What Jane Duncan Architects + Interiors does

Jane Duncan Architects + Interiors (JDA+I) is a privately held, UK-based architecture and interior design practice founded in 1992 by Jane Duncan OBE in Amersham, Buckinghamshire. The firm operates through two wholly-owned entities, Jane Duncan Architects (JDA, Company No. 4191 587) and Jane Duncan Interiors (JDI, Company No. 5122 900), both VAT-registered and headquartered together at The Old Warehouse in Little Chalfont. JDA delivers bespoke residential architecture alongside selected commercial, leisure, and community projects following the RIBA Plan of Work methodology across Stages 0–7, with particular specialisation in complex planning contexts including Green Belt, Areas of Outstanding Natural Beauty, and Listed/Grade II heritage buildings. JDI provides end-to-end interior design services from concept and space planning through to procurement and project management, offered either independently or integrated with architectural commissions. The practice is led by Jonathan Dale (Owner, JDA, RIBA Chartered Architect since 1999, took ownership from founder in 2020) and Julie Parkinson (Owner, JDI, founder of the interior design arm in 2004), supported by a Finance Director, Associate Directors, Senior Architects, Architectural Technologists, interior designers, and administrative staff. The business makes money through professional fee-based architectural commissions (scope and complexity-driven) and design fees for interior projects, supplemented by a recently introduced tier of fixed-price interior design packages (from £150 to £600+) targeting smaller projects. Customer segments are HNW private residential clients as the primary base, repeat property developer relationships (Belvedere Homes, M-Square, Manorgrove Homes, Thomdell Developments, Stateside Skates), and selective commercial/community clients, with geographic reach across Buckinghamshire, Greater London, Hertfordshire, and the Thames Valley. The firm has no external investment, no disclosed revenue, no proprietary technology platform, and relies on traditional sales-led growth driven by referrals, award recognition, and earned media (Grand Designs, House & Garden, Channel 4's George Clarke's Remarkable Renovations).

Name

Jane Duncan Architects + Interiors

Legal name

Jane Duncan Architects + Interiors

Website

https://janeduncanarchitects.co.uk

Company type

Private

Founded year

1992

Operating status

Operating

Headcount range

11–50 employees

Short description

Jane Duncan Architects + Interiors is a privately held UK architecture and interior design practice, founded 1992 in Buckinghamshire, specialising in bespoke high-end residential projects (including heritage and complex-planning sites) and serving HNW private clients, property developers, and select commercial clients across the South East.

Ownership category

akta.pro rank

Product category

Architectural and Interior Design Services

NAICS

Architectural Services (54131), Interior Design Services (54141)

SIC

Services-To Dwellings & Other Buildings (7340)

akta.pro primary industry

Architectural Design Services (BPAHAKAA)

akta.pro secondary industry

Interior Design Services (BPAHAKAB)

Keywords

• Residential architecture services
• Interior design services
• Heritage conservation architecture
• RIBA plan of work
• Planning consultancy services

Headquarters

HQ city

Amersham

HQ country

United Kingdom

HQ region

Europe

Offices1 record

Markets served

GTM type

B2B and B2C

Offering type

Services

Cost components

Personnel, Operations, Infrastructure, Marketing or Sales, Technology or R&D, Supply Chain

Revenue model

1. Architectural Services: Full architectural services from concept through to construction administration, following RIBA Work Stages 0-7. Services include feasibility studies, design development, planning applications, technical drawings, and contract administration. Revenue generated through professional fees based on project scope and complexity.
2. Interior Design Services: End-to-end interior design services from concept through to procurement of fixtures and fittings. Services offered independently or in conjunction with architectural services. Revenue generated through design fees and procurement/discount pass-throughs on furniture and fittings.
3. Interior Design Packages: Fixed-price interior design packages for smaller projects including mood boards, layout options, 2D visuals, and shopping lists. Packages range from £150 to £600+ depending on scope. Additional purchasing services available through trade supplier discounts.

Pricing tiers

Go-to-market motion1 record

Distribution channels1 record

Marketing channels5 records

Core offering

Jane Duncan Architects + Interiors provides bespoke architecture and interior design services through two integrated practices: Jane Duncan Architects (JDA) follows the RIBA Plan of Work across Stages 0–7 for residential, commercial, leisure, community and education projects, and Jane Duncan Interiors (JDI) delivers end-to-end interior design from concept through procurement of fixtures and fittings. The practice also offers fixed-price interior design packages for smaller domestic projects such as single rooms, kitchens, lighting plans, and joinery design.

Product overview

Jane Duncan Architects + Interiors operates two distinct but integrated service lines: Architecture Services (JDA) and Interior Design Services (JDI). JDA provides bespoke residential architecture and interior design with expertise in commercial, leisure, and community sectors, following the RIBA Plan of Work methodology through five steps: Getting Started, Design, Planning, Technical Design, and Procurement/Construction. JDI offers complete end-to-end interior design services from concept through to project completion, including flexible service packages ranging from single-room refresh packages (Package A from £450, Package B from £600, Mini Package from £225) to bespoke consultancy services. Both services can be engaged independently or in collaboration. The practice was established in 1992 and is based in Little Chalfont, Buckinghamshire.

Differentiator

Problem solved

Functional benefit

Products and services

• Architecture Services (JDA) Bespoke architectural services for residential, commercial, leisure, community, and education projects, following the RIBA Plan of Work methodology across five stages: Getting Started (Stages 0-1), Design (Stages 1-3), Planning (Stages 2-3), Technical Design (Stage 4), and Procurement and Construction (Stages 5-7). Includes feasibility studies, design development, planning applications, technical drawings, and contract administration. Services can be tailored to specific stages or full project management.
• Interior Design Services (JDI) End-to-end interior design services delivered through Jane Duncan Interiors covering concept and design development, finding contractors, project management, and sourcing of fixtures, fittings, and furniture. Services can be commissioned independently or in collaboration with the architecture studio, with trade supplier discounts on furniture, fittings, and equipment passed through to clients.
• Interior Design Packages Fixed-price interior design packages including: Package A (from £450) for single rooms with 30-minute video consultation, multiple layout options, final floor plan, 2D elevation visuals, mood board, and curated shopping list (2+ week lead time); Package B (from £600) for open plan spaces, bathrooms, and kitchens with 50-minute video consultation, multiple layout options, and furniture suggestions (4+ week lead time); Mini Design Package (from £225) with 30-minute video call, mood board, and purchasing list (1 week lead time). Purchasing services for FF&E through trusted suppliers available with exclusive trade discounts.
• Lighting and Small Power Plans Lighting and small power plans with fitting suggestions, available as a standalone service to purchase through JDA+I for client implementation, or as a design concept for clients to use with their own contractors. Priced from £150.
• Fitted Joinery Design Detailed fitted joinery design service producing drawings that can be used by the client, their builder, or JDA+I's recommended joiners to manufacture and install the joinery. Priced from £75 per room.
• Additional Consultation Standalone one-hour face-to-face consultation provided at the client's home or at the JDA+I studio. Priced from £150.

Named customers5 records

Segments3 records

Ideal customer profiles3 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Partnerships

30 partnerships are on record, tiered core and minor.

• Belvedere HomescoreStrategic or Co-development PartnerOngoing working relationship with local developer Belvedere Homes for residential development projects including award-winning 10,000 sq ft house in Gerrards Cross.
• McWilliam StudiocoreStrategic or Co-development PartnerRegular collaboration with landscape architects McWilliam Studio on residential projects. Worked together on Chorleywood project (shortlisted for Chiltern Design Award 2012 and won Society of Garden Designers Awards 2013) and other projects.
• Coleman MyerscoreImplementation/ SI/ Consulting PartnerRegular contractor partner for residential projects including award-winning interior design project in St Leonards and pool/spa facilities in Chorleywood.
• K D ConstructioncoreImplementation/ SI/ Consulting PartnerContractor for modern pavilion project with spa pool in Latimer.
• Pearson BuildingcoreImplementation/ SI/ Consulting PartnerContractor for phased extension and alterations project with basement leisure suite and outdoor swimming pool in Chorleywood.
• DBC Contracting LtdcoreImplementation/ SI/ Consulting PartnerContractor for bespoke indoor pool project in Chesham Bois featuring charred timber cladding and contemporary design.
• Urban Front LtdminorImplementation/ SI/ Consulting PartnerLocal supplier of contemporary hardwood doors used on multiple residential projects. Client of 1970s bungalow renovation featured in Grand Designs.
• Top Notch DesignscoreImplementation/ SI/ Consulting PartnerKitchen manufacturer partner for multiple projects including Latimer pavilion and Chorleywood family home.
• Luke Jones FurnitureminorImplementation/ SI/ Consulting PartnerJoinery manufacturer for modern new build interior design project in Berkhamsted.
• CGLAminorStrategic or Co-development PartnerLandscape design partner for extension and whole house refurbishment project in Beaconsfield.
• Ryan's CDMminorImplementation/ SI/ Consulting PartnerContractor for extension and whole house refurbishment project in Beaconsfield.
• Derek Lofty and AssociatesminorStrategic or Co-development PartnerStructural engineer for extension and whole house refurbishment project in Beaconsfield.
• JNP GroupminorStrategic or Co-development PartnerHighways/Transport consultant for Old Amersham residential development (38 dwellings from Grade II listed brewery).
• Crossman AssociatesminorStrategic or Co-development PartnerEcology consultant for Old Amersham residential development project.
• SLR ConsultingminorStrategic or Co-development PartnerFlood Risk Consultant for Old Amersham residential development project.
• SJA TreesminorStrategic or Co-development PartnerArboricultural Consultant for Old Amersham residential development project.
• ACD EnvironmentalcoreStrategic or Co-development PartnerLandscape design partner for Old Amersham residential development of Grade II listed former maltings site.
• The Built Heritage Consultancy LtdcoreStrategic or Co-development PartnerHistoric buildings consultant for Old Amersham residential development (38 dwellings from Grade II listed brewery).
• DLBP LtdcoreStrategic or Co-development PartnerPlanning consultant for Old Amersham residential development project.
• Thomdell Developments LtdcoreChannel Partner/ Reseller/ DistributorDeveloper client for Old Amersham residential development - prestige historically significant Grade II listed former maltings site to create 38 new dwellings.
• Taylor TrippminorStrategic or Co-development PartnerLandscape design partner for indoor pool and gym project in Buckinghamshire.
• Barr BuildcoreImplementation/ SI/ Consulting PartnerContractor for new indoor pool and gym project in Buckinghamshire.
• RWAminorStrategic or Co-development PartnerStructural engineer for indoor pool and gym project in Buckinghamshire.
• Bespoke Pool CompanyminorImplementation/ SI/ Consulting PartnerPool designer for new indoor pool and gym project in Buckinghamshire.
• PBI Audio VisualminorImplementation/ SI/ Consulting PartnerAV contractor for new indoor pool and gym project in Buckinghamshire.
• Fortis ConstructioncoreImplementation/ SI/ Consulting PartnerContractor for refurbishment and alterations of Grade II listed building in Amersham, featured on Channel 4's George Clarke's Remarkable Renovations.
• RWAminorStrategic or Co-development PartnerStructural engineer for refurbishment and alterations project in Amersham.
• Ben Penreath LtdminorStrategic or Co-development PartnerCollaboration on traditional country home in Georgian style project in Buckinghamshire.
• Stateside SkatesminorChannel Partner/ Reseller/ DistributorClient for bespoke offices within large warehouse space on industrial estate in Amersham. Award-winning worldwide distributor of extreme sports products.
• M-SquareminorChannel Partner/ Reseller/ DistributorDeveloper client for conversion of detached dwelling into pair of semi-detached homes in Iver, Buckinghamshire.

Scale indicators3 records

Recent moves8 records

Expansion highlights5 records

Direct peers

• Katharine Pooley: International luxury interior design firm serving ultra-HNW private clients on residential projects; comparable on luxury residential positioning, trade sourcing and procurement pass-throughs.
• Sims Hilditch: UK-based interior design studio specialising in country-house and high-end residential projects, with comparable HNW client base, magazines-led marketing and package-driven service model.
• Bidgood & Co: Independent architecture and interior design practice active in the London/South-East prime residential market; directly comparable boutique peer working on bespoke residential commissions.
• Rose Uniacke: London-based luxury interior designer known for high-end residential commissions; directly comparable on HNW clientele, design-led brand positioning and fee-based service delivery.
• Studio Indigo: London architecture and interior design practice focused on prime residential and heritage projects; comparable on dual architecture + interiors model and listed-building expertise in the UK South-East.
• Veere Grenney: Established London-based luxury interior designer for private clients; directly comparable on high-end residential interiors, premium brand positioning and repeat HNW client relationships.
• Knight Harwood: Boutique London architecture practice focused on high-end residential and heritage projects; closely comparable peer operating in the same UK prime-residential, RIBA-plan-of-work niche.

Broad incumbents

• Foster + Partners: Global architecture firm offering high-end residential, commercial and mixed-use design; broader incumbent peer with overlapping RIBA-affiliated, RIBA Plan of Work-aligned practice and prestige-brand positioning.
• Scott Brownrigg: UK-based architecture and interior design practice with residential, commercial and community sector expertise; broad-incumbent peer operating on a similar RIBA-aligned methodology and award-driven positioning.
• Benoy: International architecture, interior and brand design practice with UK roots; broad-incumbent peer that also pursues mixed-use, commercial and high-end residential commissions through an integrated studio model.

Market position

Strengths5 records

Weaknesses4 records

Competitive moat3 records

Key risks6 records

Key highlights6 records

Customer concentration

• LinkedInlinkedin.com/company/jane-duncan-interiors-limited

Compliance3 records

Revenue estimate

Valuation estimate

Number of profiles

Profiles4 records

Subsidiaries2 records

Funding overview

Funding rounds

Investors

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A

Investments

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about Jane Duncan Architects + Interiors