Interior design for London and the Home Counties

Beautiful homes, considered spaces, proportioned to you.

A living room with a leather sofa, abstract painting on the wall, two shelving units with decorative items, lamps, and a round marble coffee table with a potted plant.

What my clients say

“Living in the finished product, our home is now at such a high standard that staying at luxury hotels often feels like a downgrade.”

—Marianne & Alessandro, London, UK

Peter Lewin is the designer and founder of In Good Proportion.

“When I design, I focus on both style and proportion. To create a style that is uniquely yours, before any concept work begins, I spend time understanding not just what you like, but why — what draws you to a particular look or design — so I can design a space through your eyes.”

  • “Next, I focus on proportion, the features, colour, light, and texture calibrated to the building and how you live in it. It's how a room goes from awkward to beautiful and useful. It’s a function of maths as well as taste, and it permeates the entire design process.

    “Designing a home can be genuinely joyful — and it can also be stressful, with a lot of decisions and moving parts. My aim is to hold the vision, structure and detail so you don't have to. The process stays collaborative and creative, and the result feels unmistakably yours.”

A man with short brown hair wearing a navy blue button-up shirt, seated at a table with hands clasped, in front of a colorful abstract painting of a vintage-style living room with chairs, a sofa, and a table.
A man with short brown hair wearing a navy blue button-up shirt, seated at a table with hands clasped, in front of a colorful abstract painting of a vintage-style living room with chairs, a sofa, and a table.
Learn more about Peter
Bright living room filled with natural light from large windows. Contains gray armchair with patterned pillow, tan leather sofa, round coffee table with magazines, and various plants. Decor includes paintings, a lamp, and vases. A contemporary wooden
A dining room featuring a round marble table surrounded by black modern chairs with curved backs. The room has cream-colored curtains on two windows, a framed abstract line drawing on the wall, white curtains hanging from the ceiling, and light woode
Empty hallway with wooden flooring, white walls, modern wall-mounted lights, and a door at the end with glass panels.
Modern bathroom with a large mirror, white sink, wall-mounted faucet, and walk-in shower with glass partition. The shower area has built-in shelves, a rainfall showerhead, and a textured tiled wall in a chevron pattern.
Kitchen with white cabinets, gold handles, a white countertop, and an open window overlooking houses and trees outside.
Interior scene with a large green plant on the left, a framed abstract line art picture on the wall, and sunlight casting shadows in the room.
A bedroom with two beds, a nightstand with a lamp, a large painting of a garden scene on the wall, a window with sheer blinds, and beige curtains.
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A hallway in a house with white walls, large windows, and wooden floors, illuminated by natural light from outside, with a view towards a room at the end of the corridor.

A structured, transparent approach built around your needs.

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