Rivermark · North Santa Clara · North San Jose · Milpitas
Somebody else owns the wall.
In a townhouse or a condominium the equipment is only half the job. The other half is the shared structure, the common area, the neighbour on the other side of the party wall and the association that has to approve it first.
What we doTownhomes, condos, stacked flats and HOA-governed properties
What comes firstThe approval. We prepare the submittal before anything is ordered.
What we watchNoise into the structure, which is the complaint behind most of these calls
Attached housing in north Santa Clara — walls, roofs and drives all shared
01
01 — The difference
Four things a detached house never has to think about.
None of this is exotic. It is the ordinary condition of most new housing in this part of the valley, and it is invisible to a contractor whose week is single-family homes.
A system in an attached home is installed inside a structure that other people live in, reached through space that other people own, and governed by a document that other people wrote. Each of those changes what is possible, and none of them is about the machine.
Sound travels through structureNoise reaching a neighbour is almost never airborne from the machine. It is structure-borne: equipment bolted hard to framing, duct touching a stud, a line set strapped rigidly to a joist. That changes the fix entirely.
The lot
There is nowhere to put the outdoor unitNo side yard. So it goes on a roof, a podium deck, a balcony or a small designated pad — and which of those exists is decided by the building, not by preference.
The route
Everything arrives through common areaCorridors, lobbies, lifts, a loading bay, a shared drive. Protecting those is part of the job and it has to be planned, not improvised on the morning.
The document
The association decides before you doWhat is permitted, where, how it may look and who is liable afterwards is set by your governing documents. That is the first thing we ask for and the last thing most contractors mention.
02
02 — What we do
Five services.
Attached housing first, and a light commercial side in the same buildings — the amenity rooms, the offices and the small suites. Each one is written out in full on the services page.
01
Replacement in attached homes
Townhomes, condos and stacked flats. Sized to the unit, sited where the building allows, isolated so it does not travel, and submitted for approval before anything is ordered.
The two configurations this housing stock actually uses. Both have constraints a detached house does not — a closet with no service clearance, a line route that has to cross a fire-rated assembly.
We prepare the package: what is proposed, where it goes, what it looks like, how it is isolated, and who is responsible for what afterwards. Free with any quote, and yours to use elsewhere.
Being called by the neighbour, or by the board. Isolation pads, flexible connectors, breaking rigid contact and re-hanging duct — almost always cheaper than the new machine somebody was about to buy.
Diagnostic first, quote second. Annual service for owners, and scheduled service for associations and managers who look after several units in one building.
No electrical panel work, no roofing or waterproofing, no structural work, and no legal advice about your CC&Rs. We prepare a submittal; we do not tell you what your documents mean.
It is the single most common reason somebody in an attached home rings an HVAC contractor, and the single most commonly misdiagnosed.
The instinct is that the machine is loud and a quieter machine would fix it. Occasionally true. Far more often the problem is that sound is not travelling through the air at all — it is travelling through the building.
Equipment bolted rigidly to framing turns the framing into a diaphragm. A duct touching a stud couples every rumble into the wall. A line set strapped hard to a joist carries compressor vibration two rooms away. In each case the machine could be replaced with a silent one and the neighbour would still hear something, because the path is structural.
So we chase the path before we discuss equipment. Isolation pads, flexible connectors, re-hanging duct on resilient supports, breaking direct contact wherever we find it. It is almost always cheaper than the replacement somebody was about to buy, and it is the work we are most often thanked for.
A party wall does a great deal for airborne sound and very little for structure-borne
When it is not fixable
Sometimes the equipment sits in a location the building never should have used, and isolation only takes it so far. We will tell you when that is the case and what relocating it would involve — including whether the association would allow it — rather than selling you a sequence of partial fixes.
04
04 — The other signature page
The approval comes first.
Not after the quote. Not once the equipment is on the van. First.
Most of the disasters in this kind of work are procedural rather than technical: equipment installed without approval and ordered removed, a submittal rejected for a reason that could have been designed out, a job that stalls for six weeks because a board meets monthly and somebody missed the agenda deadline by two days.
We prepare the submittal package with every quote, at no extra cost, and it is yours to use with another contractor if you would rather. That is not generosity — it is the cheapest possible way for us to avoid the two months of everybody's time that a rejection costs.
Why the meeting calendar matters more than the lead time
Who is liable for the penetration afterwards, and why that sentence matters
What to do when the answer is no
What we will not do, which is interpret your documents for you
Roof-mounted, which is common here and is always common area
05
05 — How a job goes
Five steps, and two of them happen before we order anything.
Call
Tell us the building type, the floor, and whether an association is involved. That decides almost everything about the visit.
Site visit
The unit, the equipment location, the route through common area, and the governing documents if you have them to hand.
Quote and submittal
Together, in writing. The submittal package is free and it is yours whether or not you use us.
Approval
We wait for it. We do not order equipment, book a lift or start work until the association has said yes in writing.
The work
Hours agreed with management, corridors protected, permit pulled, and nothing left in common area overnight.
06
06 — Where we work
A tight radius, because buildings differ more than cities do.
Attached-housing work depends on knowing how particular associations and particular buildings operate — where the loading bay is, when the board meets, which managing agent answers email. That knowledge does not travel.
Rivermark
North Santa Clara
Santa Clara
North San Jose
Alviso
Berryessa
Milpitas
Sunnyvale
Mountain View
Outside that list, call anyway — if we cannot take it on we will usually know who can.
Managers and boards
If you look after a property rather than live in one, say so on the first call. We will send insurance certificates and a licence copy up front, work to your vendor requirements, and give you a written scope in a form you can circulate.
We are also happy to be the contractor who tells an owner that what they want is not permitted. That conversation is easier coming from us than from you.
On emergency cover
We do not advertise 24-hour service. A small shop cannot staff it honestly. The phone is answered from eight, overnight messages are returned first thing, and a unit with nothing at all with somebody living in it goes to the front of the day.
07
07 — Common questions
Asked on nearly every site visit.
Do I need HOA approval to replace my air conditioner?
Almost certainly, if anything about the job is visible from outside your unit or touches common area — which includes the outdoor unit, the roof, a balcony, an exterior wall penetration and usually the line route. What the association requires varies enormously between one property and the next, so we ask for your governing documents at the first visit rather than guessing. What we do not do is start work and hope nobody notices.
My neighbour can hear my system. Is that fixable?
Usually, and it is usually not the machine. Noise across a shared wall or floor is nearly always structure-borne: equipment bolted hard to framing, ductwork touching a stud, a line set strapped rigidly to a joist. The fix is isolation — pads, flexible connectors, and breaking the direct path — rather than a quieter unit. We would look at that before anybody buys new equipment.
Where can the outdoor unit go if I have no yard?
In this housing stock it is usually a roof, a podium deck, a balcony or a small designated pad — and which of those is available is set by the building, not by preference. Each one brings its own constraints: access, weight, drainage, vibration into the structure below, and the association's rules. We establish which you have before we discuss equipment at all.
Can you work in an occupied building with neighbours either side?
Yes, and it is what we do. It means agreeing working hours with the management, booking the lift or the loading bay in advance, protecting corridors and lobbies rather than just the unit, and not leaving equipment in common area overnight. We put all of that in writing before the first day.
Which areas do you cover?
North Santa Clara and Rivermark, the rest of Santa Clara, north San Jose and Alviso, Berryessa, Milpitas, Sunnyvale and Mountain View. A tight radius, because attached-housing work depends on knowing how particular associations and particular buildings operate.
Send us the building, not just the problem.
The unit number, the floor, and whether there is an association. That is enough to know what kind of visit this is.
