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EPC D → C upgrade for 1930s detached
Interwar detached homes are larger but still cavity-construction. Expect to pay more in absolute terms for EPC C than a semi — but the return on investment per £ is similar.
Upgrade measure stack
Cheapest-first ordering — calculator stops adding measures once the gap to C closes.
| Measure | Cost | SAP uplift |
|---|---|---|
| Full LED lighting retrofit | £250 | +1.0 |
| Thermostatic radiator valves + controls | £400 | +1.0 |
| Cavity wall insulation | £1200 | +6.0 |
| Upgrade to modern double glazing | £6500 | +4.0 |
| Air-source heat pump (BUS-eligible) | £11000 | +10.0 |
| Total | £19350 | to band C |
What's specific about this archetype
The floor-area multiplier matters here: a 140 m² detached needs more loft insulation, longer runs of radiator upgrade work, and proportionally more of every measure. A heat pump can become genuinely appealing at this scale because the running-cost saving compounds over a larger space.
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) | 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 (this page) | 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 |