The idea of a quiet, dedicated workspace at the bottom of the garden is increasingly appealing to many directors of limited companies, offering a professional work environment without the need to commute to the office, while separating work from family distractions.
However, when your company funds, owns, or uses a garden office structure, it triggers a series of important tax considerations that differ significantly from claiming expenses for a spare room inside your home.
A garden office sits within a unique category for HMRC. It is a business asset built on personal property, which affects how several key taxes apply, including Corporation Tax, Capital Gains Tax (CGT) and Value Added Tax (VAT). Directors and limited companies must navigate these rules to ensure compliance and that the structure is arranged in the most tax-efficient way. At DS Burge & Co, our business tax experts specialise in supporting limited companies to implement a garden office in the most tax-efficient manner.
This article provides a clear, structured overview of the tax implications and compliance requirements for limited companies considering a garden office. We will explore the tax advantages of a garden office and other considerations for limited companies in establishing an office on personal property.
Table of Contents
What is a Garden Office?
A garden office is typically a standalone, insulated structure situated within the grounds of a personal residence. It is designed to function as a fully-equipped workspace, distinct from the main dwelling. These structures can range from pre-fabricated cabins to bespoke, movable office pods.
For tax purposes, HMRC makes a critical distinction between whether the structure is considered a permanent fixture or a movable asset. A building with substantial foundations, connected to utilities, and that has a long lifespan is generally seen as a permanent part of the property. In contrast, a structure that rests on a temporary base (such as soil, concrete blocks, or stilts) and which can theoretically be relocated may be considered plant or machinery. This classification has a direct impact on the availability of certain tax reliefs and allowances.
Garden Office Tax Implications and Running Costs
Corporation Tax & Capital Allowances
When your limited company pays for a garden office, the cost is treated as a capital expenditure and is not eligible for immediate tax relief. The Structures and Buildings Allowance (SBA), which offers relief for commercial buildings, does not apply to structures built on residential property. Therefore, the company cannot claim corporation tax relief on the basic building costs. This is due to the structure not qualifying for plant and machinery as it is seen as setting (even if moveable)
However, tax relief is available on many elements of a garden office construction, including fixtures, fittings and integral features. These costs often qualify through Capital Allowances, such as the Annual Investment Allowance (AIA) scheme, which provides 100% upfront tax relief on the first £1 million of expenditure. Invoices from suppliers must clearly break down costs to transparently demonstrate that purchases are eligible for tax relief claims. A single, lump-sum invoice for a garden office construction is insufficient.
Examples of expenses eligible to AIA relief include:
- Integral Features: Lighting, heating, hot water heating systems, and thermal insulation
- Fixtures: Items fixed to the building, such as kitchen units and fitted desks
- Plant & Machinery: Movable equipment including computers, chairs and freestanding air conditioning.
Claiming tax relief on garden office constructions can be complex, and it is important to ensure that your business is compliant when submitting claims. A detailed breakdown of compliant allowances can be found in the Capital Allowances Act 2001, but it would be prudent to seek professional guidance.
For support with AIA claims and compliance, speak to one of DS Burge & Co’s advisors through our Corporation Tax Return service.
Benefit in Kind
A Benefit-in-Kind (BIK) charge arises when a company-owned asset is made available for the private use of a director or employee. To avoid BIK charges, an individual must prove that the garden office is used exclusively for business purposes.
If a garden office is used for personal purposes, then a benefit-in-kind charge will be triggered. This could be if an individual uses the space as a gym, storage space or as a personal office. Benefit in Kind is calculated as 20% of the market value of the office when first provided, plus any related costs covered by the business.
For an office with an original cost of £50,000 and yearly costs of £500 paid for by the business, tax charges are calculated as follows:
Cost of Office: £50,000
BIK % Charge: 20%
Total BIK Chargeable: £10,000
| Total BIK Chargeable | Directors Marginal Rate | BIK Charge | Cost of Expenses | Total Annual BIK |
|---|---|---|---|---|
| £10,000 | 20% | £2,000 | £500 | £2,500 |
| £10,000 | 40% | £4,000 | £500 | £4,500 |
| £10,000 | 45% | £4,500 | £500 | £5,000 |
When a benefit-in-kind charge is triggered, the company is liable for Class 1A National Insurance (NI). This is charged at 15% on the total BIK chargeable amount, plus any cost of expenses. In the example above, this would be as follows: (£10,000 + £500): £10,500 x 15% = £1,575 NI.
For further information about BIK charges, read our Benefit in Kind guide.
Capital Gains Tax
Capital Gains Tax (CGT) is a tax placed on any profit made from the sale of an eligible asset. The sale of a garden office has tax implications for both the company and the director:
- For the Company: If the company sells a garden office it owns (for instance, a movable office pod sold separately from the house), any gain over its purchase price is subject to Corporation Tax on the chargeable gains.
- For the Director: If a director chooses to sell their main residence, they typically qualify for Private Residence Relief (PRR). However, when a distinct part of the property is used exclusively for business purposes (such as a garden office), the proportion of the gain on the sale of the home may not qualify for full PRR.
For instance, if the garden office represents 5% of the total property’s floor area and is used solely for business use, then up to 5% of the capital gain upon sale could be subject to CGT. This creates a trade-off, whereby it may be beneficial to purchase the home office personally to protect PRR allowances.
Careful financial planning and consideration are required to ensure compliance and minimise any potential future tax liabilities. For guidance, speak to one of DS Burge & Co’s specialist Capital Gains Tax advisors to navigate your garden office construction.
Value Added Tax (VAT)
If your VAT-registered limited company uses the standard VAT scheme, it can typically reclaim the VAT on the cost of purchasing and installing a garden office. This VAT rebate can only be claimed on a garden office used for business purposes. If a garden office is used for personal use, only a proportion of VAT can be claimed. This is based on the distinction between business and personal usage of the garden office. For instance, if a garden office is used 90% for business purposes and 10% for personal purposes, then a VAT rebate can only be claimed on 90% of the cost.
For advice on reclaiming VAT, speak to DS Burge & Co through our VAT Returns Service page.
Running Costs (Utilities and Maintenance)
The ongoing running cost of a garden office used for business purposes is an allowable deduction for Corporation Tax. Typical proportional deductions include:
- Electricity and heating
- Water (if metered separately)
- Internet and phone line costs
- Repairs, maintenance, and cleaning
The proportion of expenses being claimed can be justified using two methods:
Method 1: Proportional expensing
By calculating the office’s floor area as a percentage of your home’s total floor area, a percentage amount can then be directly applied to the total bills of the property. For instance, 10% surface area = 10% of the bill’s cost. Invoices, meter readings and a record of any calculations must be kept.
Method 2: Direct expensing
In some instances, it is possible to provide a direct invoice for an expense to a garden office. For example, repairs and maintenance are directly related to the associated building.
For larger houses, the garden office may only account for a small percentage of the total floor area. As a result, expenses can often be undervalued. Installing meters directly to the garden office to calculate electricity and heating usage can help provide an accurate expense for a rebate.
It is advisable to have a formal reimbursement agreement in place between the business and the individual for compliance. An accurate record of associated business costs must be kept, along with supporting documentation, to ensure that HMRC does not misinterpret business expenses as liable for benefit-in-kind.
Other Garden Office Considerations for your Limited Company
Outside of tax considerations, there are numerous practical and legal factors to consider when building a garden office for your limited company, these include:
- Planning Permission: Most garden offices fall under “permitted development rights”, and assuming they are built within height and boundary restrictions, they do not require planning permission. However, this varies by location, and it is essential to consult with the local authorities before commencing construction.
- Cost of Building: Using company funds to build a garden office could result in cash flow issues. It is important to consider the company’s liquidity position, as construction often requires up-front payment.
- Mortgage Lender: It is important to inform your mortgage lender of the construction, as some lenders have clauses that prevent you from running a business from home.
Garden Office Tax Advantages
With careful planning, a well-structured garden office arrangement can offer several tax efficiencies for limited companies:
- Capital Allowances: Upfront tax relief on a substantial portion of the fit-out costs via schemes such as the AIA.
- Deductible Running Costs: Legitimate ongoing business expenses reduce the company’s taxable profits and thus its corporation tax bill.
- Potential VAT Recovery: For VAT-registered companies, recovering VAT helps to improve initial cash flow.
To secure these advantages and mitigate against HMRC queries, the following steps can be taken:
- Itemised Invoices: Ensure all supplier invoices showcase the separate costs of the structure, from fixtures, fittings, and installation costs.
- Documented Usage Policy: Have a clear company policy that states the office is for exclusive business use.
- Maintain Records: Keep a record of the business use, calculation of running costs and all related receipts. It is wise to maintain a floor plan and photos as evidence for HMRC.
- Formalise Agreements: Consider a formal rental agreement to highlight the commercial relationship between the company and the director.
Conclusion
Investing in a garden office can bring numerous advantages to a director in achieving a better work-life balance. However, purchasing a garden office through a limited company requires balancing notable tax advantages with potential personal tax liabilities. Directors must understand the immediate tax reliefs available to the company as well as the associated costs that can be deducted for business purposes.
To effectively structure and plan for the implementation of a garden office requires careful consideration of the director’s personal tax circumstances, how they plan to use the space, and the consequences if the property is sold. Forward planning can ensure that tax allowances, such as Private Residence Relief (PRR), are maintained, thereby reducing potential tax liabilities for the director.
If you are considering purchasing a garden office for a limited company, speak to DS Burge & Co’s Business Tax advisors for expert guidance.