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SIMON MACK ARCHITECTURE

Office Do with a ball in its mouth

Planning a House Extension or New Build Project?
Getting in touch with an architect is a big step on your part so let us tell you about what we do and why we do it. Simon Mack Architecture provides expert architectural design services for residential extensions and new homes across Oxfordshire, Berkshire and Buckinghamshire. We specialise in residential projects, delivering bespoke, detailed designs that maximise space, minimise construction changes, and keep your project on budget. We love helping to create happier, healthier homes.
Why do you need an architect?
Our architectural services guide you through every stage, from initial design concepts and planning permission to construction management and completion. We design from the inside out, creating homes and extensions that are curated around the way you live, with meticulous attention to buildability and detail.
Whether you're planning a contemporary house extension, a complete home renovation, or a new-build house, our experienced team ensures your vision becomes reality. As a RIBA Chartered Practice you can be sure of our excellent professionalism and up to date knowledge of regulations, technology and materials.
Below are our most frequently requested architectural services:

Why choose full project management?

Having Simon Mack Architecture oversee construction provides crucial quality control. We review contractor work, approve materials before purchase, certify payments, and ensure every detail matches your approved design. This oversight minimises costly variations, prevents contractor errors, and gives you confidence that your investment is protected.

We build strong relationships with our clients throughout the journey from first sketch to finished home and we genuinely love being part of that process.

Ideal for: New house builds, large extensions, and whole-house renovations across Henley-on-Thames, Oxfordshire, Berkshire, and Buckinghamshire.

Ready to Start Your Project?

Investing in your home is the exciting next step. Whether you need planning drawings for a home extension, full Building Regulations specifications, or complete project management from design through to construction, Simon Mack Architecture delivers the expertise and attention to detail that high-value projects demand.

Based in Henley-on-Thames, we've spent years perfecting our approach: designing from the inside out to create homes that work beautifully for how you live, with technical drawings so detailed that contractors can build exactly what you envisioned, minimising changes, delays, and budget surprises.

Get in touch for your free consultation:

Phone: 01491 526525

Email: simon@simonmackarchitecture.com

Visit:1 Broadgates, 47 Market Place, Henley on Thames, RG9 2AD.  A quirky listed building and former pub,  next to the Town Hall.

Architectual plans and a tea pot

Free Consultation to Start Your Project with Expert Advice

Thinking about extending your home or building a new house in Oxfordshire, Berkshire, or Buckinghamshire? We offer a complimentary 30-minute consultation to discuss your architectural project, get to know you and explore what's achievable.

During your free consultation, we'll:

  • Assess your plot’s requirements or your property's potential for extension or renovation

  • Discuss planning constraints and opportunities specific to your local council

  • Discuss initial design ideas tailored to how you use your space

  • Outline realistic budgets and timelines

  • Explain the architectural design and planning process

This no-obligation meeting gives you clarity on your project's feasibility before any commitment and gives you a chance to meet the team including our spaniel, Sam, a very important part of our team. Whether you're considering a kitchen extension, loft conversion, rear extension, or complete new build, we'll help you understand the possibilities.

Book Your Free Consultation 

Call us at 01491 526525 

Email: simon@simonmackarchitecture.com or visit our friendly Henley-on-Thames studio, beside the Town Hall.

Building Blocks

Planning Permission Applications

Securing planning permission for your house extension or new build requires detailed architectural drawings, local planning knowledge, and a design that meets both your needs and council requirements.  Our fifteen years of 100% local planning success is proof of our critical experience.

Our planning application service covers the complete design and submission process:

  • Site analysis and feasibility: Understanding your property's constraints and opportunities within the Oxfordshire, Berkshire, or Buckinghamshire planning policy

  • Design brief development: Detailed discussions about how you want to live in and use your space

  • Concept design: Initial architectural proposals showing layout, room flow, and external appearance

  • Planning application preparation: Complete drawings, documents, and submission to your local planning authority

We have extensive experience with South Oxfordshire District Council, Wokingham Borough Council, Buckinghamshire Council, and other local authorities across the Thames Valley. Our detailed approach means we understand local planning requirements, design constraints, and how to present applications that demonstrate compliance while achieving your vision.

Throughout the process, we listen carefully to understand exactly how you want to use your home. By designing from the inside out, we create spaces that work for your daily life and then develop the architecture around those needs.

Render of an architectual plan

Planning Permission and Building Regulations

For clients who want complete architectural drawings ready for building regulations submission, we provide both planning permission and Building Regulations approval in one comprehensive service.

This complete design package includes:

  • Planning application: Detailed architectural designs and submission to secure planning permission

  • Building Regulations drawings: Comprehensive technical specifications covering areas such as structure, insulation, fire safety, drainage, and energy efficiency

This service is ideal for those who wish to manage the tender and build process themselves. For house extensions, new builds, and major renovations in Oxfordshire, Berkshire, and Buckinghamshire.

Building Site

Full Architectural Service: From Design to Completion

Our complete architectural service manages your entire project from initial concept through to construction completion and handover. We remain your dedicated design team throughout, ensuring your home extension or new build is constructed exactly as designed, on budget, and to the highest quality.

What's included in our full service:

  • Design development: Creating detailed architectural plans that reflect how you want to live

  • Planning permission: Application preparation and liaison with your local planning authority

  • Building Regulations: Technical drawings and approval for construction

  • Tender process: Helping you select the right contractor with competitive pricing, we have built relationships with many great contractors over the last 15 years and as your architect we work in your interest to find the right option for you

  • Contract administration: Managing the building contract to protect your interests

  • Site visits and inspections: Regular monitoring to ensure quality and compliance with drawings

  • Problem-solving: Addressing any construction challenges that arise

  • Sign-off and handover: Final inspections and completion certificates

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