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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 10 of 973

A & E Builders Inc

BGLENDALE, CA 91208
CSLB 980378
(818) 551 0770View profile

A & E Construction

BNEWHALL, CA 91321
CSLB 929501
(818) 331 4898View profile

A & E Construction & Painting Inc

B| C27| C33| C53| D49VAN NUYS, CA 91406
CSLB 1014539
(818) 968 8561View profile

A & F Painting

B| C33| D63VAN NUYS, CA 91401
CSLB 1027565
(818) 929 4351View profile

A & G Diamond Tile Corp

B| C54LANCASTER, CA 93536
CSLB 987632
(661) 733 5006View profile

A & G General Construction Inc

BGLENDALE, CA 91202
CSLB 984605
(818) 415 5194View profile

A & G Plastering Inc

B| C35INGLEWOOD, CA 90304
CSLB 1012723
(310) 686 5715View profile

A & G Remodeling and Repairs

BLANCASTER, CA 93536
CSLB 1146925
(818) 681 4134View profile

A & H Remodeling Inc

B| C28GRANADA HILLS, CA 91344
CSLB 836903
(818) 784 0372View profile

A & J Contracting

BGLENDORA, CA 91740
CSLB 970225
(909) 618 5804View profile

A & J Custom Quality Painting

B| C33LOS ANGELES, CA 90034
CSLB 660735
(310) 951 8788View profile

A & M Builders Group Inc

BTARZANA, CA 91356
CSLB 967204
(310) 913 1605View profile

A & M Construction

BCULVER CITY, CA 90232
CSLB 659183
(310) 770 1070View profile

A & M Construction Co

BWOODLAND HILLS, CA 91367
CSLB 775629
(818) 674 2375View profile

A & M Development Co

BSAN PEDRO, CA 90732
CSLB 1113000
(310) 710 3842View profile

A & M Landscaping

B| C27INGLEWOOD, CA 90303
CSLB 993824
(310) 487 3228View profile

A & N Building Innovations Inc

B| C43ARLETA, CA 91331
CSLB 1140809
(818) 554 3059View profile

A & O Construction -Builders LLC

BSHERMAN OAKS, CA 91406
CSLB 1089809
(818) 239 9577View profile

A & O Electric

B| C10WEST COVINA, CA 91790
CSLB 772627
(323) 846 1540View profile

A & O Inc

BBELL, CA 90201
CSLB 1107791
(323) 833 2825View profile

A & R Builders Express

BPARAMOUNT, CA 90723
CSLB 1153101
(562) 704 9888View profile

A & R Builders Inc

BGLENDALE, CA 91203
CSLB 1079436
(213) 505 0070View profile

A & R Construction

BSAN FERNANDO, CA 91340
CSLB 1021202
(818) 675 4533View profile

A & R Construction Inc

B| C10| C20NORTHRIDGE, CA 91327
CSLB 1044215
(818) 271 9275View 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 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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