How Long Does a Project Take?
The timeline for an interior design project depends on scope, property type, and the level of bespoke specification involved. A single-room refresh might take six to eight weeks from brief to completion. A whole-home renovation of a large NW London property can span nine to fifteen months.
Understanding the typical phases and their durations helps you set realistic expectations and plan key decisions at the right time.
Phase 1: Briefing and Designer Selection (2–4 Weeks)
This phase covers writing your project brief, finding and shortlisting designers, holding introductory meetings, receiving and comparing proposals, and appointing your chosen designer.
If you use Interior Design Hampstead's matching service, the briefing and shortlisting process is typically condensed to one to two weeks. We review your brief and introduce two to three designers within a few working days.
Phase 2: Concept Design (3–6 Weeks)
The designer develops initial concepts based on your brief. This phase typically includes a measured survey of the property, space planning and layout options, mood boards and material palettes, initial concept presentations, and revisions based on your feedback.
For period properties in Hampstead, Belsize Park, and Highgate, this phase may be longer if the designer needs to research conservation area requirements or assess which original features to retain.
Phase 3: Detailed Design (4–8 Weeks)
Once the concept is agreed, the designer produces detailed specifications. This includes detailed floor plans and furniture layouts, elevation drawings for key rooms (kitchens, bathrooms, joinery), material and finish specification schedules, lighting layouts and electrical plans, and fixture and fitting selections with costs.
This phase involves the most decision-making from you. Prompt responses to material samples, approval requests, and selection options keep the project on track.
Phase 4: Procurement (4–12 Weeks)
Ordering and lead times vary enormously. Standard items (paint, tiles, basic fittings) may arrive in one to two weeks. Bespoke joinery typically takes six to ten weeks. Imported furniture or specialist lighting can take eight to sixteen weeks. Custom fabrics and upholstery take four to eight weeks.
The designer coordinates procurement schedules to ensure items arrive when needed during the build, not too early (storage issues) and not too late (delays to the programme).
Phase 5: Build and Installation (6–24 Weeks)
The construction phase is managed by your contractor, with the designer conducting regular site visits to check quality and resolve specification queries. Duration depends on scope: a single bathroom or kitchen might take six to eight weeks on site, a full-floor renovation takes twelve to sixteen weeks, and a whole-home renovation can run sixteen to twenty-four weeks or more.
Delays are common — discovery of unforeseen issues behind walls, supply chain delays, or weather-dependent works can all extend timelines. A 10–15% time contingency is prudent for any NW London project.
Phase 6: Styling and Completion (1–2 Weeks)
The final phase covers installation of soft furnishings, artwork, and accessories. The designer dresses the home, makes final adjustments, and conducts a snagging review. For whole-home projects, this can take a full week.
Total Timeline Summary
Single room (bedroom, living room): 3–4 months. Kitchen or bathroom: 4–6 months. Multiple rooms: 6–9 months. Whole-home renovation: 9–15 months. Listed building/major structural: 12–18 months (including consent periods).
What Affects Timelines
**Decision speed.** Slow decision-making on materials and finishes is the single biggest cause of design-phase delays. Respond to designer requests within a few days where possible.
**Bespoke vs off-the-shelf.** Custom items take longer to produce. If your timeline is tight, discuss which elements can use standard products without compromising the design.
**Planning applications.** If your project requires planning permission or Listed Building Consent, add three to six months for the application process before any works begin.
**Contractor availability.** Good NW London contractors are typically booked three to six months ahead. Early procurement of your building team alongside the design process avoids delays at handover.
Planning Ahead
If you have a fixed move-in date or completion deadline, work backwards from that date to determine when each phase needs to start. Share this with your designer and contractor during the briefing phase so everyone is aligned from the outset.