Manual isolation valves at key points

Lets a leak or failure be isolated to one section rather than shutting off the whole system.

Cost

Low

Upkeep

Occasional

Skill to build

Basic

Lifespan

20-30 years for quality brass/bronze valves before seals need replacement; cheaper plastic valves fail sooner

Embodied carbon

Low

Space / material use

Low

Output timing

On-demand/controllable

Skill to repair

Basic

Note: Cost, carbon and footprint are rated against the other options for this same need, not in absolute terms.

Inputs

none

Outputs

none

Sources

• General plumbing-valve industry durability consensus

What this page does not tell you

No sizing or quantities: how much a technique yields, and how much a household needs, both depend on the build and the people, so the catalogue compares options rather than dimensioning them. It carries no bill of materials and no build sequence, and it is written for an oceanic, clay-soil climate (Normandy, France). Regulatory notes are indicative and need confirming locally.