Take the guesswork out of measuring your property with our free Bay Window Calculator. Whether you have a typical trapezoidal bay or a round window, our interactive tool instantly calculates the exact floor area and window perimeter in meters. Perfect for domestic and non-domestic energy assessors. Export your results directly to PDF or JPEG!
Why Is My New EPC Worse Than My Old One? Understanding the Shift to RdSAP 10
Has your property’s energy rating taken an unexpected dip? Many homeowners are finding that their brand new EPC is lower than the one from a decade ago, even after making improvements. From the major transition to the RdSAP 10 framework to the new way we measure windows and heating efficiency, the rules of the game have changed. Read our latest article to understand why the goalposts have moved and, most importantly, how you can prepare the right evidence to protect your property’s score during its next assessment.
SAP vs RdSAP: What’s the Difference and Which One Do You Need?
Learn the difference between SAP and RdSAP EPCs, when each applies, and how Harpr Surveyors can help – locally in Cornwall and nationally across the UK.
Landlord Energy Audit Reports: A Practical Guide for Domestic Properties
Comply with the current and upcoming energy regulations through Landlord Energy Audit Reports! They include EPC analysis, property modelling and advice on how to ensure your rental meets the required standards.
Average Ceiling Height Calculator: a tool for Energy Assessors
We’ve developed an average ceiling height calculator for EPC assessors, Retrofit professionals and anyone else that would require the calculation. You can also download a calculation overview in PDF format for audit evidence.
Do Listed Buildings Need an EPC? A Guide for Property Owners
Did you know that over 60% of listed buildings in England and Wales fall below an E rating on their Energy Performance Certificate (EPC)? According to Historic England, this stark figure highlights the tension between conservation rules and energy efficiency...
EPC graph maker – Our Free Online Generator
Developed for estate agents, landlords and property professionals where an EPC graph is required. Create a clean graphic that can be displayed on sales particulars, online portals or simply email. No sign up or email required, just the Current and Potential score needed!
Understanding Energy Performance Certificates (EPCs): A Guide for UK Property Owners
If you're buying, selling, or renting a property in the UK, you'll encounter the term Energy Performance Certificate (EPC). But what exactly is it, and why does it matter? Let's break it down. What is an EPC? An EPC assesses a property's energy efficiency, rating it...
Holiday Lets and Park Homes, Do I Need an EPC? A Practical Guide for Property Owners
Whether you own a cozy countryside holiday cottage in Cornwall or a park home nestled in a quiet retreat in Kent, understanding Energy Performance Certificates (EPCs) can be tricky. Do you need one? When? And what actually counts as a "building" when it comes to EPC...
How to Prepare for an EPC Assessment: A Complete Guide for Homeowners and Landlords
Energy Performance Certificates (EPCs) are essential for anyone selling, letting, or improving a property in the UK - there are some exceptions. They provide a snapshot of your building’s energy efficiency, rated from A (most efficient) to G (least efficient), and...









