18 Cowslip Hill, Letchworth Garden City SG6 4HL

Semi-Detached house · Built 1930-1949 · 95 m² · Owner-Occupied · Boiler and radiators, mains gas

Upgrade Plan

DB for £10,725 · £5,363 a gradeGet upgrade quotes
MeasureGrantNet costSaving / yrPaybackGrade effect
Loft insulation£100 – £350£327.0 yrs+2.1 pts · reaches C
Floor insulation£800 – £1,200£6714.8 yrs+4.4 pts
Solar photovoltaic panels£3,500 – £5,500£6250+ yrs+4.1 pts
Solar water heating£4,000 – £6,000£5250+ yrs+3.4 pts · reaches B

Grants verified 20 August 2026. Costs are the register’s indicative ranges. Savings are restated at the fuel prices assumed in July 2026. Points per measure are estimated from 19.9 million certificates and rescaled to this home’s own certificate delta; the total is the register’s figure.

Running costs

£1,338
per year at grade D
£1,124
per year at grade B

The full plan saves £214 a year — a 2.0% annual return on £10,725.

Restated at the fuel prices assumed in July 2026. This certificate, assessed in 2021, states £830 a year at the prices assumed then. Modelled costs, not a bill.

Sold prices

13 January 2022£495,000
25 May 2005£260,000
4 March 2004£242,000

Estimated today: £556,300 HPI-indexed estimate, not a valuation

Schools nearby

No school in the register within reach of this postcode.

Energy data © Crown copyright, EPB Register© HM Land Registry, OGL v3We grade homes, never neighbourhoods.