Plumbing: The Choices Worth Making Deliberately

Plumbing is invisible until it fails, which is why it gets decided by default. During a remodel you get one cheap opportunity to make choices that otherwise cost a fortune, and most people spend it thinking about tap finishes.

For the work itself, see plumbing.

The layout question: how far can a fixture move?

Water can go almost anywhere. Drainage cannot — it runs downhill at a required fall, and it needs venting. That is why moving a sink is usually simple and moving a toilet is usually not.

Sinks and basins move relatively easily.
Showers and baths depend on where the drain can fall to.
Toilets are the least forgiving fixture in the house.
Anything on a slab multiplies the cost, because relocating a drain means cutting concrete.

This is why we ask where the existing lines run before a layout is settled. Moving a fixture on paper is free; moving it after the slab is cut is not.

Repipe while the walls are open, or not at all

If the house has galvanised steel supply pipes, they are corroding from the inside and the question is when, not whether. Repiping during a remodel, while walls are already open, costs a fraction of doing it as its own job with all the making-good that involves.

This is the single clearest example of the principle behind all these pages: the work is not expensive, the access is. If you are opening walls anyway and the pipework is old, do it now.

Water heating, which is a bigger decision than it looks

Conventional tank. Cheapest to install, takes floor space, finite hot water.
Tankless. Endless hot water, takes no floor space, needs a larger gas supply or a substantial electrical circuit, and often a new flue. Retrofitting into a house not set up for it is where the cost sits.
Heat pump water heater. Efficient, needs space and air movement around it, and a dedicated circuit.
Recirculation. Hot water arrives quickly rather than after a minute of running the tap. Cheap to add during a remodel, disproportionately noticeable every day.

Pressure, and why the shower disappoints

A shower that underwhelms is usually not the fixture. It is pipe size, an old pressure regulator, or too many fittings served by one undersized line. Replacing a showerhead to fix low flow rarely works. Establishing the actual cause before you buy fixtures saves money and disappointment.

Small decisions with permanent effects

Shut-off valves at every fixture. Trivial during installation; the difference between a small leak and a flooded house.
A whole-house shut-off you can actually reach.
Access panels where anything might need service later.
Insulating hot lines in walls and under floors.
A stub and shut-off for a future outdoor tap, ice maker or bidet.

The requirement that catches people out

Several California cities enforce the state rule that non-compliant plumbing fixtures throughout the house must be replaced with water-conserving ones when a remodel permit is issued — even fixtures nowhere near the work. It varies by city and is worth budgeting for rather than discovering at plan check.

What costs more than people expect

Relocating drainage, especially on a slab.
Tankless conversion in a house not already set up for it.
Whole-house fixture retrofits triggered by a permit.
Opening finished surfaces to reach pipework.

What is cheaper than people expect

Repiping while walls are already open.
Recirculation added during a remodel.
Fixture shut-offs and access panels.
Stubs for future fixtures.

Questions we get asked

Why is moving a toilet so expensive?

Because drainage runs downhill at a required fall and has to be vented, unlike water supply which can go almost anywhere. On a slab, relocating a toilet drain means cutting concrete. Sinks move easily; toilets are the least forgiving fixture in the house.

Should I repipe during my remodel?

If the house has galvanised steel supply pipes, yes. They corrode from the inside and will eventually need replacing. Doing it while walls are already open costs a fraction of doing it later as its own job with all the making-good that involves.

Is a tankless water heater worth it?

It gives endless hot water and takes no floor space. The cost sits in retrofitting — it usually needs a larger gas supply or a substantial electrical circuit and often a new flue. In a house already set up for it, straightforward; in one that is not, it is a real project.

My water pressure is poor. Will a new showerhead fix it?

Rarely. It is usually pipe size, an old pressure regulator, or too many fixtures on one undersized line. Diagnosing the actual cause before buying fixtures saves both money and disappointment.

What is hot water recirculation?

A system that keeps hot water near the fixtures so it arrives in seconds rather than after a minute of running the tap. It is cheap to add during a remodel and one of the things homeowners notice most afterwards.

Why might a permit force me to change fixtures elsewhere in the house?

Several California cities enforce the state requirement that non-compliant plumbing fixtures throughout the house be replaced with water-conserving ones when a remodel permit is issued, whether or not they are in the scope of work.

Tell us about your plumbing project

Send us the basics — what needs replacing or moving, the age of the house, and roughly when you would like to start — and we will come out, take measurements and put a written scope and estimate in front of you within about 48 hours of the visit.

Call (800) 348-3050