(310) 874 6959View profile

Ace Design & Build

BLOS ANGELES, CA 90048
CSLB 1132942
(310) 596 5266View profile

Ace Expert Builders Inc

BVALLEY VILLAGE, CA 91607
CSLB 962221
(818) 571 5765View profile

Ace General Construction

B| C21| C27SUN VALLEY, CA 91352
CSLB 1060906
(818) 223 3366View profile

Accurate Property Restoration

A| BTORRANCE, CA 90505
CSLB 733551
(310) 534 1921View profile

Ace CD Inc

A| B| C27| D34GLENDORA, CA 91741
CSLB 847907
(626) 852 0257View profile

Ace Crane Service Inc

A| B| C10| D21CUDAHY, CA 90201
CSLB 555080
(323) 562 3037View profile

Ace Environmental Demolition

ASB| B| C21| C22| HAZBALDWIN PARK, CA 91706
CSLB 903401
(323) 725 0200View profile
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How to Get Started

  1. 1

    Check the licence

    Open the CSLB record from any listing below and confirm the licence is active and the classification matches the work. It takes seconds and it is the one thing you can verify without asking anyone.

  2. 2

    Call three recent references

    Ask each contractor for three jobs finished in the last year, then actually call them. Ask what went wrong and how it was handled — every project has something, and the answer tells you more than a list of successes.

  3. 3

    Tell us about the job

    Send us the scope and we will connect you. No account, no fee, and we do not sell your details on.

Licence first. References second. Reviews last. Why that order.

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Related Services in Irwindale

These sit under the same Class B (General Building) licence, so the same contractors are qualified for them.

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Frequently Asked Questions

Can my house support a second storey?+

That depends on the foundation and the existing wall framing, and only an engineer can answer it for your house. Some homes need footings reinforced or shear walls added first. Get that assessment before you fall in love with a floor plan, because it can change the budget substantially.

How many contractors handle second-storey additions in Irwindale?+

The register shows 17 holding an active Class B licence at a Irwindale address, and 23,334 across Los Angeles County. Class B is the classification this work falls under, so it lists the same pool as other general building pages.

Do we have to move out during the work?+

Often yes, at least for the phase when the roof is off. Ask for that period to be identified in the schedule up front, because temporary accommodation is a real cost that rarely appears in the initial quote.

How long does a second-storey addition take?+

It varies with engineering, plan check and inspection scheduling in your jurisdiction more than with the building itself. Ask for a schedule that names the inspection milestones rather than a single completion date.

Does a second-storey addition need permits from Building & Safety?+

Yes — structural plans, roof removal and new floor area require plan check and staged inspections through Building & Safety.

Every contractor here holds an active CSLB licence

Check any licence yourself in one click. When you are ready, tell us about the job and we will connect you.

Get matched with a licensed pro

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