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Licensed under Class B (General Building)

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

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

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What to Expect from Second-Story Additions in Commerce

A second-storey addition in Commerce 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 Commerce 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 Commerce

23 registered in Commerce · 23,334 active CLEAR licences across Los Angeles County · page 11 of 973

A & R Reconstruction Inc

BBELL GARDENS, CA 90201
CSLB 1015009
(323) 493 1536View profile

A & R Telecom Inc

B| C-7| C10| C20BELLFLOWER, CA 90706
CSLB 725785
(562) 531 1785View profile

A & R Works

BGARDENA, CA 90248
CSLB 1049363
(310) 986 7021View profile

A & S Construction,Inc

BLOS ANGELES, CA 90035
CSLB 1155472
(310) 689 6683View profile

A & S Constructors Inc

BMONTEREY PARK, CA 91754
CSLB 921776
(562) 824 1618View profile

A & W General Contractor

BARTESIA, CA 90701
CSLB 659034
(562) 706 2858View profile

A & Z Decks & Stairs Inc

BBURBANK, CA 91501
CSLB 915577
(818) 359 1908View profile

A + Cal's Construction

BSTEVENSON RANCH, CA 91381
CSLB 879966
(661) 645 9988View profile

A 1 Construction & Designs Inc

BLOS ANGELES, CA 90034
CSLB 1002697
(310) 350 3583View profile

A 1 Construction Inc

BAZUSA, CA 91702
CSLB 785784
(818) 266 1444View profile

A 1 Recircle

BSANTA MONICA, CA 90405
CSLB 996510
(310) 795 3322View profile

A A - W L Const & Electric

B| C10| C36LA PUENTE, CA 91744
CSLB 503177
(626) 478 5001View profile

A A A - Value Window Services Inc

BDUARTE, CA 91001
CSLB 953237
(626) 962 7568View profile

A A A Construction and Development

B| C20CANOGA PARK, CA 91303
CSLB 903575
(818) 785 5552View profile

A A A Construction Services

BSHERMAN OAKS, CA 91423
CSLB 908576
(818) 521 1418View profile

A A A Remodeling & Development Inc

BLOS ANGELES, CA 91302
CSLB 1044944
(310) 402 4174View profile

A A A/C & Builder

B| C20SAN GABRIEL, CA 91776
CSLB 897373
(626) 278 4521View profile

A A Allied Co

BLOS ANGELES, CA 90019
CSLB 437778
(213) 507 7246View profile

A A C R General Construction Inc

BDOWNEY, CA 90241
CSLB 1067064
(844) 222 7421View profile

A A Construction

BWEST COVINA, CA 91791
CSLB 523161
(626) 858 9382View profile

A A Construction

BLA MIRADA, CA 90638
CSLB 970352
(562) 972 7680View profile

A A G Construction and Development

B| C10SAN DIMAS, CA 91773
CSLB 532120
(909) 599 0746View profile

A A G Construction Company

BLA CANADA, CA 91011
CSLB 950653
(310) 801 6216View profile

A A A All Star Construction Inc

A| BVALLEY VILLAGE, CA 91607
CSLB 1018926
(800) 975 5512View 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 Commerce

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

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  • Find a licensed garage conversions contractor in Commerce
  • Find a licensed custom home builders contractor in Commerce
  • Find a licensed tenant improvements contractor in Commerce

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 Commerce?+

The register shows 23 holding an active Class B licence at a Commerce 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 and Safety Division?+

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

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.

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