Stone cottage with a stone-tiled roof and a cottage garden

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Mews house and cottage

Usual measures: Breathable IWI, loft, floor. Watch-out: Space-saving thin systems.

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Typical prices

Mid-terrace prices

Installed, inc. VAT

Internal wall insulation (whole home)£7,000–£14,000
Loft insulation (new or top-up)£500–£1,000
Suspended floor insulation£1,200–£3,000
Draught-proofing£250–£600

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Before grants · updated 11 October 2026 · a survey confirms the final figure.

Read the full guide: Terraced homes

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At a glance

Construction, heat loss and watch-outs

Typical construction: Small, solid walls, low ceilings
Where heat is lost: Walls and roof
Usual measures: Breathable IWI, loft, floor
Watch-outs: Space-saving thin systems

Recommended

The insulation we usually recommend

With the mid-terrace price for each.

Breathable IWI for period homes

Wood-fibre, cork or hemp-lime systems that let solid walls stay dry.

Victorian, Georgian, listed, stoneMid-terrace: £7,000–£14,000

Thin internal liners and aerogel

Slim aerogel or thin boards where floor space matters.

Small rooms, flats, single cold wallsPriced after survey

Loft insulation

Mineral wool laid between and across the joists to 270–300 mm so heat stays in the rooms below.

Lofts with little or no insulationMid-terrace: £500–£1,000

Suspended timber floor insulation

Mineral wool or rigid board between the joists with an airtight membrane.

Victorian, Edwardian, 1930s homesMid-terrace: £1,200–£3,000

Draught-proofing

Sealing doors, windows, letterboxes, hatches, floorboards and unused chimneys — every home's quick win.

Every home; quick winMid-terrace: £250–£600

Prices

Mid-terrace price column

Every insulation measure for this property type, installed and including VAT, before grants.

Insulation price ranges by property type
Measure	Mid-terrace
Loft insulation (new or top-up)	£500–£1,000
Loft clearance and replacement	£1,200–£2,500
Room-in-roof	£3,500–£7,000
Cavity wall insulation	£800–£1,500
Cavity extraction and refill	£2,500–£4,500
Internal wall insulation (whole home)	£7,000–£14,000
External wall insulation + render	£9,000–£15,000
EWI with brick slip finish	£12,000–£20,000
Re-render only (K Rend silicone)	£4,000–£7,500
Suspended floor insulation	£1,200–£3,000
Draught-proofing	£250–£600
Whole-house fabric package	£15,000–£30,000

Indicative ranges for London and the South East, supplied and installed, including VAT, before grants. Updated 11 October 2026. A survey confirms your final price.

Price my insulation

Start with a surveyBook a condensation risk analysis / u-value calc — £75–£150 each, credited against your installation if you go ahead.Book a survey Planning more than one measure?Book a retrofit assessment (pas 2035) — £350–£650, credited against your installation if you go ahead.Book a survey

Grants and savings that may help

ECO4Closes in 73 days
Up to fully funded; paid by energy suppliers per measure
Warm Homes: Local Grant
Grant via local councils (£960m nationally in 2026/27)
Social Housing Fund
Landlord-led bids
0% VAT
Saves 20% VAT
Local schemes
Varies

Check eligibility in 60 seconds

Eligibility depends on your circumstances and is confirmed by evidence and the funder or council.

0% VAT on energy-saving materials

Insulation, solar panels, batteries and heat pumps installed in homes in Great Britain are zero-rated for VAT until 31 March 2027. Windows and doors are not included.

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Other property types

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Price insulation for your mews house and cottage

See a price range for your property type in two minutes, with grants and 0% VAT applied where they fit. A survey always confirms the final figure.

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