Active, monitored composting of solids to pathogen-safe compost rather than pump-out disposal.
Cost
Low
Upkeep
Frequent
Skill to build
Basic
Lifespan
Composting bin/structure: 15-25 years depending on material (timber vs. block)
Embodied carbon
Low
Space / material use
Medium
Output timing
Continuous process
Skill to repair
Basic
Regulation (FR example)
Dry toilets are explicitly permitted (arrete du 7 septembre 2009 modifie) but must be declared to the SPANC, and byproducts must be composted on the property without any discharge or nuisance to neighbours.
Note: Cost, carbon and footprint are rated against the other options for this same need, not in absolute terms.
General composting-infrastructure 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.