Why Architecture and Interior Design Should Be Planned Together

Glenn Cavill Architecture × Briony Ace Interiors

A great home is never created by one person or one discipline working in isolation. It comes from architecture, interiors and construction being considered together from the very beginning. In this conversation, Glenn Cavill and Briony Ace Interiors explore why the best results happen when the building and the life within it are designed as one.

Briony: For me, you can’t really separate the architecture from the interior. One shapes the other. I want to understand how a room is going to feel before we decide exactly what is going in it: where the light comes from, what you see when you walk through the door, where people naturally gather and where you might sit with a coffee in the morning.

Glenn: I completely agree. Architecture is not simply a container for an interior; it establishes the proportions, rhythm, light and movement that make a home feel the way it does. At the same time, the way a client wants to live should influence those architectural decisions. The plan needs to be tested against real life, not just against a drawing.

Designing the room before it exists

Briony: When I’m involved early, I can think about the home as a whole rather than working around decisions that have already been made. I’m mentally living in the rooms before they exist. Where does the furniture want to sit? What do you see when you walk in? How do you move through the space every day? Once you ask those questions, the plans often begin to shift.

Glenn: That early dialogue is invaluable. It can influence doorways, windows, circulation, storage, lighting and even the orientation of a room. The architectural framework becomes more responsive because we are considering not only how it looks from outside, but how it will support daily life inside.

Briony: I’ve worked on projects where we completely flipped the orientation of a room because, once we put real life into the plan, there was a better way for it to work. One kitchen and dining space was rethought from the inside out, creating a more natural flow, a dedicated bar area, a better utility entrance and a much larger window over the sink. It wasn’t about undoing the architecture; it was about adding another layer of thinking.

Glenn: That is exactly the value of collaboration. A change that begins with furniture or family routines can improve the architecture as a whole. The strongest solutions often emerge when each discipline is willing to challenge the plan constructively.

When interior design is treated as an afterthought

Glenn: Usually the problem is not one enormous mistake. It is a series of small compromises: a beautiful open-plan room with no natural place for the sofa, a pendant that is not centred over the dining table, or a window that leaves nowhere for curtains to stack. Individually these issues may seem minor, but together they affect how resolved a home feels.

Briony: Exactly. I start putting real life into a room very early: furniture, lighting, storage, artwork, curtains and even somewhere to put your coffee. Once those elements are placed on a plan, you see things that are not obvious on an architectural drawing. A room should not only work when it is empty; it needs to work when life moves in.

Glenn: Sightlines are another important test. What do you see through a doorway or from one room into the next? How does the sequence unfold as you move through the home? A small adjustment to an opening, wall or axis can change the balance of the entire interior.

One conversation, not two separate jobs

Briony: The best collaboration feels like one ongoing conversation rather than two separate jobs. We are looking at the same space through slightly different lenses. I’m asking where the sofa goes, where the artwork hangs, how the lighting works at night and what needs to be hidden or celebrated.

Glenn: And I’m considering structure, proportions, materiality, light, acoustics and flow. Those conversations should overlap. If Briony says that moving a doorway would create a much stronger furniture layout, that may lead to a better architectural idea rather than being seen as a problem to solve later.

Briony: Good collaboration is not about protecting individual territories. Everyone brings a different expertise, and everyone’s ideas are worth listening to. The aim is to create the best version of the same home.

Glenn: When that happens, the finished spaces feel effortless. There may have been hundreds of decisions behind them, but the work is not what you notice when you walk through the door. You simply feel that everything belongs where it is.

Light, joinery and the decisions made early

Briony: Light is a huge part of that. I think about how natural light moves through a home throughout the day: where the morning light comes in, which rooms should feel bright and open, and which might be more atmospheric. More glass is not automatically better. You still need walls for furniture, artwork, storage and a sense of enclosure.

Glenn: The architectural decisions around window size, orientation and placement should therefore be made with the interior in mind. Natural light, views and privacy all need to work together. Then artificial lighting can build on that foundation rather than trying to correct it later.

Briony: I want to understand the furniture layout before we decide where every light goes. A wall light needs a relationship with something, a pendant needs to know what it is hanging over and a socket needs to know where the lamp will live. Joinery also affects dimensions, electrics and sometimes the architecture around it.

Glenn: These are the details that are often almost invisible in a beautifully resolved room, yet they are among the most carefully considered. Technical precision and atmosphere are not competing priorities; they support one another.

Building the team before building the home

Briony: My advice to anyone starting a self-build or major renovation is to involve an interior designer earlier than they probably think. You do not need to have selected every chair or cushion before the foundations are in, but you do need to understand how each space needs to work and feel. Moving a socket on a drawing is one thing. Moving it after construction is quite another.

Glenn: I would also encourage clients to choose people, not just roles. The right team needs to communicate openly, listen and enjoy solving problems together. There will be site meetings, last-minute decisions and moments when something does not go to plan. Trust and clarity are as important as a strong portfolio.

Briony: Choose people whose work you love, absolutely, but also people who share ideas and genuinely want to collaborate. You are going to spend a lot of time around the same table, so make sure it is a table you want to sit at.

Glenn: The result is a home that is luxurious but livable, refined but personal, and carefully planned without feeling over-designed. The architecture gives the interior somewhere to belong, while the interior brings the architecture to life.

Looking ahead to Grand Designs Live NEC

Briony: Grand Designs Live represents what this conversation is about. No one person creates a great home. I’m looking forward to hosting the Home & Garden Stage and hearing from architects, garden designers, lighting specialists, product designers and makers. I’m always learning, and conversations with people such as Kevin McCloud are a real highlight.

Glenn: It is also a reminder that successful homes are built through many perspectives coming together: architects, interior designers, builders, craftspeople, specialists, suppliers and, most importantly, the people who will call the home their own.

A shared conclusion

The message from Glenn Cavill Architecture and Briony Ace Interiors is simple: build your team before you build your home. When architecture, interiors and construction are treated as one connected conversation, decisions become clearer and compromises are reduced. The result is a home that feels considered, intuitive and made for real life.

To discuss a project with Glenn Cavill Architecture (at the show stand or via a booked 1-1 consultation at the Architects Hub), visit glenncavill.com. To learn more about Briony Ace Interiors, visit brionyaceinteriors.co.uk, follow @brionyaceinteriors or email info@brionyaceinteriors.co.uk.