Marin County, California
Home Services in Tiburon, CA
Tiburon's peninsula homes enjoy sweeping bay views, and demand systems that perform. Ongaro & Sons delivers premium heating, cooling, plumbing, and electrical service across Tiburon and the Belvedere peninsula.
Ninety-odd years, four trades, one company. Ongaro & Sons has worked in the North Bay since 1932 and today does heating and cooling, plumbing, electrical and solar, holds Diamond Certified status and a BBB A+ Rating, and sits at 4.8 stars across 2,745 Google reviews. On a peninsula where nearly every lot is on a slope and nearly every house has a view worth protecting, the useful thing about four licenses is that one company works out where the equipment goes instead of three arguing about it afterwards.
On this page
A peninsula of slopes, and what that does to a job
Tiburon reaches south into San Francisco Bay, and the town is built on the hillsides of that peninsula rather than on flat ground. Almost every technical decision here starts from that.
Nothing arrives at the same level it leaves. Driveways drop away or climb steeply, entrances are up or down flights of steps, and equipment that would be wheeled across a suburban garage floor gets carried. A crawlspace on a slope is generous at the uphill end and impassable at the downhill one, and the work is reliably at the impassable end. All of that is time, and pricing it plainly at the walkthrough is the difference between a fixed number and a change order.
Runs are long and go through structure rather than around it. On a stepped hillside house, the distance from a garage-level water heater to a top-floor bathroom is real, and the route from a panel at the street to equipment at the back of the property is longer than the parcel suggests. Long hot water runs mean a genuine wait at the tap and a real volume of water down the drain. Long feeders put voltage drop into the design rather than the footnotes.
Where the outdoor unit goes is a real question. On a hillside lot with bay views, the available positions for a condenser or heat pump outdoor unit are limited by clearance requirements, by noise reaching a neighbor below or beside you, and by the fact that nobody wants it in a sightline. That is a design decision rather than an afterthought, and getting it wrong produces equipment that runs hotter, fails earlier and annoys somebody.
Marine air on three sides
Tiburon has water on three sides, and the air carries it. This is not the concentrated salt loading of the open coast, but it is meaningfully harder on outdoor equipment than air a few miles inland.
What it reaches is what nobody inspects: condenser coils and fins, cabinet fasteners, outdoor disconnect enclosures whose gasket gave up years ago, conduit fittings, and the terminations inside them. A corroded connection carrying load builds heat and gives very little warning before it stops being a nuisance.
The response is proportionate. Shelter the siting from the prevailing exposure where the lot allows it, which on a hillside is often possible if somebody thinks about it. Rinse coils as part of routine service rather than only when performance drops. And open outdoor terminations to inspect them rather than assuming an enclosure did its job, because on this peninsula that assumption is frequently wrong.
Two stories, two climates, one thermostat
The single most common comfort complaint we hear in Tiburon is that the upstairs and the downstairs are never right at the same time.
There is a reason it clusters here. A stepped hillside house has floors at genuinely different exposures: a lower level cut partly into the slope, cool and sometimes damp, and an upper level with the glazing, the view and the afternoon sun. Heat rises through the building on top of that. A single system with a single thermostat is being asked to serve two different buildings.
Adding capacity makes it worse rather than better, because an oversized system satisfies the thermostat faster and moves even less air before it shuts off. The fixes run in cost order. Correct the duct leakage and the return path first, since a starved return is a common finding in these houses. Balance the system second. Then zone it, or put a ductless head on the level or the room whose load has nothing in common with the rest.
One of our Tiburon customers describes exactly that outcome below: a single-zone system converted to two zones so the upstairs could finally be heated and cooled properly. That is the shape of the answer here far more often than a bigger machine.
The climate, and the right equipment for it
Tiburon is mild and bayside. Heating carries most of the year, and the summer cooling requirement is real but moderate, tempered by the water on three sides.
That profile suits a correctly sized heat pump on one machine and one circuit, running long at low output rather than cycling hard. In a house with sun-facing glazing on an upper level, variable-capacity equipment earns its keep twice over: it evens the building out rather than chasing it, and it runs quietly, which matters on a lot where the neighbor's window is close.
Two industry facts sit behind any repair-or-replace decision on older equipment. Domestic production and import of R-22 ended in 2020, so a leak on pre-2010 equipment can only be answered with reclaimed or stockpiled refrigerant, and that arithmetic usually points at replacement. R-410A is separately being phased down under the AIM Act toward a 700 GWP ceiling on newly manufactured residential equipment. Neither affects a system already running.
Plumbing on a stepped house
Two things recur.
The first is the wait for hot water, which on a house with the heater at garage level and bathrooms two floors up is not a minor irritation. Recirculation is the answer, and Marin Water publishes a rebate toward a hot water recirculating system. The important part is timing: designed in alongside a water heater replacement it is straightforward, and retrofitted afterwards it means opening things a second time.
The second is drainage on a slope. A lateral running downhill moves water fast enough to leave solids behind on the way, which fails differently from the standing-water bellies of flat ground, and surface water arrives at the downhill side of a building with force rather than pooling gently. Where mature trees stand over a buried line, roots follow moisture out of any joint that already leaks, thickening season after season, so a line that blocks in the same place every couple of years is describing a defect rather than a habit. On a landscaped hillside the excavation is the expensive part rather than the pipe, which is exactly why a camera inspection with a surface locate belongs before any quote.
Water supply, and what is in it
Tiburon sits inside Marin Water's central and southern Marin service area, and the supply is a blend rather than one source: roughly three quarters from the district's protected Mt. Tamalpais watershed and west Marin reservoirs, the remainder purchased from the Sonoma County Water Agency off the Russian River.
Hardness differs between them, at about 3.5 grains per gallon for the district's own water against about 6.5 for the Sonoma supply. Neither is severe, so a proposal built on aggressive treatment here deserves a look at the figures. The variation is the useful part, and it is why a tankless descaling interval should come from the state of your heat exchanger rather than from a published schedule.
Electrical work on a hillside lot
The load calculation decides most projects, and it starts from arithmetic rather than from what is printed on the panel door: floor area for lighting and receptacles, fixed appliances at the demand factors the code allows, heating or cooling as a single figure rather than both, and the total measured against what the service can deliver.
Where it comes back short, a service upgrade is one answer and listed load management equipment is the other. On a hillside lot the second is frequently the better project, because relocating or upgrading a service across a slope brings utility coordination, trenching and restoration that a flat lot would not.
The other hillside consideration is the feeder. Where a house sits well back or well below the street, or where a studio, garage or guest space is separated from the main building, run length puts voltage drop into the design and equipment at the far end behaves as though it has a fault. We measure under load rather than at rest, because a reading on a quiet circuit says nothing about what happens when two things start together.
Outages, backup and where the equipment lives
PG&E's Public Safety Power Shutoff program means power can be cut on purpose when conditions warrant, and a wooded peninsula loses power to weather in the ordinary way as well.
On municipal water the taps keep running, so what stops is refrigeration, heating and any pump. On a stepped house that pump may be an ejector serving a lower-level bathroom or laundry, and it stops while water keeps arriving.
Scope backup from a list rather than a catalog: what cannot go down, which here is usually any pump, the refrigerator, one heating circuit and enough light to live by. A subpanel serving those costs a fraction of covering the building, less again if it goes in while the panel is already open. Whether the source is a battery or an engine turns on how long outages actually run rather than on preference, and on a lot where noise and siting are sensitive that is worth thinking through properly. We do Generac installs under our own C-10 as a Certified Generac Generator installer.
Solar with views and slopes
State law obliges the town to run a streamlined process for small residential rooftop systems, approve a complying application administratively, and keep review inside health and safety, under Government Code 65850.5. The permit is a compliance check rather than a negotiation.
The design constraints are the peninsula's. Roof planes on a hillside house are often small, multiple and at awkward orientations, which means more penetrations per kilowatt and less usable area than a simple gable, before fire access pathways and ridge setbacks take more. Shading comes from terrain as well as trees on a slope, and both vary by month in ways an annual average conceals, so a study done plane by plane and month by month is the only kind worth having.
The economics changed as well. Interconnection applications from April 2023 onward fall under the Net Billing Tariff, where exported energy is credited at its hourly value to the grid rather than at the retail rate. Design therefore follows household consumption rather than roof area, and storage stopped being an upgrade and became part of a sensible design.
Permits, and which authority applies
Tiburon is an incorporated town, so building permits and inspections inside the town limits are issued by the town rather than by Marin County's Community Development Agency. Neighboring unincorporated pockets, including Strawberry and Paradise Cay, stay with the county, which runs a notably quick route for work replacing something already there, with no drawings required.
The two run at different speeds, and a contractor working mostly on one side of that line will quote the wrong timeline for the other. We confirm the parcel before writing anything.
Whoever issues it, the same two state obligations come attached. Energy compliance under Title 24 applies to any replacement, and the edition currently being enforced is the 2025 one, live since January 2026. Seismic restraint is the second, and 19211 is drafted to catch the appliance in place, up to 120 gallons, rather than only the one an installer is fitting.
The air rule, and why it is a panel question
The zero-NOx appliance standards from the Bay Area district do cover this address, as they cover all of Marin. What they regulate is narrower than the version that circulates: an installer fitting new equipment, on a schedule that arrives appliance type by appliance type, and the district's own wording ties it to burn-out of whatever is in place now. The rulemaking is not finished either. Nothing in your house today is touched by any of it.
What to plan for is capacity: an electric replacement wants a dedicated 240-volt circuit with headroom behind it, and on a hillside lot where a service upgrade is a bigger project than it would be on the flat, knowing that number early is what keeps the decision unforced.
What drives the cost in Tiburon
Access and carrying lead, and they are local rather than a surcharge. Steps rather than driveways, equipment carried rather than wheeled, and crawlspaces that are workable at one end and not at the other.
Run length is second. Feeders to separated structures, hot water runs across three levels, and trenching across landscaped slope that has to be reinstated.
Siting is third and specific to this town: the constrained set of positions where an outdoor unit can satisfy clearance, keep noise off a neighbor and stay out of a sightline.
Last on the list are the things an inspector will look for and nobody puts in a budget: strapping on the water heater, an expansion tank where a regulator or check valve has shut the system in, adequate combustion air, a vent that complies, and the fee itself.
Maintenance on a bayside hillside
Rinse outdoor coils and have outdoor enclosures, gaskets, fasteners and terminations checked, because marine air works slowly and the first symptom is usually a failure rather than a warning.
Flush the water heater annually and have the anode rod checked. Set a tankless descaling interval from what we find rather than from a chart, since the supply is a blend. Change filters on a sensible interval and have the capacitor and contactor tested before the first warm week.
On the slope, keep surface drainage clear before the rains, and where mature trees stand over a buried lateral put a camera on it every few years rather than waiting for a second backup. Where an ejector pump serves a lower level, test it and its alarm in autumn and know its breaker.
Then the two-minute items: ground-fault test buttons, and the main shutoff and angle stops exercised so they are not seized. A maintenance plan carries the whole list.
Where we work in Tiburon
We cover the downtown and the streets above Main and Tiburon Boulevard, the hillside lanes climbing toward the ridge, the Belveron and Del Mar neighborhoods, and the properties running out toward the point, along with the adjacent unincorporated pockets where the permit authority changes even though the drive does not.
Everything runs from our Petaluma headquarters. Southern Marin is a straightforward run, and booking ahead gets you the window you want. On a hillside property we would rather assess everything in one visit than come back up the steps.
How to choose a contractor for a hillside house
Ask where the outdoor unit will go and why. On a lot with clearance limits, a close neighbor and a view, that is a design decision, and a vague answer means it has not been made.
Ask what they intend to do about upstairs and downstairs being different, because if the proposal is simply a larger system it will make the complaint worse.
Ask how they will handle access and carrying, since that is a real line rather than an excuse.
Ask whether they have confirmed the permit authority, given that Tiburon is incorporated while pockets nearby are not.
Then confirm the classification: mechanical is C-20, plumbing C-36, electrical C-10, and holding all three is what stops a zoning project stalling between a mechanical contractor and an electrician.
What North Bay homeowners say
Ongaro turned our single zone HVAC system into a two zone. Works great. The upstairs can now be cooled and heated efficiently.
William D.
Remon is efficient, knowledgeable and personable He is a pleasure to have on my property. I am consistently pleased with Ongaro's service both fir plumbing and HVAC needs.
Candace K.
Home services across Tiburon and Marin County
One company, all four trades: heating and cooling across Marin County, plumbing across Marin County, electrical across Marin County, and solar across Marin County. Nearby we also serve Belvedere, Strawberry, Corte Madera and Mill Valley. The Marin County service overview covers the whole county.
Book service in Tiburon
Tell us what the house is doing and how it sits, particularly how many levels and where the equipment lives. If the complaint is that two floors are never right at once, say so, because that is a distribution question rather than an equipment one. Book online at a time that suits you, and scope, siting, permit authority and price are confirmed before work begins.
Tiburon homeowner questions
Who is the best home services company in Tiburon?
Ongaro & Sons, in the North Bay since 1932, Diamond Certified, holding a BBB A+ Rating and 4.8 stars across 2,745 Google reviews, with all four trades in-house. On a hillside lot the sharper test is design rather than reputation: whether a company can say where the outdoor unit goes and why, and whether it can carry a zoning project across the mechanical and electrical work without handing you between contractors.
The upstairs is always too warm and the downstairs too cool. Can that be fixed?
Yes, and usually without a bigger system. A stepped hillside house has floors at different exposures, with a lower level cut into the slope and an upper level holding the glazing and the afternoon sun, and heat rises on top of that. One thermostat cannot serve both. The fixes run in cost order: correct duct leakage and the return path, balance the system, then zone it or add a ductless head on the level that behaves differently.
Would a bigger system solve the comfort problem?
No, and it usually makes it worse. An oversized system satisfies the thermostat faster, which means it shuts off before it has moved enough air to reach the far parts of the house, and it never runs long enough to take moisture out of the air either. On a two-level hillside house that produces exactly the symptom people are trying to fix. Correct sizing plus zoning is the answer.
Does the marine air damage equipment here?
Enough to plan around, though not to the degree the open coast does. Water on three sides means the air reaches coils, fins, cabinet fasteners, outdoor disconnect enclosures and the terminations inside them. A corroded connection carrying load builds heat with very little warning. Shelter the siting where the lot allows, rinse coils in routine service, and have outdoor terminations opened and checked rather than assumed sound.
Where can the outdoor unit actually go on a lot like mine?
That is a design question here rather than a placement detail. The position has to meet the manufacturer's clearance requirements, keep noise away from a neighbor who may be very close, stay out of a sightline that matters, and remain reachable for service. Variable-capacity equipment helps considerably on the noise front, because it spends most of its life running slowly rather than cycling at full output.
It takes forever to get hot water upstairs. Is that fixable?
Yes, and on a stepped house it is worth doing. With the water heater at garage level and bathrooms two floors up, the wait is a daily irritation and a real volume of water down the drain. Recirculation solves it, and Marin Water publishes a rebate toward a hot water recirculating system. The timing is the important part: designed in alongside a water heater replacement it is straightforward, and added later it means opening things twice.
My drain blocks in the same spot every couple of years. Why?
Roots, most likely, and they are describing a joint rather than a habit. They follow moisture escaping a joint that already leaks and thicken season after season, so cutting them restores flow without closing the opening. Digging through mature landscaping on a slope dwarfs the cost of the pipe itself, so knowing exactly where the defect sits, in feet and in depth, is what makes a quote a quote.
Do I need air conditioning in Tiburon?
A moderate amount. The bay on three sides tempers the summer, so heating carries most of the year with a real but modest cooling requirement. A correctly sized heat pump covers both on one machine, and on a house with sun-facing glazing upstairs the variable-capacity version earns its keep twice: it evens the building out rather than chasing it, and it runs quietly on a lot where the neighbors are close.
In Tiburon, does the town or the county issue my permit?
The town, if the address is inside the Tiburon town limits, since Tiburon is incorporated. Unincorporated pockets nearby, including Strawberry and Paradise Cay, go to Marin County's Community Development Agency instead, which needs no drawings at all for work replacing something already there. The two run at different speeds, so a contractor used to one will describe the wrong timeline for the other.
Is solar worth it on a hillside roof?
Sometimes, and the study decides it rather than the sales pitch. Roof planes here are often small, multiple and awkwardly oriented, which costs usable area before fire access pathways take more, and shading comes from terrain as well as trees so it varies by month in ways an annual average hides. A study done plane by plane and month by month is the only kind worth having. Under current export rules the design follows what the house consumes rather than what the roof could produce.
Does my Tiburon water heater have to be strapped?
Yes. Section 19211 covers water heaters up to 120 gallons that are already installed, not only the one being fitted, and requires the appliance braced, anchored or strapped against displacement. On a hillside house the unit is often in a garage or a lower-level space added at some point after the original construction, fastened into whatever was convenient at the time.
Will I be forced to replace my gas water heater in Tiburon?
No. The Bay Area district's requirements attach to an installer fitting new equipment, the district ties them to burn-out of what is currently there, and the amendments are unfinished. What is worth planning for is capacity, since an electric replacement wants a dedicated 240-volt circuit and on a hillside lot a service upgrade is a bigger project than it would be on the flat.
What rebates reach a Tiburon address?
Two bodies. MCE, the county's community choice provider, runs the electrification programs, where the order matters more than the figure: a contractor on their list files the application, it precedes installation because nothing is paid retroactively, and ownership and occupancy tests apply. Marin Water separately publishes efficiency rebates, including one toward hot water recirculation, which is directly relevant on a house with long vertical runs.