Cheapest EPC Improvements: Complete Cost-Effectiveness Ranking
Maximise your EPC improvement budget by prioritising the best value upgrades
Affordable energy efficiency materials and quick-win improvements for landlords
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Not all EPC improvements offer the same value for money. Understanding the cost per EPC point helps you prioritise improvements that deliver the biggest rating boost for your budget. This guide ranks every common improvement by cost-effectiveness.
The difference in value can be stark: a hot water cylinder jacket costs around £35 per EPC point, while triple glazing can cost over £1,000 per point. By starting with the most cost-effective improvements, you can often reach your target rating without expensive major works.
Cost Per Point Explained
Cost per EPC point is calculated by dividing the total installation cost by the typical number of EPC points gained. This metric allows you to compare very different improvements on a level playing field.
Example Calculation
Cavity Wall Insulation
Cost: £1,200 / Points: 10 = £120/point
Excellent value
Double Glazing
Cost: £6,000 / Points: 7 = £857/point
Lower value for EPC purposes
Complete Cost-Effectiveness Ranking
Here is every common EPC improvement ranked by cost per point, from most to least cost-effective. Use this table to plan your upgrade sequence.
| Rank | Improvement | Cost Range | EPC Points | £/Point | Priority |
|---|---|---|---|---|---|
| 1 | Hot water cylinder jacket | £20-£50 | 1-2 | £25-£35 | |
| 2 | Pipe insulation | £50-£150 | 1-2 | £50-£75 | |
| 3 | Loft insulation top-up | £400-£600 | 4-8 | £65-£100 | |
| 4 | Draught proofing | £200-£400 | 2-4 | £75-£100 | |
| 5 | LED lighting | £100-£200 | 1-2 | £75-£100 | |
| 6 | Cavity wall insulation | £800-£1,500 | 8-12 | £100-£125 | |
| 7 | Smart heating controls | £200-£400 | 2-4 | £100-£150 | |
| 8 | TRVs (radiator valves) | £150-£300 | 1-2 | £100-£200 | |
| 9 | Floor insulation (suspended) | £800-£1,500 | 2-4 | £300-£500 | |
| 10 | New condensing boiler | £2,500-£4,000 | 5-10 | £350-£500 | |
| 11 | Air source heat pump* | £3,500-£7,500 | 10-20 | £350-£500 | |
| 12 | Solar PV (3-4kW) | £5,000-£8,000 | 5-10 | £700-£1,000 | |
| 13 | Double glazing (full house) | £4,000-£8,000 | 5-10 | £700-£1,000 | |
| 14 | Internal wall insulation | £8,000-£14,000 | 10-15 | £700-£1,000 | |
| 15 | External wall insulation | £10,000-£20,000 | 12-18 | £800-£1,200 | |
| 16 | Triple glazing | £6,000-£12,000 | 6-12 | £900-£1,200 |
*Heat pump cost shown after BUS grant of up to £7,500. Star = essential quick win, Check = good value, Triangle = consider carefully.
Quick Wins (Under £500)
These improvements should be completed first on almost every property. They offer the best value and often require minimal disruption. Combined, they can gain 6-12 EPC points for under £800.
Hot Water Cylinder Jacket
Cost: £20-£50 | Points: 1-2 | £/Point: ~£30
If you have an uninsulated hot water cylinder, this is the single best value improvement available. Takes 10 minutes to fit and can be DIY.
Pipe Insulation
Cost: £50-£150 | Points: 1-2 | £/Point: ~£60
Insulate all accessible hot water pipes, especially in unheated areas like lofts and under floors. Easy DIY project.
LED Lighting Throughout
Cost: £100-£200 | Points: 1-2 | £/Point: ~£100
Replace all bulbs with LED. Focus on fixed lighting (ceiling lights) as these are what the EPC assessor checks. Simple DIY task.
Draught Proofing
Cost: £200-£400 | Points: 2-4 | £/Point: ~£85
Seal gaps around windows, doors, loft hatches, and letterboxes. Professional installation ensures quality and proper ventilation balance.
Smart Heating Controls
Cost: £200-£400 | Points: 2-4 | £/Point: ~£120
Smart thermostats (Hive, Nest, tado) with room-by-room temperature control. Improves EPC rating and reduces tenant energy bills.
Medium Investments (£500-£2,000)
If quick wins do not get you to your target rating, these medium-cost improvements offer the next best value. Cavity wall insulation in particular is a game-changer for properties built between 1930 and 1990.
Medium Investment Options
| Improvement | Low Estimate | High Estimate |
|---|---|---|
| Loft insulation (top-up to 300mm)4-8 points. Essential if current insulation is thin. | £400 | £600 |
| Loft insulation (full installation)6-10 points. For properties with no existing insulation. | £600 | £1,000 |
| Cavity wall insulation8-12 points. Best value medium investment. | £800 | £1,500 |
| Floor insulation (suspended timber)2-4 points. Worthwhile if accessible from below. | £800 | £1,500 |
| Secondary glazing2-4 points. Good for listed buildings. | £1,500 | £3,500 |
Costs for typical 3-bedroom property. Get multiple quotes for accurate pricing.
Major Investments (£2,000+)
Major investments should only be considered if lower-cost options cannot achieve your target rating. While these improvements gain significant points, the cost per point is much higher than quick wins and medium investments.
Major Investment Options
| Improvement | Low Estimate | High Estimate |
|---|---|---|
| New A-rated condensing boiler5-10 points. Best if boiler is 15+ years old. | £2,500 | £4,000 |
| Air source heat pump (after BUS grant)10-20 points. Major EPC boost, significant running cost savings. | £3,500 | £7,500 |
| Double glazing (full house)5-10 points. Consider only if windows need replacing anyway. | £4,000 | £8,000 |
| Solar PV (3-4kW)5-10 points. Also generates income/savings. | £5,000 | £8,000 |
| Internal solid wall insulation10-15 points. For solid wall properties only. | £8,000 | £14,000 |
| External solid wall insulation12-18 points. May need planning permission. | £10,000 | £20,000 |
Consider the cost cap exemption if total spending will exceed £10,000 without reaching EPC C.
DIY vs Professional Installation
Some improvements can be completed as DIY projects, reducing costs further. However, certain improvements must be professionally installed to be recognised on an EPC assessment.
DIY Suitable
- Hot water cylinder jacket
- Pipe insulation
- LED lighting replacement
- Basic draught excluders (doors)
- Loft insulation top-up (if accessible)*
- Radiator reflector panels
*Professional install required for EPC recognition in some cases
Professional Required
- Cavity wall insulation
- Solid wall insulation (internal/external)
- Boiler installation (Gas Safe required)
- Heat pump installation (MCS certified)
- Window installation (FENSA/CERTASS)
- Solar PV installation (MCS certified)
Must be installed by certified professionals for warranty and EPC recognition
When Cheap Is Not Always Best
While cost-effectiveness is important, choosing the cheapest option is not always wise. Poor quality installation can lead to problems that cost more to fix than doing it properly the first time.
Strategic Approach
The most effective strategy combines cost-effectiveness ranking with practical considerations. Follow this approach:
Get your baseline
Commission a current EPC to know your exact score and recommended improvements.
Calculate points needed
Subtract your current score from 69 (minimum C rating). This is your target.
Complete all quick wins
Do every applicable quick win regardless of points needed. They are so cheap it is always worth it.
Check cavity walls
If applicable and unfilled, this is almost certainly your next step.
Reassess
Get a new EPC. You may now be at C, or close enough that only minor additional work is needed.
Consider major works only if needed
If still short, evaluate the remaining gap and choose the most cost-effective path to close it.
Your Next Steps
Sources
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Complete Upgrade Cost Guide
Comprehensive breakdown of all improvement costs by property type.