easy · flats · 2 storeys
B0018: a adu pair on a 17.5 × 21.8 m lot
2 dwellings, 13 rooms. The pooled front across all methods holds 585 nondominated designs.
Requirements
- Lot
- 17.5 × 21.8 m (382 m²)
- Street side faces
- 240° (0 = north)
- Setbacks front / rear / left / right
- 3.8 / 6.6 / 2.1 / 2.4 m
- Storeys × height
- 2 × 2.8 m
- Shared core
- yes (access gallery + stair)
- Open space, net of parking
- ≥ 38% of the lot
- Parking spaces
- 1
- Courtyard
- not required
- Tightness (programme / buildable volume)
- 0.470
Programme
| Dwelling | Type | Storey | Min m² | Rooms |
|---|---|---|---|---|
| U0 | 3BR | 0 | 84 | entry, living, dining, kitchen, bathroom, bedroom primary, bedroom secondary, bedroom secondary |
| U1 | 1BR | 1 | 46 | entry, living, kitchen, bathroom, bedroom primary |
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 | 463 | 1.0 | |
| Random search | 0% | 0.000 | 1500 | 3.3 | |
| Simulated annealing | 100% | 0.167 | 1500 | 3.5 | |
| NSGA-II | 100% | 0.196 | 1500 | 4.8 | |
| CP-SAT | 100% | 0.215 | 26 | 6.7 | |
| Random sketch + repair | 100% | 0.210 | 1500 | 5.4 | repair collapse |
| Heuristic-seeded NSGA-II | 100% | 0.159 | 1500 | 5.6 | 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 | 2% | 16% | 47% | – | – | – | 2% | 100% |
| Random search | 55% | 96% | 76% | 52% | 13% | 72% | 75% | 91% |
| Simulated annealing | 27% | 60% | 53% | 10% | 8% | 46% | 26% | 45% |
| NSGA-II | 18% | 58% | 43% | 10% | 7% | 27% | 34% | 47% |
| Random sketch + repair | 26% | 59% | 47% | 7% | 9% | 24% | 38% | 47% |
| Heuristic-seeded NSGA-II | 19% | 50% | 58% | 8% | 2% | 19% | 24% | 30% |