Home Insulation vs Solar Panels: What to Install First?
Short answer
Always insulate first. Reducing heat loss makes solar panels more effective and lowers the system size you need.
Which suits you
Home Insulation: All homes especially older
Solar Panels: Homes with good insulation
Side by side
| Criteria | Home Insulation | Solar Panels |
|---|---|---|
| Upfront cost | £454–£9,114 | £3,160–£12,780 |
| Could save (est.) | up to £478/yr | up to £555/yr |
| Efficiency | 35% heat loss reduction | 20-25 year lifespan |
| Government grant | varies by nation | 0% VAT |
| Carbon impact | Low carbon | Higher carbon |
| Installation time | 1–3 days | 1–2 days |
| Best for | All homes especially older | Homes with good insulation |
Which should you choose?
Always insulate first. Reducing heat loss makes solar panels more effective and lowers the system size you need.
If you’re primarily concerned with upfront cost, Solar Panels (typically £4500–£8000) is generally the lower-cost option. If you want potentially lower running costs and a smaller carbon footprint long-term, Home Insulation may offer better long-term value.
Home Insulation: pros and cons
Where it wins
- 35% heat loss reduction efficiency
- Could save up to £478 a year
- Lower carbon footprint
Where it struggles
- Higher upfront cost (£300–£2500)
- Best suited to All homes especially older
- May need a property assessment first
Solar Panels: pros and cons
Where it wins
- Lower upfront cost (£4500–£8000)
- Could save up to £555 a year
- Best suited to Homes with good insulation
Where it struggles
- 20-25 year lifespan only
- Higher carbon emissions
- Less future-proof
Questions about home insulation and solar panels
Which is cheaper — home insulation or solar panels?
Which saves more money — home insulation or solar panels?
Which is more efficient — home insulation or solar panels?
Can I install both home insulation and solar panels?
Do both qualify for government grants?
Get quotes for either, or both
Tell us about your home and installers who cover your postcode may contact you.