What Carpenter Box does

Carpenter Box is a UK chartered accountancy and business advisory firm founded in 1924 and headquartered in Worthing, West Sussex. The firm operates eight physical offices across South East England (Worthing, Brighton, Chichester, Crawley, Lewes, London, Portsmouth, Southampton) and employs approximately 280 people (nearly 300 partners and colleagues according to the firm). It is a trading name of Carpenter Box Limited and a subsidiary of Sumer Group Holdings Limited, with international reach extended via membership in Geneva Group International (GGI).

The firm's core products span the full accounting and advisory value chain: Accounts and Business Services, Audit and Assurance, Business Tax, Digital and Cloud Solutions (Xero, FreeAgent), Corporate Finance, Estate Planning, Financial Planning, International Services, Outsourced Finance Services, Payroll, Private Client services, and a Tax Enquiry Protection Service providing insurance-backed fee coverage up to £100,000 per claim. Its specialised sub-brand StarBox serves the creative and digital media sector (online creators, influencers, video game developers), scaled to 28 team members. The firm is structured by sector vertical across 12+ industries including Academies, Construction, Charity, Healthcare, Hospitality, Manufacturing, Motor Retail, Solicitors, and Agriculture, combining generalist capability with deep specialist teams.

Carpenter Box generates revenue through professional services fees billed per engagement or retainer, with no public pricing disclosed. Its go-to-market is sales-led and relationship-driven via direct engagement at its eight offices, supported by content marketing (blog, Budget Hub, tax rate guides), email newsletters, events, and community/CSR programmes. The primary customer segments are SMEs and owner-managers plus private individuals/HNW families, with secondary vertical specialisations in charities, academies, construction, agriculture, and creative industries. Distribution is exclusively direct through physical offices and professional referral networks.

Name

Carpenter Box

Legal name

Carpenter Box Limited

Website

https://carpenterbox.com

Company type

Private

Founded year

1924

Operating status

Operating

Headcount range

251–500 employees

Short description

Carpenter Box is a UK chartered accountancy and business advisory firm with ~280 employees across eight South East England offices. It serves SMEs, owner-managers, and high-net-worth individuals with tax, audit, advisory, payroll, and financial planning services, and operates as a subsidiary of Sumer Group.

Ownership category

akta.pro rank

Headquarters

HQ city

Worthing

HQ country

United Kingdom

HQ region

Europe

Offices8 records

Markets served

GTM type

B2B

Offering type

Services

Cost components

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

Revenue model

1. Professional Services (Accounting, Tax, Audit, Advisory): Fees earned for chartered accountancy, tax advisory (business tax, private client, international), audit and assurance, corporate finance, estate planning, financial planning, and outsourced finance function services. Revenue is primarily recurring through long-term client relationships and ongoing compliance engagements.

Go-to-market motion1 record

Distribution channels2 records

Marketing channels7 records

Core offering

Carpenter Box is a chartered accountancy firm providing accounting, audit, tax (business and private client), corporate finance, estate planning, financial planning, payroll, and outsourced finance function services to SMEs, owner-managers, private clients, and sector-specific organisations across South East England. The firm also offers cloud-accounting implementation through its Digital and Cloud Solutions team and operates StarBox as a specialist sub-brand serving online creators, influencers, and digital entrepreneurs.

Product overview

Carpenter Box is an award-winning firm of Chartered Accountants, Tax and Business Advisers offering a comprehensive suite of professional services. The firm operates as a single unified advisory practice organized into specialist business groups rather than a platform-plus-modules architecture. Core services include Accounts & Business Services, Audit and Assurance, Business Tax, Digital and Cloud Solutions, Corporate Finance, Estate Planning, Financial Planning, International Services, Outsourced Finance Services, Payroll, Private Client, and Tax Enquiry Protection Service. The firm also operates StarBox as a specialized sub-brand serving the creative and digital media sector (online creators, social influencers, video game developers). Services are delivered across multiple industry sectors including Academies, Agriculture, Charity & Not for Profit, Construction & Real Estate, Creative & Media, Healthcare, Hospitality & Leisure, Manufacturing & Engineering, Motor Retail, Solicitors, Transport & Logistics, and Vineyards.

Differentiator

Problem solved

Functional benefit

Brands

• StarBox: Specialist accountancy service for online creators, social influencers, and entrepreneurs. A market-leading service in the new media sector that has grown from 4 to 28 team members.

Products and services

• Accounts & Business Services Comprehensive accounting and business support services including bookkeeping, financial statements, and business advisory for SMEs and owner-managed businesses.
• Audit and Assurance Independent audit and assurance services to verify financial statements and provide credibility for businesses, charities, and academies.
• Business Tax Corporate and business tax planning, compliance, and advisory services including VAT expertise for UK businesses.
• Digital and Cloud Solutions Cloud accounting technology services including implementation and support for Xero, FreeAgent, and other digital accounting platforms, delivered as a dedicated service line.
• Corporate Finance Advisory services for mergers, acquisitions, disposals, and business valuations for SMEs and mid-market companies.
• Estate Planning Inheritance tax planning, wills, trusts, and estate administration services for individuals and families.
• Financial Planning Independent financial advice including investment planning, pensions, and wealth management for individuals and business owners.
• International Services Cross-border tax planning and advisory for businesses setting up in the UK and those operating internationally, leveraging the GGI international adviser network.
• Outsourced Finance Services End-to-end accounting and finance solutions outsourced to Carpenter Box, including bookkeeping, management accounts, payroll, payment runs, budgeting, and forecasting.
• Payroll Payroll processing services including auto-enrolment, RTI submissions, and payroll administration for UK employers.
• Private Client Personal tax planning and financial advisory services for high-net-worth individuals and families.
• Tax Enquiry Protection Service Insurance-backed protection covering professional fees up to £100,000 for clients subject to HMRC investigations, enquiries, business inspections, VAT/PAYE disputes, employment status disputes, IR35 checks, and Gift Aid inspections.
• StarBox Specialist accountancy and financial advice service for online creators, social influencers, video game creators, and digital entrepreneurs. Provides 360-degree service including compliance, tax advice, corporate reorganisations, and Video Games Expenditure Credit claims. The team has grown from 4 to 28 members.

Quantifiable outcome

• Tax Team of the Year — Accounting Excellence Awards 2024
• +2 more outcomes

Named customers7 records

Segments13 records

Ideal customer profiles6 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature1 record

Partnerships

Three partnerships are on record, tiered core.

• Hartley FowlercoreStrategic or Co-development Partner · 9 February 2026Carpenter Box merged with Hartley Fowler's Brighton office in February 2026. This merger expanded Carpenter Box's presence in Brighton, adding Hartley Fowler's client base and team to its Brighton office operations. The merger strengthens Carpenter Box's regional footprint in the South East.
• Sumer GroupcoreOthersCarpenter Box is part of Sumer Group Holdings Limited, a group of accounting and advisory firms. The firm operates as a trading name of Carpenter Box Limited and benefits from group-level resources, shared technology platforms, and cross-firm collaboration. The Sumer Group includes multiple member firms including Monahans Limited and EQ Accountants Limited.
• GGI (Geneva Group International)coreStrategic or Co-development PartnerCarpenter Box is a member of GGI, an international association of independent accountants and advisers sharing a similar service-led ethos. GGI membership provides Carpenter Box with a global network of trusted advisers, enabling the firm to offer clients access to reliable professional advice anywhere in the world through a network of member firms.

Scale indicators5 records

Recent moves7 records

Expansion highlights5 records

Broad incumbents

• Crowe UK: UK member of the Crowe Global network offering audit, tax, advisory, and risk services to mid-market and SME clients. Competes for similar sector mandates but with a much wider geographic and capability footprint.
• RSM UK: Large UK mid-tier network with a much broader national footprint and deeper international reach, competing for the same mid-market and owner-managed clients as Carpenter Box but at a significantly larger scale.
• BDO UK: Major UK mid-tier accounting and advisory network with extensive sector specialisations and national coverage. Overlaps with Carpenter Box's mid-market audit, tax, and advisory work but operates at substantially greater scale.

Direct peers

• Monahans: Sister firm within Sumer Group alongside Carpenter Box, offering chartered accountancy, tax, and advisory services to SMEs and private clients across the South West and Thames Valley. Direct structural peer under common ownership.
• Azets: UK mid-tier accountancy group (PE-backed by TPG) providing chartered accountancy, tax, audit, and advisory services to SMEs and owner-managers with sector specialisations. Comparable mid-tier peer with roll-up DNA similar to Sumer.
• Kreston Reeves: UK chartered accountancy and advisory firm with a comparable multi-office regional footprint in the South East (Kent, Sussex, Surrey) and a similar mix of SME, owner-manager, and private-client services. Directly comparable in headcount band and service breadth.
• Moore Kingston Smith: London-based chartered accountancy firm serving owner-managed businesses, SMEs, and private clients with a comparable mix of compliance, tax, advisory, and outsourced finance services. Direct mid-tier competitor.
• EQ Accountants: Another Sumer Group member firm providing chartered accountancy and business advisory services to SMEs and private clients in Scotland. Closely comparable in service mix, target market, and group-level structure.
• MHA MacIntyre Hudson: UK mid-tier chartered accountancy network with comparable SME and owner-manager focus, sector specialisations, and breadth of tax and advisory services. A direct mid-tier peer operating in the same competitive set.
• HW Fisher: London-based chartered accountancy firm of broadly similar size and owner-managed business focus, offering audit, tax, advisory, and corporate finance services to UK SMEs. Closely matched in scale and client profile.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat5 records

Key risks5 records

Key highlights7 records

Customer concentration

• Instagraminstagram.com/carpenter_box
• Xx.com/carpenterbox
• Facebookfacebook.com/carpenterbox
• LinkedInlinkedin.com/company/carpenter-box

Revenue estimate

Valuation estimate

Number of profiles

Profiles12 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 Carpenter Box