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 Glendale
A room addition or ADU in Glendale typically runs $45,000 to $130,000 for the build itself, and the two biggest variables are whether your lot is on the flatland below the 134 or up in the hillside fire zones where Chapter 7A materials and geotechnical review add real money. We’re Barrett & Sons Construction, and Home Additions & ADU has been a core part of what we build since Tom Barrett founded the company in 1998. If you’re weighing a garage conversion in Adams Hill or a detached ADU above Kenneth Village, call (877) 610-1318 and we’ll walk the property with you before you spend a dollar on plans.
Why Barrett & Sons Construction Is Glendale’s Preferred Home Additions & ADU Company
Tom Barrett’s name is on the truck and his sons run the crews. That’s the short version. The longer version: we’ve done additions and ADUs all over Glendale, from flatland bungalows to cut-and-fill hillside lots, and we know which projects Glendale Building and Safety will want a soils report on before you’ve finished the first cup of coffee at the counter.
Customers in Glendale keep our phone ringing because we do what the national outfits won’t. Every scope item and every allowance goes on paper before work starts. Every price change is a written change order, not a surprise at the end. Permits get pulled and inspections get signed on every eligible job, because the last contractor most people used told them permits were optional. Ask anyone on your street, or look up the license number yourself. Tom publishes his name, address, and license number because he lives twenty minutes away and wants you to know where to find him.
Every job carries the 90-Day Done Right Promise in writing. If something isn’t right, one call brings Tom back. No fine print, no runaround.
Our Home Additions & ADU Services in Glendale
ADU Design & Permitting
Glendale’s planning process rewards people who show up with complete drawings and a clear understanding of what the city will ask for. We handle design coordination and the permit package as one piece of the job, so you’re not stuck emailing a designer in another county while your review stalls. On hillside parcels in Verdugo Woodlands and Chevy Chase Canyon, we build the Chapter 7A fire-resistance requirements into the plans from day one, because retrofitting a design after the fact is how budgets quietly double.
Garage Conversion ADU
If your Glendale garage predates 1960, it’s likely sitting on a slab that was never engineered for living space, and the city will want it checked. A garage conversion in Glendale typically runs $30,000 to $80,000 depending on whether we’re adding a bathroom, kitchenette, or separate utility connection. The flatland neighborhoods like Adams Hill and Grandview are thick with detached garages that convert cleanly. The catch is drainage: many of these older alleys were graded before modern stormwater rules, and we plan for that before the city brings it up.
New Detached ADU
For a detached ADU, you’re looking at roughly $90,000 to $220,000 in Glendale, and that spread is driven by site work more than anything else. A flat lot near Kenneth Village with easy utility access sits at one end. A hillside lot in the 91207 ZIP where we’re cutting into a slope, adding retaining walls, and bringing power up a grade sits at the other. We’ll tell you which end you’re on before you sign, because the written estimate is the whole point.
Junior ADU & Interior Conversion
A junior ADU, usually a converted bedroom or attached space, is the fastest path to rental income on a small lot, and it often avoids the full site review a detached unit triggers in Glendale. Interior conversions like a finished sunroom or enclosed patio fall into a similar category. If you’re also thinking about updating the main house while we’re there, we handle Kitchen Remodeling in Glendale and Bathroom Remodeling in Glendale, so one crew can sequence the work without two contractors tripping over each other.
What happens when you call
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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 Glendale
We stock and install materials you can look up, not mystery brands off a van. For hardscape and site work around ADUs and additions, we run Techo-Bloc and Cambridge pavers for patios, walkways, and retaining-wall caps, and Quikrete products for footings and slab repair where an engineered mix isn’t called for. If you’re in the middle of a Glendale project and need specific pavers or materials matched, we can usually source them through our local suppliers faster than a big-box order desk.
Common Home Additions & ADU Problems We See in Glendale Homes
- Hillside fire-zone requirements catch people off guard. In Verdugo Woodlands, Chevy Chase Canyon, and Montecito Park, the VHFHSZ overlay means ignition-resistant cladding, ember-resistant vents, and Class A roofing. We’ve had homeowners come to us after another contractor’s plans got bounced at the first review.
- Older flatland foundations weren’t built for second stories. The 1920s and 1930s bungalows around Adams Hill and Grandview sit on cripple-wall foundations that predate modern seismic code. Adding a second story often means retrofit work first, and we plan for it in the estimate, not after demolition starts.
- Clay soil moves under Glendale slabs. Several residential areas in Glendale have clay-rich soil that swells and shrinks through wet and dry seasons. We see foundation cracks and drainage failures that push costs up if ignored, which is why we recommend an engineered slab on new builds rather than guessing.
- Santa Ana wind drives real ember risk in the hills. Glendale channels some of the strongest Santa Ana winds in the LA basin through the Verdugo passes. That’s not a code detail; it’s how houses burn. Fire-hardening upgrades on additions in the 91207 and 91208 ZIPs are practical necessity, not paperwork.
Pricing for Home Additions & ADU in Glendale, CA
We Also Serve Cities Near Glendale
Besides our work across Glendale, our crews regularly take on projects in Burbank, La Cañada Flintridge, Echo Park, and Silver Lake. If you’re a few minutes over the city line, call anyway. The estimate is free and we’ll tell you straight whether we’re the right fit for your street.
Serving Glendale, CA - Our Local Coverage Area
We’re based in the Glendale 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 Glendale
How fast can Barrett & Sons get to my Glendale home for an estimate?
We typically schedule estimates in Glendale within a few business days, and for urgent structural issues we can often see you sooner. Call (877) 610-1318 and a live person answers, 24/7. Not a voicemail box, not an out-of-state call center.
Do you cover all Glendale neighborhoods, including the hillside areas?
Yes. We work from the flatland bungalows in Adams Hill and Kenneth Village up through Verdugo Woodlands, Chevy Chase Canyon, and Montecito Park in the 91207 and 91208 ZIPs. Hillside projects take more review time and usually involve geotechnical or Chapter 7A requirements, and we handle both in the plan, not as an afterthought.
How does your pricing compare to other Glendale contractors?
A Glendale room addition with us lands in the same range as other licensed local contractors: $45,000 to $130,000 for most builds. What’s different is the paper trail. Every allowance, scope item, and price change is written before work proceeds. If another contractor handed you a verbal number, bring us their written estimate and we’ll give you a Free Second Opinion, line by line.
Will the price change once work starts on my Glendale addition?
Only if the scope changes, and only with a written change order you sign first. An allowance that isn’t on paper is a surprise waiting for a date. We don’t play that game. If site conditions force a change, like hidden foundation damage on a 1930s bungalow, we document it in writing and talk through the cost before we touch it.
Does the 90-Day Done Right Promise apply to additions and ADUs in Glendale?
Yes. It’s written on every contract we sign in Glendale. If something isn’t done right within 90 days of completion, one call brings Tom Barrett back to make it right. No phone tree, no corporate claims department. Just Tom, his sons, and the crews who carry the Barrett & Sons name.
If you’re ready to price out your Glendale addition or ADU, call (877) 610-1318 for a free estimate. We’ll walk your lot, tell you what the city will want, and hand you a written number you can actually compare.
Written by Tom Barrett, Owner at Barrett & Sons Construction, serving Glendale and surrounding communities.