Investment & Budget Guide

An honest conversation about what your project will cost.

Below are realistic investment bands for the work we do across Buckinghamshire, drawn from projects we have completed in the last twenty-four months. The numbers are deliberately specific so serious clients can self-assess — and so we can both have a straight-talking first conversation.

Architectural drawings, brass scale rule and project specification on a walnut studio desk

Refined

£80,000 – £200,000

From £2,800 / m²

Single-storey rear or side-return extensions, premium kitchen-diners, well-finished garage conversions, larger loft conversions in lower-cost postcodes.

Typical Commissions

—30–55m² ground-floor extension with bi-fold or sliding doors
—Full hip-to-gable loft with ensuite and dormer
—Double-garage conversion to studio, gym or annexe
—Kitchen-led ground-floor reconfiguration

What's Included

Full plans-and-Building-Control package, structural steels, twin-skin cavity masonry, warm roof, mid-range aluminium glazing, underfloor heating, mid-tier joinery and finishes, full snag and 10-year guarantee.

Most Common In

Aylesbury, High Wycombe, Chesham, Wendover, Princes Risborough and the wider Vale of Aylesbury.

Substantial

£200,000 – £400,000

£3,000 – £3,600 / m²

Two-storey extensions, wrap-around extensions, whole-floor refurbishments, principal-suite lofts, basement light wells, full-house re-services.

Typical Commissions

—Two-storey rear or side extension with new principal suite above
—Whole-house refurbishment with new kitchen, bathrooms and re-wire
—Premium loft conversion with vaulted ceilings and balcony
—Ground-floor remodel with structural opening-up and new stair

What's Included

Coordinated architectural & structural design, premium aluminium or steel-look glazing, MVHR or zoned UFH, bespoke in-house joinery (kitchen, wardrobes, panelling), engineered stone or natural-stone finishes, Lutron-class lighting controls, full smart-home cabling spine.

Most Common In

Beaconsfield, Amersham, Gerrards Cross, Chalfont St Giles, Penn, Knotty Green, Great Missenden, Marlow.

Luxury

£400,000 – £500,000+

£3,600 – £4,500 / m²

Whole-house remodels, new-build replacement dwellings, basement excavations, Grade-listed restoration, contemporary glass-led architectural commissions.

Typical Commissions

—Substantial demolition and replacement new-build home
—Whole-house remodel with basement dig and rear extension
—Sensitive Grade I or II listed restoration with M&E modernisation
—Architect-led contemporary remodel with structural glass and bespoke metalwork

What's Included

Director-held design-and-build contract, Schüco / Sky-Frame-class glazing, Passive-House detailing where specified, ground-source heat pumps, full smart-home and AV integration, hand-finished bespoke joinery throughout, natural-stone and marble specification, dedicated QS and contracts manager.

Most Common In

Beaconsfield Old Town, Gerrards Cross, Chalfont St Peter, Stoke Poges, Burnham Beeches and surrounding private estates.

Stage Payments

You pay as we build — never ahead of it.

A typical Bespoke stage-payment schedule. Every stage is certified complete (and where appropriate, signed off by Building Control) before the invoice is raised. Final 10% is held back to handover.

On contract signature: 5%
Site set-up & strip-out: 10%
Foundations & oversite complete: 15%
Masonry shell to wall-plate: 20%
Weather-tight (roof & glazing): 20%
First & second fix complete: 20%
Snag-free handover: 10%

Where does your project sit?

Tell us a little about it and we'll come back within one working day with an indicative band — before either of us spends a penny on drawings.

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