Marble and oak kitchen, Greenwich — JHA Studio

Joshua Heasman Architecture

Architectural services

What we offer

A full design and delivery service, from first brief to final handover.

Our architectural services cover residential projects of all scales, alongside commercial and public-facing work. We lead your entire project from first sketch to final handover, managing every RIBA work stage with the same level of senior attention throughout.

We handle the whole process: design, interior design, planning, technical documentation, consultant coordination, contractor procurement, project management and handover. One team, one point of contact, complete transparency.

RIBA chartered and ARB registered. Founder Joshua Heasman trained at Carmody Groarke and was shortlisted for the RIBA Silver Medal.

01
Architecture

Residential extensions and retrofits, new build homes, conservation area and listed building work, and mixed-use projects. We bring the same rigour to every scale.

02
Interior Design

We take a holistic approach to designing a building or space, testing ideas through sketches, material references and visuals. Interior design is offered as part of our full service or as a standalone scope.

03
Planning

We develop a planning strategy for every project and manage all applications and consents. We work with specialist consultants, including heritage, ecology and structural, coordinating their input and keeping the process on track. We advise on what is realistic from the outset and aim to maintain budget discipline throughout.

04
Project Management

We manage the entire process on your behalf: programme, budget, consultant coordination and contractor oversight. We monitor quality on site, flag risks early and ensure the project is delivered on time and to the standard agreed. You have one point of contact from start to finish.

Selected work

Considered residential architecture across London and beyond.

We work across four areas. Each project is led from first sketch to handover with the same senior attention.

Courtyard House, a Victorian terrace extension in Greenwich — JHA Studio
Extension
Courtyard House

A rear and side extension to a Victorian terrace, organised around a sheltered courtyard garden. Greenwich.

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North London Villa, a two-storey extension and retrofit — JHA Studio
Retrofit & extension
North London Villa

A two-storey extension and full low-energy retrofit of a Victorian villa, on site in 2026. North London.

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The Clock House, a Grade II listed building in Ripley, Surrey — JHA Studio
Listed & conservation
The Clock House

Sensitive repair and reuse of a Grade II listed building, in close dialogue with the local authority. Ripley, Surrey.

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A new build villa on the south coast of Lombok, Indonesia — JHA Studio
International new build
Indonesia

A new build villa above the bay on the south coast of Lombok, designed for a tropical climate.

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Our process

RIBA work stages 1–6, fully managed.

Our process follows the Royal Institute of British Architects work stages, providing clarity and transparency at every step. We coordinate all consultants, manage the programme and keep you informed throughout, advising on budget and what is achievable at each stage.

Stage 01
Briefing

We get to know you and your project. We carry out a measured survey, prepare accurate drawings of the existing building and site, appraise planning constraints, develop your brief and establish a realistic budget and outline programme from the outset.

Stage 02
Design

We develop concept options, testing spatial ideas, materials and natural light through sketches and 3D visuals. Options are graded by cost, design ambition and programme. Where useful we appoint a quantity surveyor to prepare a cost plan, and we agree the planning strategy before proceeding.

Stage 03
Planning

We prepare and submit the planning application, including all key drawings and supporting statements. We coordinate specialist consultants where required, seek pre-application advice where it helps, and manage correspondence with the planning authority. A typical determination period is around eight weeks.

Stage 04
Technical

We develop the design into a full technical package of detailed drawings, specifications and schedules. We coordinate the structural engineer, M&E and other specialists, submit for building regulations approval, arrange party wall notices where needed, then prepare tender documents, invite contractors to price and advise on appointment.

Stage 05
Construction

We administer the building contract on your behalf. We inspect work on site at regular intervals, issue instructions and respond to contractor queries, certify payments and monitor cost, quality and programme. A retention, typically five per cent, is held to protect you until the work is complete.

Stage 06
Handover

We issue the certificate of practical completion, which transfers the building to you, along with the documentation and certificates you need. A defects period follows, typically six months, during which the contractor returns to rectify any issues. We then agree the final account and issue the final certificate, closing the project cleanly.

Common questions

What to know before you start.

What does an architect do?
For residential work an architect can lead the whole project, from brief and design through planning and technical drawings to administering the building contract on site. The role can also be limited to particular stages if that suits you better. We explain how an architect can help on our journal.
What is included in your architectural services?
Design, interior design, planning, technical documentation, consultant coordination, contractor procurement, project management and handover. We can provide the full service across RIBA work stages 1 to 6, or a defined scope to suit your project.
Can I appoint you for just one stage?
Yes. Many clients engage us for the full process, but we also take on limited appointments, for example planning only, or a survey and design package. We will advise on the most sensible scope for your project.
How long does a project take?
It depends on scale and planning. As a guide, design and planning often take a few months, with a typical planning determination of around eight weeks, followed by technical design and construction. We set out a realistic programme at the briefing stage.
What areas do you work in?
We are based in London and work across the city and the wider UK, with selected international projects.
How much do your architectural services cost?
Fees depend on the scope and complexity of the project. We discuss budget and fees openly at a free initial consultation, with no obligation. Get in touch to arrange one.
Get in touch

Have a project to discuss?

Whether your project is fully formed or just an idea, we are happy to have an initial conversation. No obligation, no cost, and a clear sense of budget and the right scope before you commit. We work with clients across London, the UK and internationally.

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