Budget 2026 and Leeds premises: what the planning and development measures mean if you are buying, extending or building

Budget 2026, published by HM Treasury on 28 October 2026, has no single headline for business property. What it does contain is a cluster of planning and development measures, plus a run of Leeds and West Yorkshire commitments, that together change the practical timetable for any business owner who wants to buy, extend or build premises in the city. This article sets out what was actually announced, what was not, and how to plan a premises project around it.

The planning measures, in plain terms

The Budget does not rewrite the planning system. It sets out four practical changes, most of them on a 2027 timetable.

Faster routine decisions, eventually. The government says it will make PlanAssist, an AI tool built by the Ministry of Housing, Communities and Local Government, available to all councils in England "by the end of 2027, subject to further testing", with the aim "to halve routine planning decision times" (Budget 2026, para 2.19). Local planning authorities will also be required to digitise and publish key planning documents as open data by the end of 2027 (Budget 2026, para 6.117).

The important words are "routine" and "subject to further testing". A small extension or straightforward change of use is the kind of decision the tool is aimed at. A new industrial unit on an awkward Holbeck site, or a listed mill conversion, will still turn on officer judgement and consultee responses.

No major building regulation changes. The government "will not make major changes to building regulations for the remainder of this Parliament", except to continue improving building safety, including implementing the Grenfell Inquiry recommendations (Budget 2026, para 6.118). For anyone pricing a fit-out or extension over the next few years, that is a degree of stability in the specification you are building to.

Biodiversity Net Gain exemption for small brownfield housing sites. Residential brownfield developments on sites up to 1.5 hectares in England are being exempted from BNG requirements, with the timeline for implementation to be set out later (Budget 2026, para 6.119). It covers residential schemes only, so it matters mainly to a business with a small brownfield site considering adding homes, and no start date is set yet.

Fewer delays on big infrastructure. Legislation will let Parliament designate critical infrastructure, and the government points to over £750bn of planned investment over ten years (Budget 2026, paras 4.39 to 4.40). For Leeds businesses this matters indirectly, through the transport projects that make a location attractive to own in.

Leeds and West Yorkshire: what is named

The Budget is unusually specific about Leeds.

• Leeds City Fund. The government will "Establish the Leeds City Fund with 100% retention of business rates growth" (Budget 2026, Table 6.1 item 76). In practice that means growth in business rates income from new and improved premises stays local to fund investment, rather than flowing back to the Treasury. The Budget does not set out how the fund will be spent or which sites it will target.
• Leeds station. The government confirms "over £300 million" for the Leeds Existing Station Programme, to be delivered by 2030, to increase capacity and improve accessibility at Yorkshire's busiest station (Budget 2026, paras 4.91 and 6.63).
• Northern Powerhouse Rail. Development continues, including a new Bradford station at the Interchange site (Budget 2026, para 4.91).
• City Investment Funds. West Yorkshire is one of seven mayoral areas receiving grant, loan and patient capital funding "to deliver city densification at a local level" (Budget 2026, para 6.45).
• Leeds College of Building. The Budget funds an expansion of the college to accommodate over 2,000 new learners as part of accelerated West Yorkshire priority projects, subject to business cases (Budget 2026, para 4.71). The document gives two different funding figures for this project in different sections, so we have not repeated either here.

West Yorkshire is not in the first wave of Business Rates Retention Zones listed in the Budget (Budget 2026, para 4.61). The Leeds City Fund is a separate, Leeds-specific commitment.

What it means if you are buying premises

For an owner-occupier buying an existing building, the planning changes are mostly background. The lender will value the building as it stands, with its current lawful use, and underwrite on your trading accounts. Where the measures do matter is if your purchase depends on a change of use or a modest extension to make the building work for you.

Lenders rarely lend against planning hope. If the building only suits your business once consent is granted, expect a condition that consent is in place before drawdown, or a valuation on existing use. Plan your timetable on current Leeds City Council decision times, not on the Budget's ambition.

Around the station and the South Bank, these commitments are a reason some businesses will prefer to own rather than lease. But no lender will lend more today on the strength of a programme due by 2030.

What it means if you are extending or building

This is where the Budget is most relevant. A business building its own unit, adding a mezzanine or extending a workshop is exposed to three things the Budget touches: planning time, specification and tax relief on the spend.

Planning time. Build contingency into your programme for decision times as they are today. If PlanAssist reaches Leeds and works as intended, treat it as a bonus.

Specification. The commitment not to make major building regulation changes this Parliament (outside building safety) reduces the risk of a mid-project specification change. It does not remove the need for building control sign-off, which lenders funding staged works will ask to see.

Tax relief on equipment. The main rate first-year allowance rises to 50% for expenditure incurred on or after 1 January 2027, and the main rate writing-down allowance falls to 12% from 1 April 2027 for Corporation Tax and 6 April 2027 for Income Tax (Budget 2026, para 6.251). Full expensing is maintained (Budget 2026, para 2.54). The Budget does not spell out exactly which assets the new first-year allowance covers, and it says nothing about the Structures and Buildings Allowance or the Annual Investment Allowance, so take advice from your accountant on how the plant and machinery in a new building should be treated and timed.

Cost pressure. The Office for Budget Responsibility expects inflation to peak at 3.8% in the first quarter of 2027 before returning to the 2% target by the third quarter of 2028 (Budget 2026, para 1.37). It also forecasts business investment flat in 2026 and down 0.5% in 2027 (Budget 2026, Table 1.1). Build cost estimates prepared this autumn deserve a contingency line.

Larger sites. The Strategic Sites Accelerator will mobilise around £700m for strategic commercial sites across the UK, with first investments targeted by the end of March 2027 (Budget 2026, para 6.98). It is aimed at strategic sites, not a single business building its own unit, but may affect the supply of employment land over time.

How lenders look at a premises project

Owner-occupier commercial mortgages are sized on the property's value and the business's ability to service the debt from profits. For a build or extension, lenders want to see a fixed-price or well-evidenced build cost, planning consent in place, a contractor and a programme, and enough equity to cover overruns. Depending on the size of the works, the right structure may be a term commercial mortgage on the existing site with a further advance, a short-term facility for the works that refinances onto a term loan at completion, or a straightforward purchase loan where the works are minor and funded from cash.

Illustrative example: a Leeds engineering business owns its unit and wants to add a second bay. With filed accounts showing comfortable profit cover, a lender may consider releasing equity from the existing building to fund part of the works, once consent and a costed build contract are in place.

What to do now

1. Check where your project sits in the planning queue. If you need consent, get pre-application advice now and build today's decision times into your purchase or build programme.
2. Separate the property question from the tax question. Talk to your accountant about the timing of qualifying equipment spend around 1 January 2027 and 1 April 2027 before you fix your fit-out programme.
3. Get the build cost evidenced. With inflation forecast to peak in early 2027, lenders will look harder at contingency.
4. Prepare your accounts pack early. Filed accounts, current management figures and a short explanation of how the new space supports trading are what most lenders read first.
5. Do not borrow against the Budget. Your loan will be sized on what the property and your business support today, not on future station or City Fund investment.

Key dates

• 28 October 2026: Budget 2026 published.
• 1 January 2027: main rate first-year allowance of 50% applies to expenditure from this date.
• 31 March 2027: Strategic Sites Accelerator aims to make its first investments by this date.
• 1 April 2027 (Corporation Tax) and 6 April 2027 (Income Tax): main rate writing-down allowance falls to 12%.
• End of 2027: PlanAssist to be available to all English councils, subject to testing; key planning documents published as open data.
• By 2030: Leeds Existing Station Programme to be delivered.

Brought to you by Business Mortgages Broker

This article was prepared by Business Mortgages Broker, which arranges owner-occupier business mortgages for UK trading companies. Founder Matt Lenzie has 25 years in financial services, raising debt and equity, and has arranged around £400m of property finance. If you are planning to buy, extend or build premises in the city, see business mortgages in Leeds for how owner-occupier lending works and what lenders will ask for.

Source: HM Treasury, Budget 2026 (HC 726), 28 October 2026. This article is general information, not tax or financial advice. Commercial Mortgages Leeds is not authorised by the Financial Conduct Authority and does not give regulated advice or personal recommendations.