Interior Architecture in London

Interior architecture sits between spatial planning and interior design. It is concerned with how rooms relate, how circulation and daylight work, where storage lives, and how junctions, joinery, stairs and thresholds are resolved. Done well, it is what makes a refurbished home feel calm and intentional rather than simply redecorated. Space planning is part of this service: we are happy to test and improve a layout as a focused, standalone piece of work — reworking how rooms, circulation and light fit an awkward footprint before you commit to planning or construction — as well as carrying that plan through to full interior detailing.

We coordinate interior detail with the structural and building regulations information — and with kitchen designers, lighting designers and specialist makers where involved — so the interior intent survives construction rather than being value-engineered away on site.

It helps to be clear about what this is. Interior architecture is the permanent, spatial layer of a home — walls and openings, levels and circulation, joinery, stairs, the way light is brought in and how one material meets another. Interior decoration — soft furnishings, loose furniture, styling and colour schemes — sits on top of it. The two work best together, and we are happy to work alongside an interior designer, but our role is the architecture of the interior: the decisions that are built in and expensive to change, rather than the ones that can be restyled later.

Much of what makes a home feel resolved is bespoke joinery and considered storage: wardrobes, bookcases, window seats, utility and boot rooms, and the concealed cupboards that keep daily life out of sight. Designed as part of the architecture, joinery can square off an awkward room, hide structure and services, and give a period house the storage it was never built with. We design and detail this cabinetry properly and coordinate it with the makers, so it fits the room as drawn and reads as part of the building rather than furniture pushed against a wall.

The difference between an ordinary interior and a memorable one is usually in the detail you do not consciously notice: layered lighting that suits both cooking and a quiet evening, a restrained material palette carried consistently through the home, and the careful resolution of junctions — reveals, shadow gaps, flush thresholds and the meeting of floor, wall and joinery. We design these deliberately and draw them so they are built as intended, because it is precisely this quiet, consistent detailing that makes a refurbished home feel calm and intentional.

Interior architecture starts with how rooms connect, where light lands, and how people move. We resolve openings, levels, stairs and built-in storage as architecture — decisions that must sit in structural and building regulations information — before soft finishes are chosen. That order prevents expensive rework when a sofa layout arrives after the walls are fixed in the wrong place.

In period houses and mansion flats, working with existing grain usually beats forcing an open-plan template that fights the structure.

Bespoke joinery, stair design, doorsets, thresholds and integrated lighting are where interior architecture becomes daily life. These elements need coordinated drawings, not mood-board aspiration alone. We detail them with the same discipline as the rest of the technical package so makers and contractors build what was designed.

Services integration — heating, extract, power, data — is part of the same conversation. Pretty joinery that blocks a riser is not resolved design.

Interior architecture bridges residential architecture and decorative interior design. When we lead both permanent and decorative layers, one team owns the whole story. When clients already have an interior decorator, we still need a clear interface so fabric changes and finishes do not collide.

Consents follow the works: planning or freeholder approval where fabric changes; building regulations for structure, fire and wet rooms. We keep those tracks visible from the first briefing.

Internal alterations to an unlisted house usually fall outside planning control, but that does not mean nothing needs approval. Building regulations apply the moment the work touches structure, fire safety, ventilation or a stair: a removed wall needs justified structural information, a relocated bathroom brings Approved Document F ventilation and drainage into play, and a new or altered staircase must satisfy Approved Document K on pitch, headroom and guarding, which is often the tightest constraint on an elegant stair in a period house. Electrical work in kitchens and bathrooms falls under Approved Document P.

In flats the lease adds a second track. Leases commonly require the freeholder's consent for alterations, evidenced through a licence to alter, and floor finishes can be restricted for acoustic reasons even where nothing structural moves. Listed buildings are the strictest case, because listed building consent covers internal fabric, including partitions, cornices, joinery and sometimes finishes, and applies whether or not a change is visible from the street. We establish which of these tracks apply before detailed design begins, so the interior we draw is one that can actually be built and signed off.

An interior package earns its keep when the work is priced and built. Joinery, stairs and bespoke detail that exist only as reference images tend to be priced as provisional sums, and provisional sums are where budgets unravel: a contractor either guards against the unknown or under-allows and recovers the difference through variations once the job is under way. Detail that is properly drawn, with setting out, sections through the junctions, and materials and ironmongery specified, lets specialist makers and the main contractor price the same thing, whether inside a wider tender package or as separate packages placed directly with makers.

Sequencing matters as much as price. First-fix services have to anticipate the joinery that will conceal them, floor build-ups need agreeing before flush thresholds can be set out, and a bespoke stair is usually surveyed, fabricated and fitted to a programme of its own. During construction we review shop drawings and samples against the design intent and pick up the small site decisions, a shifted socket or a revised reveal, before they are built wrong. Where we are appointed for contract administration that oversight is formalised; either way, the aim is that what is installed is what was drawn.