easy · flats · 2 storeys
B0023: a triplex on a 13.5 × 27.4 m lot
3 dwellings, 15 rooms. The pooled front across all methods holds 713 nondominated designs.
Requirements
- Lot
- 13.5 × 27.4 m (370 m²)
- Street side faces
- 315° (0 = north)
- Setbacks front / rear / left / right
- 3.7 / 5.6 / 2.2 / 2.4 m
- Storeys × height
- 2 × 2.8 m
- Shared core
- yes (access gallery + stair)
- Open space, net of parking
- ≥ 37% of the lot
- Parking spaces
- 0
- Courtyard
- not required
- Tightness (programme / buildable volume)
- 0.474
Programme
| Dwelling | Type | Storey | Min m² | Rooms |
|---|---|---|---|---|
| U0 | studio | 0 | 33 | entry, living, kitchen, bathroom |
| U1 | 1BR | 0 | 46 | entry, living, kitchen, bathroom, bedroom primary |
| U2 | 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 | 100% | 0.155 | 351 | 1.2 | |
| Random search | 0% | 0.000 | 1500 | 3.0 | |
| Simulated annealing | 100% | 0.099 | 1500 | 2.8 | |
| NSGA-II | 100% | 0.116 | 1500 | 4.2 | |
| CP-SAT | 100% | 0.077 | 12 | 6.6 | |
| Random sketch + repair | 100% | 0.127 | 1500 | 4.4 | repair collapse |
| Heuristic-seeded NSGA-II | 100% | 0.179 | 1500 | 6.1 |
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 | 12% | 41% | 23% | – | – | 1% | 1% | 1% |
| Random search | 35% | 100% | 100% | 22% | 15% | 84% | 92% | 82% |
| Simulated annealing | 34% | 72% | 71% | 22% | 15% | 49% | 31% | 56% |
| NSGA-II | 18% | 64% | 57% | 9% | 7% | 36% | 26% | 35% |
| Random sketch + repair | 37% | 59% | 48% | 8% | 14% | 23% | 38% | 54% |
| Heuristic-seeded NSGA-II | 25% | 51% | 41% | 5% | 3% | 26% | 19% | 21% |