01329 756935
info@arrowinsulation.co.uk

Home
Services
About
Reviews
Contact

Home
Services
About
Reviews
Contact

Author: webteam

Insulation Savings Calculator

Use our free calculator to estimate U-values for cavity walls and lofts,
and see how much you could save on energy bills each year. No sign-up required.

Insulation Calculator | U-Values & Savings | Arrow Energy Solutions

🔥 Insulation Calculator

Work out your U-values and see how much you could save

Calculated U-Value

—

W/m²K

Select options below

Outer Leaf

Material

Custom thickness (mm)

Cavity

Cavity Width

🟦

Climabead CWI

λ = 0.033 W/mK (full cavity fill)

Inner Leaf

Material

Custom thickness (mm)

Internal plaster finish

Building Regs Reference Targets

New build (Part L 2021)≤ 0.18 W/m²K

Existing dwelling retrofit≤ 0.30 W/m²K

Typical pre-insulation wall~1.0–1.6 W/m²K

Share

Calculated U-Value

—

W/m²K

Select options below

Insulation

Material Total insulation depth

Custom depth (mm)

Account for timber joist thermal bridging
~8% of ceiling area taken up by joists (realistic)

Ceiling Finish

Plasterboard thickness

Building Regs Reference Targets

New build (Part L 2021)≤ 0.15 W/m²K

Retrofit / top-up target≤ 0.16 W/m²K

Uninsulated loft (typical)~2.0–2.3 W/m²K

Share

Estimated Annual Savings

You could save about £— every year

Energy saved

—

kWh / year

Bill reduction

£—

per year

CO₂ saved

—

kg / year

What are you insulating?

Property Size

Select your property type

External wall area (m²)

Thermal Performance

Current U-value

After insulation

Heating Fuel

How do you heat your home?

Share

Ready to start saving?

Get a free, no-obligation quote from our accredited installers.
PAS 2030:2023 compliant · TrustMark registered · Covering the South of England.

Get My Free Quote →

Indicative calculations using ISO 6946 method. Savings estimates use UK Ofgem price cap (April–June 2026) and heating degree days of 2,100 (UK average, base 15.5°C). Actual figures vary with construction, occupancy, and local climate. For certified figures, contact us for a survey.

Email me my results

We'll send you a copy of your calculation, and one of our surveyors may get in touch about a free quote.

—

Your name * Email * Phone (optional) Postcode (optional) Anything else? (optional)

By submitting you agree to be contacted about this enquiry. We don't share your details with third parties.

✓

Thanks — email sent!

Check your inbox for your calculation results. We'll be in touch soon.

Arrange a free quotation

Please get in touch with any questions you may have or if you wish to arrange a free inspection and quotation.

Head Office: 01329 756935

Covering:

Hampshire, West Sussex
Dorset, Wiltshire
Berkshire, Surrey
London Regions

info@arrowinsulation.co.uk

TrustScore 4.7 | 130 reviews

Excellent

Name

Phone

Email

Address

Choose Service

Message

Services

Cavity Wall Insulation
Cavity Extraction
Loft Insulation
Surveys
Retrofit

Cavity Wall Insulation
Cavity Extraction
Loft Insulation
Surveys
Retrofit

Legal

Terms & Conditions
Privacy Policy
Complaints Procedure
Pre-Start Works Form

Terms & Conditions
Privacy Policy
Complaints Procedure
Pre-Start Works Form

Contact

info@arrowinsulation.co.uk

01329 756935

Facebook Linkedin

Registered Address: Unit 1, 48 Willis Way, Poole BH15 3TB Deliveries to: Unit 3, Concord Park, PO15 5FG
Bennington Commercial Ltd trading as Arrow Energy Solutions. Company No. 09151020 | VAT No. 338868349 Registered in England and Wales