A free site visit, a check of what your lot allows and a written, line-item price.
Get your free estimateFast, Reliable Home Addition Contractor Across Somis
Adding a room to a Somis home usually costs between $180 and $420 per square foot all-in, with a typical 200 sq ft bedroom addition landing around $65,000 to $95,000 once permits, septic evaluation, foundation, framing, and finishes are counted. The number moves based on what’s under your parcel: septic tank placement, AG zoning setbacks, and county plan check timelines all pull the price one way or another. We’re Lodgewick ADU Ventura, led by Russ Delmar, and we put a written price in front of you before any work starts, so the number you sign is the number you pay. Call (831) 230-7250 to get your free estimate started.
Why Lodgewick ADU Ventura Is Somis’s Preferred Home Addition Contractor Company
Somis isn’t Camarillo and it isn’t Santa Paula. It’s an unincorporated pocket of Ventura County where most parcels run on septic and well water, and that changes how an addition gets designed, permitted, and priced. Our crews have scoped additions off Donlon Road, along Stockton Road, and up toward the hills around Bradley Road. We know what the county’s Building & Safety plan check will flag before you spend a dollar on drawings.
Russ Delmar runs every Somis project with a simple structure: written price first, real arrival window, clean job site, and a written guarantee on the whole job. The 365-Day Done Right Promise means if something isn’t right within a year, we come back and make it right at no charge. That commitment is in writing on every project we sign in Somis. When you call (831) 230-7250, a live person picks up. Not a voicemail. Not a chatbot. Day or night.
We’ve built trust in Somis one project at a time. Homeowners here have dealt with contractors who bid low, started digging, and then “discovered” a $20,000 septic problem that wasn’t in the contract. That doesn’t happen with us because we check the septic and the parcel zoning before we write the price.
Bathroom Addition Contractor in Somis
A Bathroom Addition Contractor in Somis has to answer one question before anything else: where is the existing septic tank and leach field, and will the new bathroom’s plumbing reach it without a pump or a tank relocation? In Somis, adding a bathroom to a home on septic usually runs $45,000 to $85,000 for a 50 to 80 sq ft addition, with tile, fixtures, ventilation, and the required septic evaluation included. If the leach field is too close or undersized, the septic upgrade adds $15,000 to $25,000 on top of that, and you’ll want that number in writing before permits are pulled.
Septic-aware bathroom design
We don’t design a Somis bathroom addition the way we would in Camarillo or Moorpark, where a city sewer lateral is a simple tie-in. On septic parcels, we map the tank and leach field using Ventura County GIS records before we draw a single line. Sometimes the bathroom needs to go on the opposite side of the house from where you pictured it, simply because gravity-fed waste lines need fall.
What a fixed-price bathroom addition includes
Our written price covers the pad or slab, framing, roofing to match the existing house, rough plumbing and electrical, ventilation, drywall, tile, fixtures, paint, and all county permit fees. The free estimate we give you after the site visit is the same number that goes into the contract. No allowances that balloon at the door.
Bedroom Addition Contractor in Somis
A Bedroom Addition Contractor in Somis spends as much time on setback requirements as on framing, because unincorporated Ventura County’s AG zoning rules often require a five-foot minimum clearance between any new foundation and an existing septic tank, and wider buffers from leach lines. A 200 sq ft bedroom addition in Somis typically runs $60,000 to $95,000 depending on whether it’s a ground-floor extension, a bump-out, or part of a second-story addition. That includes the county plan check, which on Somis parcels often adds two to four weeks compared to a city like Camarillo.
Septic setbacks change where the room goes
Our crew scoped a bedroom addition off Donlon Road where the county’s required 5-foot setback from the septic tank meant the foundation had to shift six feet toward the citrus windbreak. We brought our laser level and marked the leach field with county GIS in hand before the first stake went in, and the owner signed off the same day with a fixed-price change order instead of an open-ended allowance. That’s the difference between a Somis contractor who knows the county rules and one who finds out after the backhoe arrives.
Why plan check takes longer here
Somis parcels are reviewed by Ventura County Building & Safety, not by a city building department. That means your addition drawings sit in the same queue as projects from Ojai, Fillmore, and the county’s other unincorporated pockets. We submit complete sets with the septic evaluation and AG setback notes attached, which keeps the review from stalling on a request for more information.
We recommend starting the design process at least 8 to 10 weeks before you hope to break ground. The county’s timeline is the county’s timeline, and we’d rather give you an honest calendar than a rosy one.
Trusted Brands We Service in Somis
If your Somis addition pairs with a prefab ADU or a panelized wall system, we work with what fits your lot and timeline. We have hands-on experience with Dvele’s panelized building envelope, Cover’s prefab wall and floor panels, and Mighty Buildings’ prefabricated ADU modules. When a Somis homeowner wants a detached unit built fast and tight, those systems often cut framing time by weeks compared to stick-built. We order the panels, coordinate the crane or forklift delivery down Somis’s narrow farm roads, and handle the foundation, utilities, and finish work. Local parts and material runs come from Ventura County suppliers, so you’re not waiting on a truck from two states away.
Common Home Addition Contractor Problems We See in Somis Homes
- Septic surprises after the contract is signed. A bid written as if the parcel were on city sewer falls apart the day the county inspector notes the addition sits too close to the leach field. The $15,000 to $25,000 septic upgrade becomes a change order, and the homeowner eats it. We check the septic before we price anything.
- Permit timeline shocks. Somis additions go through Ventura County Building & Safety, which runs slower than Camarillo or Moorpark city review. Contractors who quote a two-week permit window are guessing. We tell you four to six weeks for plan check and we’re usually within days of that.
- AG zoning stop-work orders. Building to a standard soffit height without checking the county’s agricultural zoning setback for your parcel can trigger a stop-work order and foundation rework. We pull the parcel’s zoning sheet before we design, not after the inspector shows up.
- Prices that creep up after demolition starts. Open-ended allowances for “unforeseen conditions” are how a $75,000 addition becomes $110,000 by framing. Our written price covers what we scoped, and if something real changes, we bring you a fixed-price change order before any additional work happens.
Pricing for Home Addition Contractor in Somis, CA
Here are the numbers we actually see on Somis parcels, based on current Ventura County permit fees, material costs from local suppliers, and the septic and setback realities of unincorporated lots. A bathroom addition runs $45,000 to $85,000. A 200 sq ft bedroom addition lands between $60,000 and $95,000. A 400 sq ft ground-floor extension and bedroom suite typically runs $110,000 to $170,000. A full second-story addition starts around $180 per square foot and often exceeds $250 per square foot on older Somis homes that need structural upgrades.
What moves the price most in Somis is what’s under the grass: septic proximity, soil type for the foundation, and whether the parcel sits on flat ground off Stockton Road or on a slope near Bradley Road where retaining walls and grading enter the equation. The free estimate we give you after a site visit breaks all of this down line by line. Call (831) 230-7250 to schedule yours.
We Also Serve Cities Near Somis
While this page is written for Somis homeowners, our Home Addition Contractor team also serves Camarillo, Santa Paula, Moorpark, and Newbury Park. If you’re in a neighboring city and searching for a Somis crew that knows Ventura County septic and setback rules, we’re glad to take a look at your parcel too.
Serving Somis, CA - Our Local Coverage Area
We’re based in the Somis 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 About Home Addition Contractor in Somis
Yes. In Somis, Ventura County requires a septic evaluation for most room additions on parcels served by private septic systems, even when no new bathroom or plumbing is part of the scope. The county wants to confirm the existing tank and leach field have capacity for the added occupancy and that the new foundation meets required setbacks. We include the evaluation in our written price so it’s never a surprise line item after permits are pulled. Call (831) 230-7250 to talk through your specific parcel.
Somis permits go through Ventura County Building & Safety rather than a city building department, which means you’ll pay county fee schedules rather than Camarillo’s city rates. In practice, a Somis addition permit often runs 10% to 25% more than the equivalent permit in Camarillo, and the plan check timeline runs longer. We carry those county permit costs inside our written estimate so you’re comparing real totals, not just line-item guesses. For an exact quote on your planned addition, call (831) 230-7250.
Plan on 16 to 22 weeks from the first call to the day you walk into the finished room. That breaks down as roughly 2 weeks for design and site evaluation, 4 to 6 weeks for Ventura County plan check, 2 to 4 weeks for foundation and septic coordination, and 8 to 10 weeks of construction. Some Somis parcels move faster when the septic is already documented and the parcel is flat. We give you a written project calendar with the estimate, not a verbal promise. Call (831) 230-7250 to start.
Somis parcels often carry costs that city-lot bids don’t: septic evaluations, longer county plan checks, AG zoning setbacks that push foundations into more expensive positions, and the extra engineering for slope or soil conditions on parcels that were once citrus or avocado groves. Some bids look cheaper because they ignore those costs until after the contract is signed, then add them back as change orders. Our per-square-foot price includes the Somis reality up front, so the comparison isn’t apples to oranges when you line bids up side by side. Want to see the breakdown? Call (831) 230-7250.
Yes, but only if the existing septic system can handle the additional fixture load and the plumbing can reach the tank by gravity or with a permitted pump system. Most Somis garages sit far enough from the house that a direct gravity tie is not feasible, which means either a new septic line, a pump chamber, or in some cases a separate holding tank, all of which adds $15,000 to $30,000 to the project. We evaluate the garage, the tank, and the leach field before we quote anything. Call (831) 230-7250 and we’ll walk the site with you.
Written by Russ Delmar, Owner at Lodgewick ADU Ventura, serving Somis since establishing the location with the Kingswell family of home-service companies.
