Theon Design bespoke Porsche 964 in dark olive green studio shot

"The Theon is just a little more raw than the Singer, less constricting than the Gunterwerks, less overwhelmingly powerful than the RUF — but felt perhaps the best balanced of all those."

Robb Report

House Brand

Theon Design

Deddington, Oxfordshire · Est. 2016

The most obsessively engineered air-cooled Porsche 911 in the world. Each build takes 18–24 months and over 6,000 hours. Six to eight are made each year. Every one is completely different.

964Platform
6,000+Hours per build
6–8/yrProduction
$795k+All-in U.S. price
Humble House · House Brand Partner U.S. enquiries exclusively through us
About Theon Design

Built by a car designer who couldn't find what he was looking for.

Adam Hawley and Lucinda Argy founded Theon Design in 2016 — named after their son, Theo. Adam had spent years designing cars for some of the world's most prestigious automotive brands. When he couldn't find a 911 built to the standard he expected, he built one himself. That car became the blueprint for everything that followed.

Operating from a converted workshop in the Oxfordshire countryside, Theon works exclusively on the Porsche 964 — the generation of the 911 built between 1989 and 1994. Every component is digitised and 3D modelled to tolerances tighter than the original factory specification. Carbon fibre body options, bespoke engine builds, and 300-hour paint programmes are standard territory. No two builds are alike.

Theon describes their approach as OEM+ — the robustness and precision of an original manufacturer, combined with the craftsmanship that only comes from a small, deeply committed team of experts.

Why Theon

What sets them apart.

Engineered to obsessive tolerances

Every component is digitised and 3D modelled. Custom wiring looms are 24kg lighter than factory. The chassis is seam-welded for rigidity. Nothing is off the shelf — and nothing is done to a standard Theon considers acceptable rather than exceptional.

Completely bespoke, every time

Engine displacement, gearbox specification, body configuration, interior materials — every decision is the owner's. The process begins with an in-depth brief and ends with a car that exists nowhere else on earth.

Air-cooled performance, modern capability

Up to 421bhp from a naturally aspirated flat-six. Optional carbon body panels bring weight to 1,150kg — a better power-to-weight ratio than a current GT3 RS, without a single turbo in sight.

Globally sought, rarely available

Clients in North America, Europe, South America and Asia. Build slots typically fill before they're announced publicly. Lead times currently run to two years or more. Demand has consistently outpaced supply since the company's founding.

Build at a glance
PlatformPorsche 911 964 (1989–1994)
Build time18–24 months / 6,000+ hours
Annual productionSix to eight builds per year
Engine options3.6 / 3.8 / 4.0L naturally aspirated flat-six
Power outputUp to 421bhp
BodySteel with optional full carbon fibre panels
WeightFrom 1,150kg (full carbon spec)
Starting priceFrom $795,000 all-in for U.S. (excl. local taxes)
WorkshopDeddington, Oxfordshire, UK
Commission a Theon Design

Tell us about
your ideal build.

Every Theon is completely different. Tell us what you have in mind — we'll guide you through every step from initial specification to delivery at your door in the U.S..

All-in for the U.S.

From $795,000 including donor car, build, shipping and import. Local taxes only excluded.

White glove concierge

Humble House manages everything — specification, liaison with Theon, logistics and delivery stateside.

Build time 18–24 months

Starting the conversation now is the first step. Build slots are limited.

We respond within 48 hours. All enquiries are handled with complete discretion.