Architecture studio · Ghent

Studio Kervel puts a budget in front of clients at concept stage

Nine people doing residential renovation and extension work, where the most damaging conversation is the one about money that happens six weeks too late.

6 weeks → 1 day
to a first budget
±7%
vs. final contractor price
2
redesign rounds avoided
31
concepts costed last year

The problem

A client approves a concept, the studio develops it, a contractor prices it, and the number comes back 30% over what the client had in mind. Everyone then spends two rounds cutting a design that was never affordable — unpaid work for the studio and a bruised relationship with the client.

What changed

Concept plans go into Joffers as soon as they are drawn. The scope that comes back is coarse by design at that stage — areas, volumes, room-by-room finishes — but it is priced against regional rates, so the studio can tell a client that this version lands around €240,000 while the one with the glazed rear lands around €310,000.

As the drawings develop, the same project is re-run. The estimate tightens with the design instead of arriving at the end of it, and the studio can show exactly which decision moved the number.

“Cost used to be the thing we found out about. Now it's a material we design with.”

Partner, Studio Kervel

The result

Concept budgets have tracked within roughly 7% of the contractor's eventual price, which is close enough for clients to make decisions on. Two redesign rounds per project have disappeared, and the studio now offers the early cost picture as a paid part of concept work rather than a favour.

The budget the client saw
Studio Kervel
Concept budget · Woning D., rear extension 48 m²
Option A vs. option B · excl. VAT and fees
concept stage · ±10%
Work packageOption AOption B
Structure & shell€78,400€86,200
Glazing & external doors€21,600€61,300
Roof & insulation€34,900€36,400
Internal finishes€52,300€58,700
Services (MEP)€53,100€67,800
indicative total€240,300€310,400

Exported from Joffers · figures illustrative

Cost the concept while it can still change.