The £10,000 cost cap is a key component of the 2030 EPC C requirement for rental properties. It sets a limit on how much landlords must spend attempting to reach EPC C before they can claim an exemption from the regulations.
✅ Important: Spending from 1 October 2025 counts toward the new £10,000 cap, giving landlords 5 years to plan and implement improvements strategically.
What the £10,000 Cost Cap Is
The cost cap is the maximum amount landlords must spend attempting to improve their property to EPC C before they can register for a cost cap exemption. It represents a significant increase from the current £3,500 cap for EPC E compliance.
Key Changes from 2026 Government Response
- Increased from £3,500 to £10,000 for most properties
- Proportional cap of 10% of property value for properties worth under £100,000
- Earlier start date: Spending from 1 October 2025 counts (not just from 2030)
- Enhanced exemption process with clearer evidence requirements
How the Cost Cap Works
If you spend the full cost cap amount attempting to reach EPC C and still cannot achieve it, you can register for a 5-year exemption from the requirement:
The Process
- Get improvement recommendations from a qualified assessor
- Obtain three quotes for recommended work
- Implement the most cost-effective improvements up to your cost cap
- Get a new EPC to check if C rating achieved
- If still below C: Register exemption on PRS Exemptions Register
What Qualifies as Cost Cap Spending
- Energy efficiency improvements recommended by assessor
- Materials and labour costs including VAT
- Reasonable associated costs like scaffolding or access equipment
- Professional fees for assessments and certifications
What Does NOT Count
- General maintenance or repairs not improving energy efficiency
- Cosmetic improvements like decorating
- Structural work unrelated to energy performance
- Improvements beyond EPC recommendations
Properties Under £100,000: Proportional Cap
For properties valued below £100,000, the cost cap is 10% of the property value rather than the full £10,000:
Examples of Proportional Caps
| Property Value | Cost Cap (10%) | Example |
|---|---|---|
| £60,000 | £6,000 | Low-value terraced house |
| £80,000 | £8,000 | Studio flat in former industrial area |
| £95,000 | £9,500 | One-bed flat in affordable area |
| £100,000+ | £10,000 | Full cap applies |
Property Valuation for Cost Cap
- Use professional valuation from RICS-qualified surveyor
- Market value as of October 2025 or when improvements begin
- Open market value assuming vacant possession
- Updated if significant changes occur during improvement period
Critical Timeline: October 2025 Start Date
One of the most significant changes from the 2026 government response is the earlier start date for cost cap spending:
Why October 2025 Matters
- 5-year window: October 2025 to October 2030 to spread costs
- Strategic planning: Avoid last-minute rush and inflated prices
- Access to grants: Current schemes may not be available closer to deadline
- Contractor availability: Best choice of contractors before market saturation
Recommended Timeline
| Period | Action | Benefit |
|---|---|---|
| 2025-2026 | Assessment and planning | Identify cost-effective improvements |
| 2026-2028 | Begin major improvements | Spread costs, access current grants |
| 2028-2030 | Complete final measures | Fine-tune to achieve EPC C |
How to Register a Cost Cap Exemption
If you cannot achieve EPC C within your cost cap, you must register an exemption on the PRS Exemptions Register:
Required Evidence
- Three quotes for all recommended improvements
- Invoices and receipts for all work completed
- Before and after EPCs showing rating remains below C
- Assessor recommendations confirming no further cost-effective measures
- Property valuation (if using proportional cap)
Exemption Duration and Renewal
- Valid for 5 years from registration date
- Must reapply when exemption expires
- New assessment required for renewal (technology may have improved)
- Additional spending may be required if cap increases or new solutions available
Strategic Use of the Cost Cap
Prioritising Improvements
To maximise impact within your cost cap:
- Cavity wall insulation: Highest impact per pound (typically £500-1,500, adds 10-15 SAP points)
- Loft insulation upgrade: Cost-effective if existing insulation thin (£300-500, adds 3-5 points)
- Heating system upgrade: New A-rated boiler (£2,500-3,500, adds 12-18 points)
- Smart heating controls: Relatively cheap impact (£400-600, adds 3-5 points)
- Windows and doors: Consider if budget allows (£3,000-8,000, adds 5-10 points)
Cost-Effective Combinations
- D to C (typical £6,000): New boiler + smart controls + minor insulation
- E to C (typical £8,000): Full insulation package + boiler upgrade
- F to C (may exceed £10,000): Comprehensive improvements, likely exemption needed
What Records Landlords Need to Keep
Detailed record-keeping is essential for cost cap compliance and exemption registration:
Financial Records
- All quotes received with dates and detailed breakdowns
- Invoices for completed work including VAT
- Bank statements showing payments made
- Running total of spending toward cost cap
Technical Records
- Original EPC and rating before improvements
- Assessor recommendations and improvement reports
- Updated EPCs after each phase of work
- Final EPC confirming whether C achieved
Exemption Records
- Evidence that C cannot be achieved within cost cap
- Property valuation (if using proportional cap)
- Exemption registration confirmation from PRS Register
- Annual reviews of exemption status
Common Cost Cap Mistakes to Avoid
Planning Mistakes
- Starting too late: Missing the October 2025 start date
- Not getting proper quotes: Failing to obtain required three quotes
- Exceeding the cap: Spending more than required before claiming exemption
- Poor record keeping: Inadequate documentation for exemption claims
Technical Mistakes
- Wrong improvements: Installing measures not recommended by assessor
- No intermediate EPCs: Failing to get new certificates during improvement process
- Ignoring fabric first: Upgrading heating before improving insulation
Official Resources
- Government Response: PRS Energy Performance (PDF) — Official confirmation of £10,000 cap
- PRS Exemptions Register — Register cost cap exemptions
- GOV.UK MEES Collection — Complete MEES regulatory framework
- Citizens Advice: Energy Efficiency Guidance — Independent advice for landlords
About This Guide
This guide was researched and written by the EPC Certificate UK Editorial Team, specialists in UK energy performance regulations. All information is sourced from official government publications, regulatory announcements, and industry best practice guides.