hard · flats · 2 storeys
B0015: a fourplex on a 14.3 × 19.9 m lot
4 dwellings, 22 rooms. The pooled front across all methods holds 47 nondominated designs.
Requirements
- Lot
- 14.3 × 19.9 m (285 m²)
- Street side faces
- 285° (0 = north)
- Setbacks front / rear / left / right
- 3.1 / 4.4 / 1.5 / 1.5 m
- Storeys × height
- 2 × 2.8 m
- Shared core
- yes (access gallery + stair)
- Open space, net of parking
- ≥ 25% of the lot
- Parking spaces
- 2
- Courtyard
- not required
- Tightness (programme / buildable volume)
- 0.822
Programme
| Dwelling | Type | Storey | Min m² | Rooms |
|---|---|---|---|---|
| U0 | 1BR | 0 | 46 | entry, living, kitchen, bathroom, bedroom primary |
| U1 | 1BR | 0 | 46 | entry, living, kitchen, bathroom, bedroom primary |
| U2 | 2BR | 1 | 63 | entry, living, kitchen, bathroom, bedroom primary, bedroom secondary |
| U3 | 2BR | 1 | 63 | entry, living, kitchen, bathroom, bedroom primary, bedroom secondary |
Required contacts: entry–living, kitchen–living. Doors forbidden between: entry–bedroom_primary, entry–bedroom_secondary, kitchen–bathroom.
Results by method
| Method | Solved | HV | Evals | s | Notes |
|---|---|---|---|---|---|
| Heuristic | 0% | 0.000 | 551 | 1.6 | |
| Random search | 0% | 0.000 | 1500 | 4.6 | |
| Simulated annealing | 0% | 0.000 | 1500 | 4.7 | |
| NSGA-II | 0% | 0.000 | 1500 | 5.4 | |
| CP-SAT | 0% | 0.000 | 0 | 0.2 | solver infeasible |
| Random sketch + repair | 0% | 0.000 | 1500 | 5.1 | repair collapse |
| Heuristic-seeded NSGA-II | 67% | 0.050 | 1500 | 5.2 | repair collapse |
Mean over 1 seeds (the heuristic is deterministic: one run).
Representative designs from the pooled front
Each is best on one objective, or the knee: the most balanced trade-off. None is best overall.
Closest attempts that failed
For methods that found nothing feasible: their least-infeasible design, with its violations marked on its page.
Pareto explorer
Loading designs…
Convergence on this brief
Archive hypervolume against evaluations, mean over seeds.
What stopped designs here
| method | C04 | C05 | C06 | C07 | C08 | C09 | C10 | C11 |
|---|---|---|---|---|---|---|---|---|
| Heuristic | 24% | 59% | 10% | 99% | – | 2% | 1% | 2% |
| Random search | 100% | 100% | 100% | 100% | 43% | 98% | 100% | 98% |
| Simulated annealing | 80% | 99% | 96% | 98% | 12% | 94% | 92% | 71% |
| NSGA-II | 77% | 100% | 98% | 100% | 8% | 80% | 99% | 68% |
| Random sketch + repair | 81% | 98% | 94% | 97% | 7% | 96% | 75% | 59% |
| Heuristic-seeded NSGA-II | 43% | 78% | 29% | 89% | 5% | 19% | 33% | 20% |