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EPC E → C upgrade for Edwardian semi (pre-1919)
Edwardian semis combine Victorian-era fabric with slightly larger floor areas — running cost is meaningfully higher than a terrace of the same age, and solid walls again dominate the upgrade spend.
Upgrade measure stack
Cheapest-first ordering — calculator stops adding measures once the gap to C closes.
| Measure | Cost | SAP uplift |
|---|---|---|
| Loft insulation top-up to 270mm | £450 | +2.0 |
| Full LED lighting retrofit | £250 | +1.0 |
| Thermostatic radiator valves + controls | £400 | +1.0 |
| Upgrade to modern double glazing | £6500 | +4.0 |
| Air-source heat pump (BUS-eligible) | £11000 | +10.0 |
| Solid wall insulation (internal or external) | £12000 | +12.0 |
| Total | £30600 | to band C |
What's specific about this archetype
Unlike Victorian mid-terraces, Edwardian semis have two exposed external walls to insulate — bumping the cost but also the SAP gain. EWI is usually easier here than on terraces because the side wall faces a driveway or garden rather than the street. If you're targeting a heat pump, do EWI first — undersized fabric makes heat pumps run poorly.
Model your exact property
The figures above use a reference archetype. Your real floor area, mortgage balance, current energy bill and exact current band will shift the numbers. Use the full EPC upgrade calculator for a customised version, the insulation savings calculator to choose between competing fabric measures, and BUS grant eligibility if a heat pump is on the shortlist.
Other era archetypes
| Archetype | Start → Target | Net cost | Annual saving |
|---|---|---|---|
| Victorian terrace (pre-1919) | EPC E → C | £23100 | £360/yr |
| Edwardian semi (pre-1919) (this page) | EPC E → C | £23100 | £390/yr |
| 1930s semi (interwar) | EPC D → C | £11850 | £231/yr |
| 1930s terrace | EPC D → C | £11850 | £187/yr |
| 1930s detached | EPC D → C | £11850 | £286/yr |
| 1960s semi | EPC D → C | £5350 | £171/yr |
| 1960s ex-council semi | EPC D → C | £10750 | £143/yr |
| 1970s detached | EPC D → C | £5350 | £216/yr |
| 1980s semi | EPC C → B | £4150 | £90/yr |
| 1980s flat | EPC C → B | £4600 | £63/yr |
| New-build detached (post-1995) | EPC B → A | £4150 | £84/yr |
| New-build flat (post-1995) | EPC B → A | £4600 | £49/yr |