Loft conversion with large rooflight

Ellis House by BUF Architecture. Photo by Edmund Sumner.

Do I Need An Architect?

There is no legal requirement to appoint an architect in the UK. However, if you are building an extension or making major internal changes, they can help you maximise design potential, secure planning permission and manage the work on site.

Aron Coates, Architect, BA(Hons), BArch, ARB | Designs in Detail | Updated September 2024


When planning a home renovation or extension, deciding whether to hire an architect is one of the most important early decisions you’ll make. While not legally required in the UK, having an architect on board can dramatically improve the design, quality, and outcome of your project. This article explores when an architect is essential, the benefits they bring, and when you might be able to manage without one.

What is an Architect?

The title ‘architect’ is legally protected in the UK. This means that only those registered with the  Architects Registration Board (ARB) can use the title. Architects are highly qualified professionals who design and oversee the construction of buildings. Becoming an architect requires seven years of rigorous training – five years at university followed by two years of practical experience.

Many architects also choose to become chartered members of the Royal Institute of British Architects (RIBA), a professional body that promotes the highest standards in architecture.

READ: Architect vs architectural designer – what’s the difference?

When should you consider using an architect?

While some homeowners manage projects without an architect, there are situations where professional expertise is invaluable.

  • Structural Changes: For major alterations like rear extensions, loft conversions, or basement excavations, an architect is highly recommended. They ensure that structural changes are safe and comply with building regulations, helping you avoid costly mistakes.
  • Design Expertise: Architects refine and enhance your vision, optimising space, light, and functionality. Even if you have a clear idea, their design input can elevate your project to the next level.
  • Planning Permission: For projects requiring planning permission, or in restricted areas like listed buildings or conservation zones, an architect's knowledge of local planning policies can significantly reduce delays and improve your chances of first-time approval.
  • Technical Expertise: Architects provide detailed construction drawings, specifications, and schedules, and can assist with sourcing the right materials and products.
  • Project Management: If you're unsure about managing contractors, architects can oversee the entire construction process, ensuring the project stays on time, within budget, and meets high standards. They also coordinate with engineers and other specialists as needed.

When you may not need an architect

Not every project requires the involvement of an architect. You may manage without one if:

  • The project doesn’t involve structural changes such as cosmetic upgrades or basic refurbishments.
  • You have a clear vision and prefer to work directly with a trusted builder or designer.
  • The work is simple and straightforward, such as small scale interior renovations.

In these cases, you might consider hiring an architectural technician who offer lower cost alternatives to full architectural services.

Should I just use a builder?

While some homeowners choose to have their builder manage both design and construction, this approach carries certain risks.

In the UK, builders aren’t required to hold formal design qualifications or follow a regulated code of practice. In contrast, architects undergo extensive training and must adhere to a strict code, ensuring their work meets professional standards. Additionally, architects carry Professional Indemnity Insurance, providing clients with protection against potential issues.

For complex projects, hiring an architect is a more secure option.

How much does an architect cost?

Architects typically charge based on the complexity, scope, and location of your project. Common fee structures include:

  • A percentage of the total construction cost, typically around 10–15% for full services.
  • A fixed lump sum.
  • An hourly or daily rate.

While architects’ fees may seem high, they often save you money in the long run by avoiding mistakes, reducing waste, and helping you stay within budget.

READ: How much do Architects Cost in the UK?

Finding and appointing an architect

If you decide to hire an architect, it’s crucial to find one with the right expertise. Begin by searching for practices that specialise in residential projects similar to yours. Ensure they are ARB-registered and consider those who are also members of the Royal Institute of British Architects (RIBA) for added assurance of quality and professionalism.

After shortlisting potential architects, arrange a consultation to discuss your project. This meeting will provide an opportunity to assess whether their approach aligns with your vision and needs.

Once you've chosen your preferred architect, they will formalise the appointment by outlining the scope of work, fees, and timeline in a written contract. This ensures clarity and sets expectations for both parties, paving the way for a successful partnership.

Examples of value

Whether it's a small extension or a bespoke new build, the input of a skilled architect can elevate your project and save you money.

Construction can be an expensive endeavour, but some of the best buildings are created within tight budgets. Architects can transform simple materials and technologies into unique, uplifting environments.

The projects below demonstrate how architects can add value, whether by optimising a constrained site or budget.

House Lessans by McGonigle McGrath Architects. New build house forming part of a Northern Irish farmstead built for the equivalent to the cost of inner-city social housing. Photo by Aidan McGrath.

Pocket House by Tikari Works. Half subterranean home built on a small garage site. Photo by Edmund Sumner.

Ellis House by BUF Architecture. Terrace house extension, refurbishment and landscaping built on a very modest budget. Photo by Edmund Sumner.

New Barn by Rural Office For Architecture. A flexible barn space utilised as temporary home built using utilitarian materials on a tight budget. Photo by Mojo Photography.

The information provided in this article is intended for general guidance and educational purposes only. At Designs in Detail, we advise you appoint a skilled residential architect to provide specific expert advice for your project.


About the author

Aron Coates is an architect with over two decades of experience, encompassing projects ranging from the restoration of historic buildings to the design of contemporary homes.

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