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Room Additions in Los Angeles, CA
A bedroom, family room, or bump-out off the back or side of your LA house, built to match its roof and walls.
- Bedrooms, family rooms, and bump-outs
- Setbacks and floor area checked first
- Roofline and stucco matched
- Line-item scope in writing
CSLB Lic. [#000000] | Bonded & Insured | Written Workmanship Warranty
Book a Free Consultation
We walk the lot, check setbacks and the foundation, and scope your new room. No charge, no obligation.
Form fields: Full name, Email, Phone, Project address, Scope (Room addition, Home addition, Second-story addition, Primary suite addition, Bump-out, Not sure yet), Preferred date, Tell us about your house and lot. Submit button: Book My Free Visit (red #E12228).
Free Consultation
We pace off the room, check setbacks, and read the roof we'll tie into. Book a slot.
Matched to the House
A new roofline, stucco, and floors that look original to your home. See how it works.
Room Additions That Fit Your Los Angeles Lot
Serving: Toluca Lake, Northridge, Granada Hills, Burbank, Eagle Rock, Mar Vista, and Culver City.
Los Angeles Home Remodelers builds the room addition Los Angeles families ask for most: a new bedroom, bathroom, family room, or office off the back or side of the house. We handle the lot check, design, engineering, permits, and build under one contract, so the new room looks original.
Every room addition starts with your lot. We measure the side yard setback and the rear yard, then check your floor-area limit before anyone draws a wall.
Ground-level additions go wrong in the same three places: a new floor that sits lower than the old one, a roof tie-in that leaks at the valley, and stucco that never quite matches. We solve all three in design.
- Setbacks and floor area checked
- New footings sized by an engineer
- Floor heights matched at the door
- Roof tie-in flashed at every valley
- HVAC and panel sized for the room
- Warranty terms in writing [confirm]
Certified Service
CSLB Lic. [#000000]
Other Ways to Add Room in Los Angeles
If your yard is tight or you want a full suite, one of these may fit better. Each page explains the scope, the structure, and the permits.
Not sure where to start?
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Home Additions in Los Angeles
More square footage out or up, designed to match the house and permitted under one contract.
SEE THE SERVICE →
Second-Story Additions
Go up instead of out, with new footings, shear walls, and a stair planned from day one.
SEE THE SERVICE →
Primary Suite Additions
A bedroom, bathroom, and walk-in closet of your own, on the ground floor or upstairs.
SEE THE SERVICE →
Choosing a Room Addition Contractor in LA
Ask who checks setbacks and floor area before design, and who engineers the footings. Look up the CSLB license, and confirm it’s a B general building license.
Compare what each bid covers. A low room addition bid often leaves out the roof tie-in, the HVAC extension, or the panel upgrade, then adds them as changes. We price every line below up front.
- Site survey and setback check
- Plan check and LADBS permit
- Floor framing or slab pour
- Roof tie-in and flashing
- Rough plumbing and electrical
- Insulation, drywall, and stucco
- Design and engineered plans
- New footings and foundation
- Wall and roof framing
- Windows, doors, and egress
- HVAC extension or new unit
- Flooring, paint, and final
What Adding On With Us Looks Like
One project manager
Your project manager runs the survey, design, permits, and build, and answers your calls. You never chase an architect, an engineer, and a framer for three different answers.
Written scope, signed changes
Every item in your contract is its own line. If an old wall hides a surprise, we price the fix in writing, and you sign it before a crew touches it.
A locked site every night
A sealed-off work zone, floor protection inside, and a locked site each night. We tell you ahead of time which days the new wall opens into the house.
Five Room Additions LA Homeowners Build
Five kinds of room additions cover most LA requests. Pick the room first, because it decides the plumbing, the windows the code asks for, and how far into the yard you build.
Bedroom & Bath
A bedroom addition with its own bathroom is the rear addition we build most. We put the bath on the side nearest your sewer line, and we give the bedroom an egress window and a closet so it counts as a bedroom.
Family Room
A family room off the back opens the house to the yard. A wide opening in the old back wall needs a beam and posts sized by the engineer, so we plan that opening first.
Bump-Out
A bump-out adds a few feet to one room, such as a bigger bath or a dining nook. It's small, but it still needs a foundation, a roof tie-in, and the same permit as a larger addition.
Sunroom
A sunroom or garden room is mostly glass, and that's where Title 24 comes in. The energy code limits how much window area a new room carries unless the glass performs well, so we pick windows that pass the energy report [verify] and still show you the yard.
Home Office
A home office can stay small, so it often fits a side yard with setback room to spare. Plan outlets, data, and a door that closes, plus a window so the room doesn't feel boxed in.
How a Los Angeles Addition Matches the House
An addition looks tacked on when one detail misses. We settle these five in design, before any framing starts.
Matching Roofline
The new roof picks up your old pitch, eave depth, and shingle or tile. On low-slope ranch roofs, we map the drainage first so water can’t pond where two roofs meet.
Matching Stucco & Siding
Matching stucco means copying the texture, not just the color. We sample your finish, then run the new coat to a corner or a break line so the patch doesn’t show. Wood siding gets matched board for board.
Matching Floors
New floors should meet old ones at the same height, with no ramp at the doorway. Oak can often be woven in and refinished as one floor; tile usually changes at a threshold.
Window Rhythm
New windows should line up with your old head heights and use the same grid pattern. That’s what makes a rear addition look like it came with the house.
Open or Hallway
Open the old back wall for one big room, or connect through a short hall for a quieter bedroom. The choice sets the beam size and the privacy.
Room Addition Foundations in LA, Compared
Your addition’s foundation has to line up with the house it joins. We pick it after a site visit, because your old floor height and your slope decide most of it.
Foundation
Best for
Watch out for
Match to house
Slab-on-grade
Flat lots and slab ranches
Floor height must meet the old slab
Same floor height as the house
Raised (crawlspace)
Craftsman and raised homes
Vents, access, and pest barriers
Joists set level with old floor
Stepped on a slope
Hillside and sloping lots
Soils report and engineering likely
Steps down with the grade
Over a patio slab
Rarely; only if it tests sound
Old patios lack footings and rebar
Usually torn out and redone
Pier and grade beam
Expansive soil or steep lots
Engineer and soils report needed
Framed floor meets old level
Rear addition
A room off the back of the house, where most LA lots have the most depth. Choose it when the rear yard is deep and you can give up some patio.
Side addition
A room along the side yard. It suits wider lots and corner lots, but side setbacks are narrow, so the room usually ends up long and slim.
Go up instead
A second floor keeps your yard, but it adds structural work and often a move-out. See Second-Story Additions.
Unpermitted old rooms
An old enclosed patio or den built without a permit can stall a sale or a refinance. We can bring it up to code as part of your addition, or remove it and start fresh.
What Your LA Home Type Means for a Room Addition
Your house’s age and lot shape decide where the new room goes and what it sits on. Here’s how each type usually plays out.
1940s–60s
Valley Slab Ranch
Single-story ranches in Northridge and Granada Hills sit on slabs with wide, flat rear yards. A slab-on-grade addition matches the floor height, and the low-pitch roof keeps the tie-in simple once drainage is planned.
1910s–30s
Raised Craftsman
Craftsman bungalows in Highland Park and Eagle Rock sit on a raised foundation, so the addition gets a matching crawlspace. HPOZ areas may review the design, and rear additions usually draw fewer comments [verify].
Any era
Hillside Lots
Hillside homes in Mount Washington and Glendale usually need a stepped foundation or piers, plus a soils report. The Hillside Ordinance also limits floor area and grading, so we check both first [verify].
Any era
Corner Lots
A corner lot has two street sides, and the side facing the street often carries a bigger setback. That can push a side addition toward the back of the lot [verify].
Any era
Detached Garage Behind
Many Burbank and Mid-City lots keep a detached garage in back. A rear addition has to hold a legal distance from it and can’t cut off the driveway to required parking [verify].
Do You Need a Permit for a Room Addition in LA?
Yes. Any room addition in the City of Los Angeles needs plans, plan check, and a building permit from LADBS, and most get a zoning review for setbacks and floor area. Nearby cities like Culver City and Burbank run their own permit counters.
Reviewed with your addition
- New footings and foundation
- Framing, shear walls, and roof
- New circuits or a panel upgrade
- Plumbing for a new bathroom
- Title 24 energy compliance
Checked before you design
- Side and rear yard setbacks
- Residential floor area (RFA) limit
- Height and encroachment plane
- HPOZ or hillside overlays
- Easements and utility lines
Bedrooms need an egress window
The California Residential Code expects every new bedroom to have an emergency escape opening: a window big enough and low enough to climb out of [verify sizes]. We size it on the plans so it passes the framing inspection.
New rooms bring smoke and CO alarms
Adding a bedroom usually means updating smoke and carbon monoxide alarms through the rest of the house too [verify]. We put the alarms on the plans, so they’re wired before final.
Title 24 sets the energy rules
California’s Title 24 energy code covers the addition’s insulation, windows, lighting, and HVAC [verify current edition]. The energy report gets filed with your plans, and it sets how much glass a sunroom can carry.
Why Homeowners Pick Us Over the Lowest Bid
The lowest addition bid in Los Angeles usually leaves out the engineering, the footings, or the roof tie-in. We price the real scope during design, so your change-order column stays close to empty.
- Line-item scope, including footings, framing, and tie-ins
- One project manager from survey to final
- Materials get ordered only after the permit is issued
- A sealed work zone, so the rest of the house stays livable
- Payments tied to finished milestones
- A written workmanship warranty [confirm]
- Our own crews on your job [confirm]
Licensed & Insured
CSLB Lic. [#000000]
Free On-Site Estimates
Measured, not guessed
Written Warranty
On our workmanship
Local LA Crews
No day labor on site
How a Room Addition in LA Runs, Step by Step
A room addition runs in six phases. Plan check and the foundation set the pace, and you can usually stay home the whole time.
Phase 01
Site check & design
We survey the lot, confirm setbacks and floor area, and sketch the room with you. Design and engineering take about [4–8] weeks.
Phase 02
Plan check & permit
LADBS and zoning review your plans, usually over [6–12] weeks for an addition [verify]. You approve windows, roofing, and stucco samples while you wait.
Phase 03
Footings & slab
We dig and pour new footings, then the slab or raised floor. The city inspects the trenches and steel before any concrete goes in.
Phase 04
Framing & roof tie-in
Walls and roof go up, and we open the old roof only as far as the tie-in needs. The addition is dried in within about [1–2] weeks.
Phase 05
Rough-ins & opening
Plumbing, wiring, and ductwork run into the new room, and inspectors sign off. Then we cut through the old wall, behind a dust barrier.
Phase 06
Finishes & final
Stucco, drywall, flooring, and paint take about [3–5] weeks. After final inspection, we walk the room with you and fix your list.
Get Your Lot Checked Before You Draw a Room
One visit tells you where a new room fits, what it would sit on, and how it ties into your roof. The consult is free, and you won’t sign anything.
- Lot, foundation, and roof checked on site
- Room location and size sketched
- No obligation and no pushy follow-up calls
or send the form and we’ll call you back.
Book a Free Consultation
We walk the lot, check setbacks and the foundation, and scope your new room. No charge, no obligation.
Form fields: Full name, Email, Phone, Project address, Scope (Room addition, Home addition, Second-story addition, Primary suite addition, Bump-out, Not sure yet), Preferred date, Tell us about your house and lot. Submit button: Book My Free Visit (red #E12228).
Room Additions Across Los Angeles County
We build room additions from Northridge to El Segundo, on slab ranches, raised Craftsman homes, and hillside lots. Don’t see your neighborhood below? Call and ask.
- Toluca Lake
- Northridge
- Granada Hills
- Porter Ranch
- Chatsworth
- West Hills
- Reseda
- Lake Balboa
- Burbank
- Glendale
- Pasadena
- Eagle Rock
- Highland Park
- Atwater Village
- Mount Washington
- Silver Lake
- Los Feliz
- Hancock Park
- Windsor Square
- Mid-City
- Cheviot Hills
- Beverlywood
- Palms
- Mar Vista
- Culver City
- Westchester
- Playa del Rey
- View Park
- Windsor Hills
- Baldwin Hills
- Ladera Heights
- Torrance
- El Segundo
Room Addition FAQs
Tap a question to see the answer. The first one opens on its own.
Can I add a bedroom to my house?
Usually, yes, if your lot has setback room and your floor-area limit leaves space. We check both before design. A legal bedroom also needs an egress window, a closet [verify], and heat, so we plan those from the start. If the yard’s too tight, a second story may fit instead.
How big can a room addition be in Los Angeles?
Three rules set your size limit: the residential floor area (RFA) limit for your zone, the side and rear setbacks, and any hillside or R1 Variation Zone overlay [verify]. We pull your parcel on ZIMAS and measure the lot, then show you the largest room that fits.
Can I live at home during a room addition?
Yes, for most ground-level additions. We build the new room behind a sealed wall and open the house only near the end, for about [1–2] weeks. Expect noise on foundation and framing days, and short power or water shutoffs when we tie in [confirm].
Does a room addition add value?
A permitted bedroom and bathroom usually count for more at resale than the same space as a patio, because buyers and appraisers count bedrooms and baths. We’re builders, not appraisers, so ask a local agent for neighborhood comps before you set the budget.
Should my new bedroom have its own bathroom?
If it fits, yes. A bedroom with a bath works for a parent, a teen, or a future buyer. The bathroom adds a sewer run and venting, so we place it near your existing lines. If the budget’s tight, we can rough in the plumbing now and finish the bath later.
Can my HVAC and electrical panel handle a new room?
Sometimes. We run a load calculation for both. A small room may run off an extended duct from your current HVAC system, while a larger addition often gets its own ductless unit. Many older electrical panels need an upgrade, which can involve LADWP for a new service [verify].
Do I need a permit for a room addition in Los Angeles?
Yes. LADBS requires plans, plan check, and a building permit for any room addition, plus electrical, plumbing, and mechanical permits for the trades. We prepare and file the plans, answer plan-check comments, and book every inspection, so the room is on record.
How long does a room addition take?
Plan on about [6–10] months from first visit to final, with [3–5] months of that on site [confirm]. Design and plan check fill the rest. The foundation and the roof tie-in are the steps that stretch if we hit bad soil or old framing problems.
Will the roof leak where the addition ties in?
It shouldn’t, if the tie-in is framed and flashed right. We cut back the old roofing, lap new underlayment under it, and flash every valley and wall joint. We schedule the tie-in for dry weather and keep tarps on site in case rain comes early.
Does a new bedroom need an egress window?
Yes. Every sleeping room needs an escape window or door that meets the minimum opening size and sill height in the California Residential Code [verify]. We size the window on the plans, and since it also shapes where the bed goes, we settle it early.
More Remodels We Build in LA
Kitchen Remodeling
Cabinets, countertops, islands, and permits under one contract.
Whole-Home Remodeling
Every room, system, and permit on one schedule, with one team.
ADU Builders
Detached ADUs, garage conversions, and JADUs, designed and built.
Room Addition Planning Guides
BOOKING SITE VISITS FOR [MONTH] AND [MONTH]
See Where Your New Room Fits in One Visit
A room addition gives your family the bedroom, bath, or family room it needs without leaving the neighborhood. Los Angeles Home Remodelers handles the lot check, design, permits, and build. Book your free consultation today.
- Free lot and site visits, Mon–Sat
- CSLB Lic. [#000000], bonded and insured [confirm]
- Written workmanship warranty [confirm]
Mon–Sat, [8am–6pm]
Book a Free Consultation
We walk the lot, check setbacks and the foundation, and scope your new room. No charge, no obligation.
Form fields: Full name, Email, Phone, Project address, Scope (Room addition, Home addition, Second-story addition, Primary suite addition, Bump-out, Not sure yet), Preferred date, Tell us about your house and lot. Submit button: Book My Free Visit (red #E12228).