Free written scope consultation - allowances, timeline, and change-order rules on paper before a single trade is scheduled
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AfterFast, Reliable Home Additions & ADU Across Tujunga
A room addition in Tujunga typically runs $45,000-$130,000, while a detached ADU lands between $90,000 and $220,000 depending on site conditions. Those ranges reflect what we see on real projects here, not a generic estimate from someone who has never walked a hillside lot off Foothill Boulevard. We are Barrett & Sons Construction, owner-operated since 1998, and we work in Tujunga every week. If you are planning an addition or ADU in the 91042 or 91043 ZIP codes, call us at (877) 610-1318 and we will give you numbers that hold up once excavation starts.
Why Barrett & Sons Construction Is Tujunga’s Preferred Home Additions & ADU Company
Tom Barrett founded this company in 1998 and his sons run the crews. That matters in a place like Tujunga, where the contractor you hire needs to understand something specific: nearly every project here triggers Los Angeles’s Very High Fire Hazard Severity Zone review. A room addition that would sail through permitting in Pacoima needs Chapter 7A ignition-resistant construction up here, ember-resistant vents, fire-rated eaves, Class A roofing. We plan for that from day one, so it shows up in your written estimate instead of as a surprise change order later.
Tujunga customers call us because our Home Additions & ADU team writes every scope, every allowance, and every price change on paper before work begins. No verbal promises. No end-of-job invoices that look nothing like the phone quote. And our 90-Day Done Right Promise is written on every contract: if it is not done right, Tom comes back and makes it right, one call. Ask anyone on your street, or look up the license number yourself.
We answer the phone. A live person, 24 hours a day, 7 days a week. Not a voicemail box, not an out-of-state call center. When you call about an ADU on a hillside lot near Mount Gleason, you talk to someone who knows the terrain.
Our Home Additions & ADU Services in Tujunga
New Detached ADU
A new detached ADU in Tujunga is a full build, foundation to roof, and the site prep alone gets complicated fast on canyon-adjacent lots. Loose alluvial fan deposits near Big Tujunga Canyon routinely force footings to be deepened to caissons or grade-beams, which valley-floor crews never anticipate. We do. Our ADU builds in Tujunga run $90,000-$220,000, and we coordinate every slope, drainage, and Chapter 7A requirement before the first inspection.
Junior ADU & Interior Conversion
Converting existing interior space, a bonus room, a den, part of a larger bedroom, into a junior ADU is often the most affordable path in Tujunga because you are working within an existing footprint. But even interior conversions can trigger fire-safety review when the square footage change hits the permit counter. We handle the design, the permit package, and the build so your JADU passes inspection and stays legal for rental or family use.
ADU Site Prep & Utilities
Before any ADU foundation goes in, the site has to work. That means grading, drainage, retaining walls if you are on a slope, and utility runs sized for a second dwelling. Tujunga’s steep alluvial terrain above Big Tujunga Canyon amplifies debris-flow and flooding risk after any burn, so drainage plans that look like overkill on paper are exactly what local inspectors want to see. We pull permits, we coordinate the engineering, and we build it right.
Garage Conversion ADU
Converting a 1940s-1960s garage in Tujunga into a livable ADU typically runs $30,000-$80,000. The cost swings on what is hiding in the walls and under the slab. Older garages in this area were rarely built with insulation, proper footings, or any fire-resistant detailing, so a permit-triggered retrofit can add scope quickly. We walk you through exactly what your garage needs before we write the first change order.
What happens when you call
- 1
A real person answersNo phone trees - you reach a local pro.
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You get an upfront price rangeHonest numbers before anyone is dispatched.
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A background-checked tech heads outLicensed & insured, dispatched right away.
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You approve before work beginsNothing starts until you say go.
Trusted Brands We Service in Tujunga
When your addition or ADU calls for new windows and doors, we install brands you can look up: Simonton for solid vinyl frames that hold up to canyon wind, PGT for impact-rated units when the fire-safety review demands them, and Ply Gem where budget and code align. We do not show up with mystery materials off a van. You will see the brand name on the quote, on the box, and on the finished product, and you will know exactly what you paid for.
Common Home Additions & ADU Problems We See in Tujunga Homes
- Chapter 7A sticker shock. A homeowner orders a standard room addition without budgeting for ember-resistant vents and fire-rated soffits, then faces a change order that doubles the permit cost. We include those line items from the start.
- Alluvial fan surprises. A contractor starts a garage conversion ADU on a hillside lot and hits loose alluvial deposits, needing caissons or grade-beams that were never in the allowances. The project stalls mid-rough-in. We have hit this exact condition near Big Tujunga Canyon and we plan for it.
- Window swaps that void HOA approval. Someone replaces builder-grade windows with non-impact-rated units on a canyon-facing wall, voiding the HOA architectural approval and failing the fire-safety review. We flag this before it becomes an expensive redo.
- Drainage plans treated as optional. The Station Fire burned the hillsides directly above this community in 2009, and the destabilized slopes make post-fire debris-flow a live concern on every hillside project. Tujunga inspectors expect drainage and grading submissions. We do not fight them on it.
On a hillside lot near Big Tujunga Canyon, our crew was called to add a second story to a 1950s ranch. The initial scope called for standard footings, but excavation hit loose alluvial fan deposits and we had to deepen to caissons, a subsurface surprise valley-floor crews rarely expect but Tujunga inspectors treat as routine. We coordinated the change order before rough-in, kept the draw schedule clear, and finished with a fire-rated roof assembly that passed inspection on the first visit.
Pricing for Home Additions & ADU in Tujunga, CA
Here is what we see on real Tujunga projects, with real numbers:
| Project Type | Tujunga Price Range |
|---|---|
| Home Addition | $45,000-$130,000 |
| ADU Construction | $90,000-$220,000 |
| Garage Conversion | $30,000-$80,000 |
| Second Story Additions | $80,000-$180,000 |
Hillside lots cost more than flat lots because of grading, retaining, and fire-safety compliance. A junior ADU built inside an existing home will land at the low end. A new detached ADU with utilities run up a slope will not. We give you a written line-item estimate before work starts, and every change after that comes on paper. Call (877) 610-1318 for your free estimate.
We Also Serve Cities Near Tujunga
Our Home Additions & ADU in Tujunga work regularly takes us into Sunland, La Crescenta-Montrose, Shadow Hills, and Burbank, where the same hillside and fire-safety conditions apply. If you are a few blocks outside the Tujunga ZIP codes, call us anyway. We are local to the area and our scheduling is coordinated from our Los Angeles office, so crews reach these neighborhoods on a normal schedule.
Serving Tujunga, CA - Our Local Coverage Area
We’re based in the Tujunga area and know this community well. Use the map below to see our service coverage - if you’re nearby, we can almost certainly help.
FAQs - Home Additions & ADU in Tujunga
Yes. Nearly every home addition or ADU in the 91042 and 91043 ZIP codes sits inside Los Angeles’s Very High Fire Hazard Severity Zone, which triggers Chapter 7A ignition-resistant construction requirements including ember-resistant vents, fire-rated eaves and soffits, and Class A roofing. There is no small-project exemption for a 400-square-foot ADU. We design to Chapter 7A from the first drawing so the permit estimate reflects reality. Call (877) 610-1318 to talk through what your specific lot will require.
It depends on your original builder warranty terms, but in most cases an addition performed by a licensed contractor with permits pulled does not void the original home warranty as long as the work does not alter the original structural envelope in a way the warranty prohibits. The larger risk is on the hillside: if the addition is not engineered for the alluvial soils and slope drainage, you may inherit problems the warranty will not touch. We pull permits so the work is inspectable, and we coordinate any warranty-sensitive questions with you before construction starts.
A hillside ADU in Tujunga typically runs 20% to 35% more than a flat-lot ADU of the same size because of caissons or grade-beams, retaining walls, drainage engineering, and Chapter 7A fire-safety materials that flat-lot projects in the valley never face. A flat-lot ADU here starts around $90,000, while the same footprint on a slope near Big Tujunga Canyon can push well past $150,000 depending on the grade. We line-item these costs in writing so you see exactly where the slope premium lands.
In Tujunga, almost any garage conversion ADU that goes through permits will trigger some level of fire-safety review because the property sits in the Very High Fire Hazard Severity Zone. The retrofit may be limited to the newly converted space, ember-resistant vents, fire-rated drywall on the new walls, a compliant door and window package, but it rarely disappears entirely. We can tell you the specific scope after a site visit, and we will put the fire-safety costs in writing before you sign anything.
Because the 2009 Station Fire burned the hillsides directly above the community, destabilizing slopes and making post-fire debris-flow a documented, ongoing risk on every hillside project near Big Tujunga Canyon. Tujunga inspectors are not being difficult, they are protecting your house and the ones downhill from you. We treat drainage and debris-flow planning as standard scope, so your sunroom addition does not stall at plan check. Call (877) 610-1318 and we will walk you through what your lot actually needs.
Get Your Free Estimate for Home Additions & ADU in Tujunga
If you are planning an addition or ADU in Tujunga, do not take a flat-lot contractor’s word on what it will cost up here. The fire-safety rules, the alluvial soils, the slope drainage, all of it changes the math and the scope. We are Tom Barrett and his sons, owner-operated since 1998, and we have built in these hills enough to know what the inspectors expect and what the dirt will do when you dig. Call (877) 610-1318 for a free, written estimate. The permit inspector works for you, not for me, and that is exactly how we build.
Written by Tom Barrett, Owner at Barrett & Sons Construction, serving Tujunga since 1998.