Quick answer: under the proposed EPC C framework, a landlord is required to spend up to £15,000 (inclusive of VAT, less any third-party grants received) on qualifying energy-efficiency improvements before a cost-cap exemption can be registered. Spending need not be in a single tax year. Once the cap is exhausted without achieving C, the exemption lasts five years and the property may continue to be let. The cap is per property, not per portfolio. The framework is a proposal as of May 2026, expected to be brought into force via secondary legislation under the Energy Act 2011.
Most landlords planning EPC C upgrades will start with a property-specific assessment (a SAP/RdSAP recalculation), then sequence the cheapest C-route measures first. Properties that cannot reach C even after £15,000 spend tend to be solid-walled pre-1900 cottages, single-skin construction, off-grid heating systems with no fabric improvements possible, or listed buildings with conservation constraints. For the full overview of the proposed framework, deadlines, grants, and exemption types, see the LetSafe pillar guide at /landlord-epc-c-upgrade-uk.
The £15,000 figure: what counts and what does not
The cap is the maximum required spend on qualifying improvements before a cost-cap exemption can be registered. Several rules govern what counts toward the cap:
- Includes: the gross cost of every recommended measure on the EPC, inclusive of VAT, labour, scaffolding, and ancillary works strictly necessary for installation
- Includes: the landlord's contribution where part-grant funding has been applied (your out-of-pocket plus any grant claimed for the same measure)
- Excludes: aesthetic restoration costs (e.g. re-rendering a wall after external wall insulation, where the original render was sound)
- Excludes: works to remedy disrepair that the landlord would owe under Section 11 Landlord and Tenant Act 1985 anyway (a failed boiler must be replaced regardless of MEES)
- Excludes: works requiring third-party consents that have been refused — those are a separate Third-Party Consent exemption
- Every cost must be evidenced: keep invoices, before/after EPCs, photographs of installed measures, and the surveyor's recommendation list
- For the full framework — deadlines, grants, and exemption types in context — read the EPC C upgrade pillar guide
Worked example 1 — a D-rated 1960s semi reaches C with £4,200
Three-bedroom semi-detached, currently EPC D (rating 62). The EPC recommends: top-up loft insulation (£550), cavity wall insulation (£900), A-rated combi boiler upgrade (£2,750).
- Total cost: £4,200 incl. VAT
- After works, new SAP rating: 72 (EPC C)
- Outcome: compliant. No exemption needed. Cap not engaged
- Landlord retains £10,800 of cap headroom unused — but this does not carry over if a further upgrade is needed in future
- Takeaway: many D-rated properties reach C with under £5,000 of targeted measures. Always start with the property-specific EPC recommendations
Worked example 2 — a solid-walled Victorian terrace exhausts the cap at £15,200 and remains EPC D
Two-bedroom mid-terrace, currently EPC E (rating 48). Solid 9-inch brick walls. No cavities. The EPC recommends: external wall insulation (£11,500), loft insulation (£500), new heating controls (£300), low-energy lighting (£200), air-source heat pump (£14,200 less £7,500 Boiler Upgrade Scheme grant = £6,700 net).
- Landlord installs all measures except the heat pump first: total £12,500. New rating: D (rating 65). Insufficient
- Landlord installs heat pump: gross cost £14,200, less £7,500 BUS grant = £6,700 out-of-pocket. Total counted toward cap: £14,200 (gross cost counts, not net)
- Cumulative qualifying spend: £12,500 + £14,200 = £26,700. Cap exceeded — but only £15,000 was required
- However, the property still rates EPC D (rating 66). The remaining cap headroom is irrelevant because cap is now exhausted
- Outcome: register a cost-cap exemption on the PRS Exemptions Register. 5-year exemption applies
- Note: the Boiler Upgrade Scheme grant counts toward the gross spend, not the cap. The landlord cannot 'spend' the £7,500 again
- Takeaway: gross qualifying spend matters for the cap calculation. Net out-of-pocket is what affects your cashflow — but does not change cap arithmetic. See the EPC C landlord upgrade pillar for the typical sequencing of measures
Worked example 3 — a Grade II listed cottage with no qualifying measures
Detached Grade II listed cottage built 1750. EPC F (rating 35). Solid wall construction. Solid floor. Single-glazed timber-frame windows. Local conservation officer has refused consent for external wall insulation, internal wall insulation that would obscure original lime plaster, double glazing in original frames, and a heat pump in the curtilage.
- Landlord obtains written conservation officer refusals for each measure
- Landlord installs the only permitted measure: top-up loft insulation in the cottage's attic where it does not affect the lime-plastered first-floor ceilings (£450) and low-energy lighting (£200)
- Total spend: £650
- Property rating after works: still EPC F (rating 37)
- Outcome: register a Third-Party Consent exemption (not a cost cap exemption) supported by the conservation officer refusals. 5-year exemption applies
- Takeaway: where third-party consent has been refused, the relevant exemption is Third-Party Consent — the £15,000 cap is not engaged because the works could not be done at all. Keep written refusals on file — the PRS Exemptions Register requires upload of the supporting evidence
The listed-building carve-out
Listed buildings are not automatically exempt from MEES. The carve-out is narrower than commonly believed.
- Buildings listed under the Planning (Listed Buildings and Conservation Areas) Act 1990 are exempt from the requirement to have an EPC where compliance with the EPC recommendations would unacceptably alter the character or appearance of the building
- Critically: 'no EPC required' is not the same as 'no MEES compliance required.' Where an EPC has been commissioned (e.g. at sale or assignment), it remains valid for 10 years and MEES applies normally
- Where works are permitted by the conservation officer, they must be done up to the cost cap. Where they are refused in writing, the Third-Party Consent exemption applies
- Local listings (in conservation areas, but not on the national list) do NOT enjoy the listed-building EPC carve-out — they may rely on Third-Party Consent exemptions only where consent has actually been refused
- Always commission a current EPC even on a listed property — without one, you cannot evidence the rating, cannot register an exemption, and may face a £1,000 false-information penalty for a misrepresentation to the register
Grants and the cost cap interaction
Government grants and energy-supplier obligations reduce the landlord's out-of-pocket cost but, in most cases, do not reduce the cap because the cap counts gross qualifying spend.
- ECO4 (Energy Company Obligation 4): tenant-eligibility-based. Where the tenant qualifies, the energy supplier delivers measures at zero or low cost to the landlord. The gross cost of the measures installed counts toward the £15,000 cap
- Boiler Upgrade Scheme (BUS): £7,500 toward an air-source or ground-source heat pump. The gross installed cost counts toward the cap
- Great British Insulation Scheme (GBIS): insulation grants for low-income areas/tenants. Counts gross toward the cap
- Implication: a landlord with eligible tenants and access to ECO4 can deliver substantial qualifying works at very low out-of-pocket cost while still exhausting the cap relatively quickly — meaning an exemption can be registered without significant private spend
- Always retain grant award documentation alongside contractor invoices to evidence the gross spend figure if challenged on the register
How to register a cost-cap exemption
Exemptions are not self-certifying. Each must be registered on the PRS Exemptions Register at gov.uk before the property is let or a tenancy continued past the deadline.
- Access the register at gov.uk/guidance/private-rented-property-minimum-energy-efficiency-standard-landlord-guidance
- Upload the current EPC, contractor invoices totalling at least £15,000 gross, and (if applicable) grant documentation
- Provide a signed declaration that all qualifying measures recommended on the EPC have been attempted, in priority order, until the cap was exhausted
- Exemption lasts 5 years from registration. After 5 years, the landlord must commission a new EPC and reassess — the technology and cost landscape may have shifted
- Unregistered exemptions provide no protection. Letting an F-rated property today without a registered exemption already attracts a civil penalty up to £5,000 per property
- The proposed EPC C framework retains this register architecture — the principal change is the rating threshold (E → C) and the cap level (£3,500 → £15,000)
Cap planning across multiple tax years
Qualifying spend does not have to be incurred in a single year. Spreading works across tax years can be tax-efficient and helps cashflow.
- Capital improvements (e.g. cavity wall insulation, external wall insulation) are generally not deductible against rental income in the year incurred — they form part of the property's base cost and reduce Capital Gains Tax on eventual sale
- Revenue items (e.g. boiler servicing, replacement-of-like-for-like) may be deductible against rental profits in the year incurred under HMRC's repairs principle
- Get specific tax advice — the line between 'capital' and 'revenue' on energy upgrades is contested. The Furniture Replacement Domestic Items Relief does not extend to fabric improvements
- Sequencing: start with the lowest-cost-per-EPC-point measures first (typically loft insulation, draught-proofing, LED lighting). Save heat-pumps and external wall insulation for later if cashflow permits — the EPC C landlord guide breaks down costs by band
- Begin work well before the 2028/2030 deadlines — last-minute demand will push installer prices up. ECO4 grant funding rounds are first-come-first-served and oversubscribed
Frequently asked questions
Is the £15,000 cost cap law yet?+
No. As of May 2026, the £15,000 cap is part of the proposed framework for raising MEES from EPC E to EPC C. The current legally enforceable cap under the Energy Efficiency (Private Rented Property) (England and Wales) Regulations 2015 remains £3,500 incl. VAT for EPC E compliance. The 2028/2030 deadlines and £15,000 cap are expected to be enacted via secondary legislation under the Energy Act 2011 before April 2028. For the full proposed framework, see the LetSafe EPC C upgrade pillar guide at /landlord-epc-c-upgrade-uk. Source: gov.uk DESNZ consultation outcomes 2024-2026; Energy Act 2011 s.43.
Does the £15,000 cost cap apply per property or per portfolio?+
Per property. Each property is assessed on its own EPC, its own recommended measures, its own cumulative spend, and its own exemption registration. There is no portfolio-wide cap that lets a landlord 'cross-subsidise' a difficult property from spending allocated to an easy one. Conversely, a single property exhausting the £15,000 cap does not affect any other property in the same landlord's portfolio. Source: Energy Efficiency (Private Rented Property) Regulations 2015 reg.2 (property-by-property framework retained in the proposed amendments).
What if I have already spent £3,500 on EPC E compliance — does that count toward the £15,000 cap?+
Yes, where the existing spend is on measures that also feature on the current EPC's recommended-improvements list. Qualifying spend is cumulative and historical — a landlord who has already installed cavity wall insulation, loft top-up, and a new A-rated boiler to clear the EPC E cap should retain those invoices and count them toward the £15,000 cap. You will need contractor invoices, dated installation certificates (e.g. CIGA for cavity insulation), and a current EPC showing the post-works rating. Keep all records for a minimum of 7 years after the exemption is registered.
Can I count my time managing the project toward the cap?+
No. The cap counts third-party costs only — contractor invoices, materials, surveyor reports, building-regulations sign-offs. Landlord time, mileage, and administrative overhead do not count. This includes time spent managing tradespeople, sourcing quotes, or attending site. The £15,000 cap is meant as a cash-out test, not an effort test. For a structured project plan including all qualifying measures by EPC band, see the landlord EPC C upgrade UK guide at /landlord-epc-c-upgrade-uk.
What happens at the end of the 5-year exemption?+
The landlord must commission a new EPC, reassess the recommended measures, and decide whether the property can now reach C with further qualifying spend. The cost-cap exemption can be re-registered if the cap was exhausted previously and no new cost-effective routes to C have emerged — but the test is renewed each time, not automatic. New technologies (e.g. cheaper heat-pumps, improved insulation systems) may make C achievable on properties previously thought unreachable. Plan for re-assessment at year 4 of the exemption period.
Is there a separate exemption for listed buildings?+
Listed buildings are exempt from the requirement to hold an EPC where compliance with the EPC recommendations would unacceptably alter character or appearance. This is a separate route from the cost-cap exemption. Where an EPC has been commissioned anyway (e.g. on sale), MEES applies to the property and the Third-Party Consent exemption is the usual route where conservation officer consent has been refused for specific measures. Local-listing properties (in conservation areas but not nationally listed) do not enjoy the listed-building EPC carve-out. Source: Energy Performance of Buildings (England and Wales) Regulations 2012 reg.5(c).