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Elmstone Architectural Ltd

Friendly, Client-Focused Practice

13 Charles Rd, Cowes, PO31 8HG Directions

Tel 07837 876284
   Now closed Open today 09:00 - 17:30

Why Choose Us?

Quality Service
Many Years Experience
Well Established

Here at Elmstone Architectural Ltd, we pride ourselves on our reputation

Business overview

Architects from the Isle of Wight who have been looking after local people since 2010

Sean Macmillan Architecture, formed in 2014, is a friendly, client-focussed practice, using considered thinking to make sure proposed designs match client and planning authority requirements, whilst providing aesthetic design sympathetic to individual budgets. Our architectural designs cover a wide range from contemporary modern through to more traditional.

We work on residential, conservation and commercial projects, large or small, from extensions and refurbishments, hard-surface landscaping space design, interior design, bespoke new builds and housing schemes through to designing for the commercial, retail and education sectors.

Why Choose us?

*1 Free Hour Consultation

*Friendly and Professional Service

*Chartered Architects

*Qualified since 2001


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Products & Services

Architectural and Engineering Models

Architectural Services

Architecture Design

Building Consultants

Building Design

Building Conversions

Building Plans

Building Refurbishments

Building Space Planning

Commercial Architects

Draughting Services

House Extensions

Interior Architects

Listed Buildings


Planning Appeals

Planning Applications

Planning Consultants

Principal Designers


Residential Architects

RIBA Member

Sustainable Design

Town Planning Consultants

Urban Design

Building Regulations



  • Isle of Wight Conservation Society: Landscaping Award 2017 - Winner


  • Architects Registration Board


  • RIBA


  • Architecture, MSc (University Level Qualification)

Our Team

Sean Macmillan - Director and Architect

Joined in

Sean is a fully qualified Chartered RIBA Architect with 20 years experience in both large and small projects, from concept to completion.¶Sean worked as project Architect on a wide range of projects including a 130 unit and a 86 unit residential apartment development in Guildford and Brighton respectively.¶Sean has won several awards from RIBA IW and the IW Society.

Ms Amy Boudewijn - Office Business Manager

Amy has a BA (Hons) in Business and ensures the smooth running of the office, manages the day-to-day activities within the business and liaises with clients, the design team and stakeholders such as planning officers. Amy is also an AAT Licenced Accountant.

Mr John Sutton - Structural Engineer

Joined in

John is an Architectural Engineering with 20+ years construction experience. He has worked in many structural engineering consultancies in the commercial, retail and residential sectors from refurbishment work in historic buildings to new build multi storey office developments as a Structural Engineer.

Mr Adrian Henretty - Architectural Technologist

Adrian joined as a Partner in February 2014 bringing with him specialisms in Building Regulations, Project Management and Health and Safety. Adrian previously works in a multi-disciplinary consultancy where he gained a degree in Architectural Technology and has over 11 years’ experience in residential, commercial and educational projects.


House rebuild and extension

From the start of the project, we liked the way Sean engaged with us to ensure our vision of what we wanted turned into the practical realities of the build. He was always available to support us when we had concerns during construction or just wanted to talk out a new idea.

Our home is now complete, and we are very happy with it. This was our first major house project, so we relied very heavily on Sean guiding us through each step. Highly recommended!
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Total confidence in this company.

Sean provided an excellent and professional service in all the dealings with my conversion. From plans to completion.
I am now living in a wonderful home, that he has helped create. I would recommend them.
Thank you
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Highly recommended architectural and project management services, attuned to our needs

Sean took time understanding what we wanted and preparing detailed drawings for review and editing or agreement pre-submission to planners. Close liaison with builders throughout the project and pertinent comments at the pre-tender/tender stage re reasonableness of tenders.

Prepared to support us as clients where (unusually) builders' or sub-contractors' work below standard. Flexible where our thoughts havered/developed during the process.

Sean's knowledgeable and charming PA was very good on monitoring emails, keeping us aware of developments and up dated on issues (eg his likely turnround time allowing for other projects, availability for meetings) so managing our/ but responding to expectations appropriately.

We particularly appreciated Sean's attention to detail and ability to project manage the job (for which we thought his fees were very reasonable) on our behalf. It was helpful that he could draw on the skills of structural engineers with whom he regularly works.
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Responsive and constructive architectural practice

We were very impressed by the service we received from Sean and his colleagues. They worked with us closely, liaising effectively with builders and planners, to ensure an excellent outcome. Inevitably some changes needed to be made along the way, but they made constructive suggestions and necessary amendments to ensure that the final result met our needs.
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After speaking with several architects about our house renovation, remodelling and extension project we decided Sean Macmillan had the best understanding of our initial ideas. Working with Sean has been a very good experience, giving us the confidence to invest in our home. Sean dealt with the inevitable challenges along the way with thoughtful solutions and have helped us realise our vision for a comfortable home, designed to meet our needs.

- Source: Mr & Mrs Staughton, Limerstone.

I had a very helpful call the next day. We arranged a home based provisional meeting and then agreed a full survey with plans. The initial one hour consultation was free which is very good value for no money! To date we have made good progress and feel very optimistic about our project.

- Source: Peter, Shanklin.

I was recommended to use your practice by a friend who works in the building trade and whose colleague spoke well of you. I was very happy with the service provided and the outcome and was reassured by your supervision of the construction works.

- Source: Mr. N. Jackson, Ventnor.