We're talking bespoke frame-building, right? With almost unlimited possibilities, the exact cost of a project will depend on build specification. That said, a custom-built frameset can be built to a set specification and price. Standard spec: fillet-brazed Columbus Zona tubeset, Columbus SL fork blades, double water bottle cage bosses, stainless steel head badge and gear cable rubbing strips and one-colour paint finish including down tube decals.
Fast Road frame and fork from £995 - can be fitted with a Columbus Minimal or similar carbon-fibre fork - please ask for details.
Super Audax frame and fork from £1100 - with rear rack and mudguard bosses.
650 Adventure or Sport frame and fork from £1150 - build spec. as standard Fast Road frame and fork, with cantilever brake fittings and mudguard and rack bosses.
Road Tour frame and fork from £1150: build spec. as standard Fast Road frame and fork, with cantilever brake fittings and mudguard and rack bosses.
Track frame set from £950 - can be specified with carbon-fibre fork - please ask for details.
Bi-laminate bottom bracket - add £175
Bi-laminate main triangle - add £175
Part-polished stainless steel fork blades, rear stays and dropouts - from £350
Reynolds 953/921, KVA or Columbus XCR - from £1950
Many other options including rear ends suitable for Rohloff or Shimano hub gearing are available; please ask for details and prices.