Separate non-depreciable land value from building, structure and fixture costs. Use the calculator to estimate a fair land/building split, model UK Structures and Buildings Allowance at 3%, and create a simple property depreciation schedule for planning.
The purchase price of a property is one figure, but the tax and accounting treatment is usually split into several parts.
A UK property purchase normally includes land, buildings, fixtures, legal fees, taxes and sometimes plant and machinery. The problem is that those components do not all behave the same way. Land is usually treated as having an indefinite life, so it is not depreciated in the accounts and it does not qualify for plant and machinery capital allowances. Buildings may be depreciated for accounting purposes, while qualifying non-residential structures may receive Structures and Buildings Allowance, often shortened to SBA.
This Land Depreciation Calculator UK is designed to stop one of the most common property mistakes: applying a depreciation rate to the full purchase price. If a commercial building is bought for £800,000 and £240,000 of that value relates to land, the depreciable building base is not £800,000. A cleaner starting point is £560,000 before you consider fixtures, integral features, renovation costs and any separate plant and machinery claims.
The calculator gives a planning estimate, not a formal valuation. For a final HMRC position, a significant commercial acquisition, or a property with unusual development potential, you should support the split with professional evidence. A RICS valuation, surveyor apportionment, construction invoices, comparable land sales or a completion statement with clear allocation are stronger than a generic percentage.
Use the quick split, detailed SBA schedule or comparison tab depending on how much information you already have.
Use this tab when you know the purchase price but do not yet have a professional valuation. The location percentage is only a planning assumption and can be overridden with your own land percentage.
Planning estimate only. Actual SBA depends on qualifying expenditure, use, dates, allowance statement and supporting evidence.
Use this tab when you already have a land valuation or a reliable apportionment. It produces a year-by-year SBA-style schedule at 3% of the qualifying structure cost.
Compare two possible purchases. A cheaper property with a low land percentage can sometimes create more annual building relief than a more expensive land-heavy property.
These headline points help you understand what the calculator is doing before you use the results in accounts or tax planning.
Land is normally held at cost or revalued, but not depreciated. It is also excluded from plant and machinery allowances.
SBA gives tax relief on qualifying non-residential construction or renovation costs, usually over 33⅓ years.
Fixtures, integral features and equipment may sit outside the land/building split and need capital allowance review.
For serious claims, generic percentages are weak. Keep professional valuation support and an allowance statement where required.
Land usually means the site itself: the ground, plot, development rights and location value. It may include garden space, yard areas, parking areas or surplus land, depending on the property. Land value is often driven by scarcity, planning potential, access, transport links and alternative use. Because land does not wear out in the same way as a roof, heating system or building frame, it is normally treated as non-depreciable.
Buildings and structures include walls, floors, roofs, foundations, basic shell construction, car parks, roads, bridges, tunnels and similar structural works. For accounting purposes, a business might depreciate a building over a long useful life if its policy allows. For tax, the SBA rules are more specific: the relief is only for qualifying construction expenditure on structures and buildings used for qualifying activities, with the correct dates and evidence.
Fixtures and integral features need careful treatment because they are not always part of the same building base. Electrical systems, cold water systems, lifts, escalators, heating, ventilation and air-conditioning may fall into special rate plant and machinery pools. Loose assets such as desks, racking, kitchen equipment, security equipment and IT hardware are normally separate plant and machinery. Splitting these items properly can materially change the timing of tax relief.
| Component | Typical treatment | Common evidence | Calculator handling |
|---|---|---|---|
| Land | Normally not depreciated; no plant and machinery allowance | RICS valuation, comparable land sales, purchase apportionment | Excluded from depreciation and SBA base |
| Building shell | May be depreciated for accounts; possible SBA for tax | Construction invoices, surveyor split, allowance statement | Used for 3% SBA-style schedule |
| Integral features | May qualify for special rate capital allowances | Capital allowances survey, contractor breakdown | Excluded from SBA if entered separately |
| Loose plant and equipment | Usually separate plant and machinery | Asset register, invoices, fixed asset additions list | Not part of land depreciation calculation |
Follow these steps to turn one property purchase price into a more useful accounting and tax planning schedule.
Enter the property cost consistently. Decide whether your working includes acquisition costs such as legal fees and stamp duty, then use the same basis across your records.
Use a valuation or a cautious percentage to identify the non-depreciable land element. This is the figure most likely to be challenged if the allocation is aggressive.
Where you have a capital allowances report, remove plant, fixtures and integral features from the building base so they can be reviewed under the correct pool rules.
Use the SBA tab to estimate annual 3% relief and potential tax saving. Save the output with your year-end working papers and update it if the property is sold.
The right method depends on the size of the deal, the quality of records and how defensible the result needs to be.
Compare your site with nearby vacant or redevelopment land sales. This is useful where land value is a major part of the total price.
Estimate replacement construction cost, professional fees and developer margin, then reconcile the balance to land and location value.
Use the allocation shown in the contract or completion documents, provided it is commercially reasonable and supported by the surrounding facts.
Businesses often use the word depreciation for two different things. Accounting depreciation is the charge in the accounts that spreads an asset’s cost over its useful life. Structures and Buildings Allowance is a statutory tax relief. They can be based on related figures, but they are not the same calculation and they do not always produce the same annual amount.
For example, a company may choose to depreciate a commercial building over 40 years in its accounts based on expected useful life and residual value. For tax, the same company may claim SBA at 3% on qualifying expenditure, provided the property and records meet the rules. In the tax computation, depreciation is normally added back and capital allowances or SBA are deducted instead.
This distinction is important because a land allocation error can affect both sets of records. If land is accidentally included in the accounting depreciation base, net book value becomes too low. If land is included in an SBA claim, the business may overclaim tax relief. If fixtures are left inside the building base, the business may delay tax relief that could have been available more quickly through plant and machinery allowances.
| Question | Accounting answer | Tax answer |
|---|---|---|
| Can land be depreciated? | Normally no, because useful life is indefinite | No plant and machinery allowance; land excluded from SBA base |
| Can buildings be depreciated? | Yes, if the business accounting policy depreciates them | Tax relief may be SBA, not accounting depreciation |
| Can fixtures get faster relief? | They are depreciated under the fixed asset policy | Potential plant and machinery allowances may apply |
| What evidence matters? | Asset register, valuation, useful life policy | Invoices, allowance statement, valuation, capital allowances analysis |
Use these only as a reasonableness check. Real allocations vary by site, age, planning potential, replacement cost and market conditions.
Location value can dominate, especially where redevelopment potential or scarcity is high.
Mixed office, retail and light industrial sites often sit in this middle range.
Large, modern buildings with high construction cost may have a lower relative land allocation.
Results vary widely depending on acreage, agricultural use, access and planning permissions.
Small allocation errors can create tax issues, poor depreciation records and confusion when a property is sold.
Applying a building depreciation rate to the entire property cost usually overstates the charge because the land element should be excluded. This can distort profit and the balance sheet.
SBA is a tax relief, not an accounting method. It needs qualifying expenditure, a relevant interest, appropriate use and records. The accounts may use a different depreciation policy.
Some property costs may qualify as plant and machinery rather than building expenditure. Leaving everything inside the structure figure can delay tax relief and weaken records.
A round number may be fine for early modelling, but HMRC-facing schedules should be supported by valuation evidence. The more material the claim, the stronger the evidence should be.
When a property is sold, accumulated SBA claims and allocation records still matter. Keep the schedule with the property file rather than deleting it at year-end.
Residential letting, furnished holiday lets, commercial property and mixed-use sites can have different tax outcomes. Do not assume one rule applies to every property type.
Use these calculators with your land allocation to build a more complete UK property investment model.
Answers to common questions about land, building value, SBA and UK property depreciation.