Group C · External wall insulation and render
Insulating (thermal) lime render
Lime render with an insulating aggregate for modest U-value gains on old walls.
Priced after survey
Insulating (thermal) lime render
Every job like this is different, so we measure first and give you a fixed written quote. The price depends on:
- The area and access
- What's there now and its condition
- The system and finish you choose
No obligation — your survey confirms what suits and what it costs.
- Best for
- Listed and conservation properties where EWI is not allowed
- Guarantee or standard
- Manufacturer's guarantee, confirmed in your quote
- Time on site
- Several weeks for a typical house — thermal lime is applied in thicker coats with curing time between them.
- Typical price
- Priced after survey
What it is
What is insulating lime render?
Lime render with an insulating aggregate for modest U-value gains on old walls.
Best for: Listed and conservation properties where EWI is not allowed.
Build-up
Render only
- 1Existing wall
- 2Base coat and mesh, where the system needs it
- 3Render finish
No insulation layer — render is a finish, never sold as insulation.
Who it suits
Which homes is insulating lime render suitable for?
Is my home suitable?
Pick your property type for a straight answer on insulating lime render.
Guidance only — every home is different, and a survey confirms what suits yours.
Houses
- Detached house
- Semi-detached house
- End-of-terrace
- Mid-terrace
- Townhouse
- Mews house and cottage
- Detached bungalow
- Semi and terraced bungalow
- Chalet and dormer bungalow
- Period home
- 1930s home
- Post-war and ex-council house
- Non-traditional / system-built
- Listed building or conservation area
- Farmhouse, barn conversion or rural home
- New build or self-build
Flats and blocks of flats
Commercial and public buildings
Usually suitable Depends — a survey confirms
Not usually suitable for 5 property types
- Park and mobile home — Park and mobile homes need specialist systems, which we arrange through a partner rather than standard measures.
- Purpose-built flat — A flat's outside walls are the building's responsibility, so rendering is done as building-wide works.
- Ground-floor, top-floor flat or maisonette — A flat's outside walls are the building's responsibility, so rendering is done as building-wide works.
- Mansion block — A flat's outside walls are the building's responsibility, so rendering is done as building-wide works.
- Ex-local-authority flat or maisonette — A flat's outside walls are the building's responsibility, so rendering is done as building-wide works.
Materials and brands
What we use
Lime render with insulating aggregate for modest U-value gains on old walls.
EWI and render brands we work with
- Sto
- Weber
- K Rend
- Wetherby
- Parex
Insurance-backed EWI usually requires approved-installer status with the system holder. The exact system and brand for your home are confirmed in your written quote.
Heat, bills and EPC
What it does for your heat loss, bills and EPC
Insulating lime render adds a modest amount of insulation to an old wall while keeping it breathable. It won't match a full EWI or IWI system, but where those aren't allowed it improves comfort and reduces heat loss a little — the EPC planner shows what it means for your home.
See the EPC points and savings for your home in the EPC plannerU-value before and after, typical heat and bill saving, and EPC points — worked out for your property.Price
How much does insulating lime render cost?
Priced after survey
Jobs like this vary too much for a fair online price, so we measure first and give you a fixed written quote — with no obligation.VAT on this work
Insulation installed in homes in Great Britain is zero-rated for VAT until 31 March 2027. Other parts of a job like this — such as a new roof covering, structural work or waterproofing — may be standard-rated. Your quote shows the split.What to expect
Time on site, disruption and approvals
Time on site
Several weeks for a typical house — thermal lime is applied in thicker coats with curing time between them.
Disruption
Most of the work happens outside, so you stay in your home. Scaffolding is up for the duration, and downpipes, meters, lights and satellite dishes are moved and refitted.
Planning and building control
Like-for-like re-rendering doesn't usually need planning permission; changing the look in a conservation area or on a listed building may need permission or consent. Renewing render over a large area of wall can mean Building Regulations expect insulation to be considered at the same time — we'll tell you if it applies.
Guarantee and standard
Manufacturer's guarantee, confirmed in your quote.
60-second grant check
Could a grant help pay for it?
Grant eligibility checker
About 60 seconds · plain results: likely, possibly or not eligible
Before we start
What type of property is it?
Questions
Insulating (thermal) lime render: your questions answered
How much does insulating lime render improve a wall?
Modestly. It adds some insulation to an old wall while staying breathable — useful where EWI isn't allowed, but it won't match a full insulation system. We'll explain what's realistic for your wall.
Is thermal lime render suitable for listed buildings?
It's often used on listed and conservation properties where EWI isn't allowed, subject to listed building consent where the building is listed.
Which insulating lime product do you use?
The product is confirmed at survey for your wall and its consent requirements.
Group C
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Acrylic and silicone thin coat
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Lime render
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Begin your project
Ready to talk about insulating lime render?
Tell us about your home and we'll arrange a survey, then a fixed written quote — no obligation.