Outcome learning loop
DEVELOPMENT PERFORMANCE
Compare original appraisals with latest forecast and actual outcomes, then feed reviewed variance evidence back into Development DNA.
Original appraisal
£1,740/m²
Build cost · Riverside Park
Latest forecast
£1,812/m²
Build cost · Riverside Park
Actual outcome
£1,792/m²
Final account · VERIFIED
Variance review · Riverside Park
Build cost
+3.0%
Substructure scope
Programme
+1.1 mo
Utilities sequence
GDV
+2.4%
Release pacing
External works
+8.1%
Retaining requirement
What DevDNA learned
On comparable housing-led schemes, verified Riverside Park outcome evidence indicates that retaining and utilities scope should be treated as a higher-uncertainty external-works allowance. This evidence informs the relevant Development DNA benchmark; it does not automatically overwrite an appraisal.
Evidence: Riverside Park final account · 124 homes · 2022–2025 · HIGH confidence