Interior design London homeowners can build from, not just look at. Signature Build Properties is a design and build company in London: we draw the scheme and we do the construction under one roof, so nothing is lost between designer and builder. From a single room or a London flat interior design to a full home transformation, every project is managed end to end with a free consultation and a written fixed price.
From a single room consultation to a complete design and build project, our interior design services in London cover the full range under one roof. We design, we source, and our own trades carry out the work, whether that is a kitchen renovation, a bathroom renovation in London or a whole home renovation.
Concept, mood boards, space planning, material selection and full project management, with every room designed to work beautifully together.
Interior design combined with full construction management. One team takes it from drawings through to the final finish.
We turn tired, dated interiors into modern, beautifully finished homes, giving you a completely new look without moving house.
Individual rooms, a single floor or a whole property, in any style from contemporary to classic period restoration.
Typical interior design London costs are below, as a guide. Most London design studios charge by the hour or take a percentage of build cost, so the design fee sits on top of the build. As a design and build company we quote one fixed price that covers both, which is usually where homeowners save. We always give a detailed written quote after a free consultation, so you know exactly what is included before committing.
Cost depends on the scope of work, the size of the space and the level of finish. Design only work, where we produce the drawings and specification for your own builder, starts at £1,500 for a single room. Full design and build is priced at roughly £1,200 to £1,800 per square metre for a mid specification London finish, so a 3-bed house of around 110m² typically runs £130,000 to £200,000 all in, and a single room strip out and rebuild £22,000 to £38,000. Unlike most London studios we do not charge a design fee on top of the build, so the number you are quoted is the number you pay.
| Service | Typical Cost | Duration | Best For |
|---|---|---|---|
| Interior Design Consultation | Free | 1 to 2 hours | Every project starts here |
| Extended Design Consultation, on site | £250 to £500 | Half day | Second opinion before you commit |
| Design Only, single room (drawings and spec) | £1,500 to £4,000 | 3 to 6 weeks | You already have a builder |
| Design Only, whole home (drawings and spec) | £6,000 to £18,000 | 6 to 12 weeks | You already have a builder |
| 3D Visuals and Room Renders | £300 to £900 per room | 1 to 2 weeks | Seeing the scheme before work starts |
| Interior Refresh, no structural work | £3,000 to £10,000 per room | 2 to 4 weeks | Decoration, flooring and lighting |
| Single Room Design and Build (18 to 22m²) | £22,000 to £38,000 | 4 to 8 weeks | Full strip out and rebuild |
| Full Ground Floor Design and Build (50 to 60m²) | £60,000 to £105,000 | 10 to 16 weeks | Open plan reconfiguration |
| London Flat, full design and build (65 to 80m²) | £80,000 to £140,000 | 3 to 4 months | Leasehold flats and apartments |
| Three Bed House, full design and build (about 110m²) | £130,000 to £200,000 | 4 to 6 months | Whole house transformation |
| Period Property Interior Restoration | £150,000 to £250,000 | 5 to 8 months | Victorian and Edwardian terraces |
| Kitchen Design and Fit | £18,000 to £35,000 | 4 to 8 weeks | Full kitchen transformation |
| Bathroom Design and Fit | £12,000 to £20,000 | 2 to 4 weeks | Mid spec bathroom redesign |
| En Suite Design and Fit | £8,000 to £15,000 | 2 to 4 weeks | New en suites from bedrooms |
| Loft Interior Design and Fit Out | £16,000 to £30,000 | 4 to 8 weeks | New loft rooms and en suites |
| Extension Interior Fit Out | £25,000 to £55,000 | 6 to 12 weeks | New rear and side extensions |
| Bespoke Joinery and Fitted Furniture | £2,000 to £9,000 | 4 to 8 weeks | Media walls, alcoves, wardrobes |
| Lighting Design and Rewire | £1,800 to £6,500 | 1 to 3 weeks | Layered lighting schemes |
All figures are indicative for London and, apart from the design only rows, they cover the design and the construction together. Full renovation work is priced at roughly £1,200 to £1,800 per square metre for a mid specification finish, which is the London market rate and how most renovation budgets are benchmarked. Lighter refurbishment sits below that band and high end or listed work sits above it. Most London interior designers charge separately, either an hourly rate or a percentage of the build cost, and the British Institute of Interior Design explains how those fee structures vary from studio to studio. We do not add a design percentage on top of your build. You get one written fixed price covering both, agreed after a free consultation, with no hidden costs. You can also try our construction cost calculators for a first estimate.
From your first call to the finished home, here is how our interior design service in London runs, concept to completion, with one team and one point of contact. The same process runs whether we are redesigning one room or delivering interior design alongside a house extension or loft conversion.
We visit your property, listen to your ideas, assess the space and discuss your style, budget and timescale. No obligation.
We create detailed mood boards, material palettes and space plans so you can picture the finished result before any work starts.
Once the design is agreed, you get a detailed written fixed-price quote, itemised across design, materials, labour and project management.
We source materials, furniture and fittings at trade prices, manage the schedule, and handle any planning and building-regulation requirements.
Our own team carries out the work, plastering, flooring, joinery, electrics, plumbing and decorating, with no subcontractor gaps.
We walk through the finished project with you room by room, resolve any snags, and issue your written workmanship guarantee.
As interior designers in West London we design and renovate every room in the house, from the hallway to the loft, as a single managed project. Period terraces, Victorian conversions and new build flats are all everyday work for us across West and South West London.
We are a fully insured design and build company with public liability cover in place. Every project is delivered on a written fixed price contract and backed by our workmanship guarantee. Read our verified Google reviews below, and once your project is complete we would be glad to add yours.
Design and construction handled together, so there is no gap between the vision and the build, and one point of contact throughout.
Fully insured, with a written fixed-price quote up front and a workmanship guarantee issued on completion.
Our completed projects are reviewed independently by the homeowners we built them for. Read them on Google below, and leave your own once we finish yours.
We will visit your property, talk through your vision and give you a clear, honest, fixed-price quote. No pressure, just straight advice and beautiful results.
Contact us today to discuss your project and receive a no-obligation quote.
