Planning Permission for Landlords: The Tax-Aware Short Guide

If you are thinking about changing the use of a property (the flat above a shop to a residential let, the garage to an HMO room, the agricultural barn to a dwelling, the commercial unit under Class MA), this is the orientation map. The planning regime decides whether and how you can make the change. The tax regime decides what the change will cost you on top.

This is the tax-aware short guide. It walks the landlord-side starting points: when permission is needed under TCPA 1990 s.55; how the Use Classes Order and the consolidated Class E work; when the General Permitted Development Order can grant permission automatically (with Class MA the headline route for commercial-to-residential); the Community Infrastructure Levy and the s.106 obligations that can bite at chargeable development; and the chain of tax consequences (capital-vs-revenue, ATED, VAT, SDLT, the Part 8ZB transactions-in-UK-land trap for landlords who develop-to-sell). Each section is the orientation; the deep mechanics live on the specialist pages it links out to.

When Permission Is Needed: The s.55 Definition

Town and Country Planning Act 1990 s.55(1) defines "development" as "the carrying out of building, engineering, mining or other operations in, on, over or under land, or the making of any material change in the use of any buildings or other land". Two trigger limbs:

• Operations on the land. Building works, engineering operations, mining. Extensions, additions, demolition-plus-replacement, and any substantive structural change typically engages this limb.
• Material change in the use of any buildings or other land. Movement between Use Classes; conversion to a different functional use; intensification of an existing use to a materially different character.

s.55(2)(f) carves out movement WITHIN the same Use Class. Movement WITHIN a class needs no permission. Movement BETWEEN classes typically does, unless the GPDO 2015 grants Permitted Development cover. Movement within a Sui Generis use (a use not in any class, like a drinking establishment or a large HMO over 6 persons) always needs permission.

The landlord's starting point: identify the current Use Class of the property, identify the proposed Use Class, and check whether the movement is intra-class (no permission), GPDO-allowed (prior-approval or no application), or requires a full application.

The Use Classes Order and the Consolidated Class E

The Town and Country Planning (Use Classes) Order 1987 (SI 1987/764) was substantially amended by SI 2020/757, which created the consolidated Class E from 1 September 2020. Class E bundles a wide range of commercial uses that used to live in separate sub-classes:

• Former Class A1 (shops).
• Former Class A2 (financial and professional services).
• Former Class A3 (restaurants and cafés).
• Former Class B1 (business, office and light industrial).
• Former Class D1(a) (medical and health services).
• Former Class D2(e) (gyms and indoor sport).

Within Class E, movement is now permitted without planning permission (under the s.55(2)(f) carve-out). A Class E ground-floor unit can switch between shop, office, café, gym or clinic without an application. Residential uses (Class C1 hotels, C2 residential institutions, C3 dwellinghouses, C4 small HMOs) remain separate. The other landlord-relevant classes are F.1 (learning and non-residential institutions), F.2 (local community), B2 (general industrial), B8 (storage and distribution), and Sui Generis (uses not in any class, including drinking establishments and HMOs over 6 persons).

Permitted Development: The GPDO 2015 and Class MA

Where movement between classes is needed, the General Permitted Development (England) Order 2015 (SI 2015/596) may grant permission automatically. Schedule 2 catalogues permitted-development rights by category. The landlord-relevant headline routes:

• Class MA (commercial, business and service to dwellinghouses). Introduced by SI 2021/428 effective 1 August 2021. Allows change from Class E to Class C3 (dwellinghouses) subject to: maximum 1,500 sqm floor space; building vacant for at least 3 months immediately prior; not on specially-designated land (national park, AONB, conservation area, subject to specific exclusions). A prior-approval application to the local planning authority is required, typically decided within 8 weeks. This is the headline route for commercial-to-residential conversion in 2026.
• Classes A and AA. Single-storey rear extensions; additional storeys on existing dwellings. Conditions on volume, height and curtilage.
• Class L. HMO conversion routes (within the Use Class boundaries).
• Class Q. Agricultural building to dwelling. Narrowed by SI 2024/579, which tightened prior-approval conditions and reduced the previous flexibility. Older firm briefings that quote pre-2024 Class Q conditions are out of date.
• Class R. Agricultural building to flexible commercial uses.

"Permitted development" does not mean "no procedural step". Most landlord-relevant PD classes require a prior-approval application as a procedural step short of full permission. Conditions are strict and fact-sensitive; the local planning authority can refuse prior approval on specified grounds.

The Community Infrastructure Levy

The Community Infrastructure Levy sits on Planning Act 2008 Part 11 (ss.205 to 225) and the CIL Regulations 2010 (SI 2010/948 as amended). CIL applies to "chargeable development" including:

• New build over 100 sqm internal floor area.
• Creation of new dwellings (regardless of size).
• Certain change-of-use development creating new floorspace.

Rates are local-authority set, published in each charging authority's CIL charging schedule. The range across England runs from £0 (charging authorities that have not adopted CIL) to £400 or more per sqm in high-charging boroughs and town-centre zones. A new dwelling created from a Class MA conversion at 110 sqm in a borough charging £100 per sqm faces an £11,000 CIL liability. Key landlord-relevant exemptions:

• Self-build (reg 42). Single-dwelling owner-occupier construction. Not available where the landlord is letting the finished dwelling.
• Annexe and extension (reg 42A). Annexes or extensions to existing dwellings.
• Social housing (regs 49 to 52).
• Charitable (regs 54 to 58).

Every exemption requires formal advance notice, procedural compliance and a 3-year clawback discipline. For the operational mechanics see our complete guide on the Community Infrastructure Levy.

s.106 Planning Obligations

TCPA 1990 s.106 allows bespoke planning obligations negotiated per development. Common categories:

• Affordable housing contributions (typically engaged on developments above a per-LA threshold, often 10 units).
• Highway works (often in parallel with Highways Act 1980 s.278 agreements).
• Education contributions.
• Open-space and play-space contributions.

s.106 obligations must satisfy the CIL Regs reg 122 five-tests for enforceability: necessary; directly related; fairly and reasonably related in scale and kind to the development. The pre-Levelling-up and Regeneration Act 2023 pooling restriction at CIL reg 123 (a cap of 5 s.106 obligations funding the same infrastructure item) has been REPEALED by LURA 2023 Part 4. CIL and s.106 can coexist on the same development but cannot fund the same infrastructure item (Planning Act 2008 s.218 and CIL reg 122). The LURA 2023 framework also signals a phased replacement of CIL by a new Development Levy in stages; the in-force position for any given development needs verifying at the planning-application date.

The Tax Consequences: Capital vs Revenue

Planning application fees, professional planning-consultant fees, architect fees, structural engineer fees and the substantive build cost are CAPITAL expenditure under ITTOIA 2005 s.33 (for individuals) and CTA 2009 s.53 (for companies). Capital expenditure is not deductible against rental income; it is added to the property's base cost for CGT under TCGA 1992 s.38 ("enhancement expenditure").

The capital-vs-revenue line is decisive and the borderline cases are fact-sensitive:

• Roof repair, like-for-like. Replacing existing slate with new slate is repair: revenue-deductible against rental income in the year incurred. Professional fees on the repair (roofer, surveyor) deductible alongside.
• Loft dormer conversion. Adds floor area; new room with windows and stairs; requires planning permission for the external alteration. Capital expenditure. Build cost plus planning fees plus architect fees all added to base cost.
• Border case. A roof replacement that incidentally creates additional headspace without forming a usable new room may fall on the revenue side; a roof replacement that forms a usable additional bedroom moves to the capital side.

The structural consequence of the capital classification: a £80,000 loft conversion on a property later sold at a £112,000 gain reduces the CGT base. At 24 percent residential CGT, the £80,000 saves £19,200 in tax. The same £80,000 if it had been revenue-deductible against rental income would have saved at the landlord's marginal income-tax rate (potentially 40 percent or 45 percent, equating to £32,000 or £36,000). Capital classification is structurally less valuable for tax purposes than revenue classification. For the deeper test see the capital-vs-revenue cluster in the landlord-tax-essentials pages.

Change-of-Use ATED Entry

ATED (the Annual Tax on Enveloped Dwellings, FA 2013 Part 3) applies to "dwellings" held in corporate envelopes where value exceeds £500,000 per dwelling. A change of use from non-dwelling to dwelling can bring a property into ATED scope post-conversion. The corporate landlord converting commercial-to-residential through Class MA must plan for ATED entry at completion.

Mitigation routes:

• Property-rental business relief, FA 2013 s.133. The dwelling is let or being prepared for letting on a daily basis. Relief lost if a dwelling falls into a non-rental occupation pattern (vacant for refurbishment over 6 months, family-member occupation, sale-prep voids).
• Property-development trade relief, FA 2013 s.137. The dwelling is held as trading stock of a property-development trade.
• Charitable use relief, FA 2013 s.150.

Each relief requires a formal annual return filed within 30 days of acquisition or coming into scope, plus the daily-basis trade-business-use test maintained throughout. ATED is not automatic relief; non-filing of the return forfeits the relief and triggers full ATED at the band rate. For the operational architecture see our ATED guide.

VAT on Commercial-to-Residential Conversion

Two VAT levers engage on a commercial-to-residential conversion:

• Option to tax disapplication. Any option to tax under VATA 1994 Sch 10 para 2 that was in place on the commercial property (which a commercial landlord typically had to recover input tax on acquisition and operating costs) is automatically disapplied for the residential conversion under Sch 10 paras 5 and 6 (intended-dwellings disapplication). A developer recipient certification disapplication is also available on form VAT 1614D.
• 5 percent reduced rate on conversion services. Construction services that convert non-residential into residential, or that change the number of dwellings, qualify for the 5 percent reduced rate under VATA 1994 Sch 7A Group 6. The onward first-grant-of-major-interest in a new dwelling is zero-rated under Sch 8 Group 5, making the 5 percent input fully recoverable.

The combined VAT economics on a commercial-to-residential conversion are highly favourable for the landlord-developer who structures the route correctly. The mistake is paying standard-rate VAT on conversion services (commonly happens when the contractor invoices at 20 percent because the project was misclassified) and then trying to recover the differential.

SDLT Non-Retrospection

SDLT is charged at acquisition based on the use at the effective date of transaction (FA 2003 s.116). A change of use AFTER acquisition does NOT retrospectively recalculate the SDLT due; the original transaction is closed. A landlord who acquired a property as mixed-use (commercial ground floor plus residential upper floors) and pays mixed-use SDLT at acquisition does not owe additional SDLT if they later convert the ground floor to residential.

The cost shifts forward: a FUTURE sale will use the use at the date of that sale. A commercial-to-residential conversion will mean the next buyer pays SDLT at residential rates (plus possibly the higher-rates additional-dwelling surcharge for buyers with other residential property). This is the buyer's problem, not the seller-landlord's; but a sophisticated buyer will price the SDLT differential into the offer.

The Part 8ZB and Part 9A Trap on Planning-Driven Disposals

The most-missed consequence of a planning decision on a long-held BTL: the application for planning permission, combined with the substantive development and an intended disposal, sits squarely inside the transactions-in-UK-land regime at CTA 2010 Part 8ZB (companies) and ITA 2007 Part 9A (individuals).

Condition D (the development main-purpose test under s.356OB and s.517B) catches a landlord who acquires-to-let and then develops-to-sell. The original long-hold investment intent does NOT insulate the new development from trading classification. Planning permission is the obvious HMRC signal that intent has shifted. Worked example: a landlord holds a 1990s semi as a BTL for 12 years (acquired £180,000, current letting value £350,000). She secures planning permission to demolish and replace with a 4-flat development; total build cost £600,000 plus ~£80,000 planning plus ~£40,000 sales; sells the 4 flats off-plan for £1,400,000. Gain: £500,000. She might assume CGT at 24 percent = £120,000. Wrong. Condition D engages on the development decision; the £500,000 is recast as trading profit; income tax at 45 percent plus Class 4 NIC ≈ £240,000 or more. The C8 sibling page investor or developer is the decision-guide.

The Capital Allowances Reset at Conversion

Capital allowances under CAA 2001 Part 2 (plant and machinery) and Part 2A Structures and Buildings Allowance (3 percent straight-line per FA 2020 s.30) apply to qualifying non-residential building expenditure. SBA does NOT apply to dwellings. A commercial-to-residential conversion ends SBA eligibility on the converted floor space from the conversion date; any unused SBA carries forward only against any remaining commercial floor area.

The plant-and-machinery allowance picture also resets at conversion. Items installed in the commercial property pre-conversion may have qualified for plant-and-machinery allowances; the conversion to residential disqualifies most of those items from continued allowance treatment (residential dwellings are largely excluded from plant-and-machinery allowance integral-features treatment). The capital allowances position needs auditing at the conversion point.

Where to Read Next

This page is the orientation map. The deeper mechanics live on:

• The Community Infrastructure Levy guide for CIL exemption mechanics, the 3-year clawback discipline, and the LURA 2023 transition.
• The investor or developer decision-guide for the Part 8ZB and Part 9A four-conditions test, the 6-month associated-persons window, and the planning levers that keep a portfolio on the investment side.
• The ATED cluster for the FA 2013 Part 3 architecture, the £500,000 entry threshold, and the daily-basis relief discipline.
• The VAT-on-property cluster for the Sch 10 option-to-tax architecture, the Sch 7A Group 6 5 percent reduced rate on residential conversion services, and the Sch 8 Group 5 zero-rating on new-dwelling first-grants.
• The SDLT cluster for residential, non-residential and mixed-use classifications under FA 2003 s.116.
• The capital-allowances cluster for the SBA architecture, plant-and-machinery allowances on commercial property, and the conversion-point reset.

The planning decision sits upstream of every one of those clusters. The decision-flow that wins is: model the tax stack BEFORE the planning application goes in, not after.