Architect-only vs multidisciplinary feasibility - when each works
Architect-only feasibility is the cheaper, faster option. It works for the simplest single-element schemes; for CIF and SRP work it leaves Cost Plan A, M&E adequacy and planning risk unowned.
When architect-only is enough
Stage 0 strategic options. Single-element schemes (e.g. window replacement) where a competent architect can pull together a budget cost. Small extensions below 200m² GIA on uncontested sites.
What architect-only leaves unaddressed
Cost Plan A under NRM1 (needs QS). M&E adequacy (needs engineer). Structural feasibility on alterations (needs structural engineer). Planning pre-app on contested sites (needs planning consultant). Embodied carbon (needs sustainability consultant).
Fee delta
Architect-only Stage 0-2 primary £8,000-£16,000. Multidisciplinary Stage 0-2 primary £18,500-£32,500. Roughly 2x for a substantially more defensible bid pack.
Does CIF / SRP require multidisciplinary
Not by rule, but in practice yes: CIF Section C wants a fundable cost narrative (needs QS) and condition evidence (needs surveyor); SRP DfE-appointed feasibility is always multidisciplinary [source: CIF 2025-26 guide, verified 2026-06-24].
Risk profile
Architect-only carries higher uncovered risk on cost, planning and engineering. Above £200k construction value the multidisciplinary fee is normally the cheaper option after risk-adjustment.