One of the most common questions asked by homeowners, landlords and property investors is: “How much does it cost to improve an EPC rating?”

The answer depends on the property, its construction, existing energy efficiency measures and the improvements being considered. There is no universal cost because every building is different.

Before investing in upgrades, it is important to understand that EPC assessments consider multiple factors and no improvement can guarantee a specific EPC rating or compliance outcome.

Founded in 2015 by Jino Jose, EPCRATE provides EPC assessments and Draft EPC reviews throughout London, helping property owners make informed decisions before committing significant expenditure. Call 020 3488 4142 to speak with our team.

Why EPC Improvement Costs Vary

The cost of improving a property’s energy performance can vary significantly depending on:

  • Property size.
  • Property age.
  • Construction type.
  • Current energy performance.
  • Existing heating systems.
  • Available supporting evidence.
  • The scope of planned works.

A modern apartment and a Victorian terrace may require very different approaches.

Common EPC Improvement Measures

Loft Insulation

Loft insulation is often considered one of the more straightforward energy efficiency improvements where appropriate.

Costs can vary depending on:

  • Property size.
  • Accessibility.
  • Existing insulation levels.
  • Installation requirements.

Heating System Upgrades

Heating systems often play an important role in overall energy performance.

Potential costs vary significantly depending on:

  • System type.
  • Property layout.
  • Installation complexity.
  • Associated controls and upgrades.

Heating Controls

Programmable controls, thermostats and zoning systems may form part of wider energy efficiency improvements.

Costs vary depending on the existing installation and system requirements.

Window Replacement

Glazing improvements can represent a significant investment.

Property owners should always retain supporting documentation such as FENSA certificates where applicable.

Renewable Technologies

Some property owners consider technologies such as:

  • Solar panels.
  • Air source heat pumps.
  • Solar thermal systems.

Installation costs vary considerably depending on the property and chosen technology.

The Hidden Cost of Making the Wrong Improvements

One of the biggest risks for property owners is investing in measures without fully understanding how those improvements fit within the property’s overall energy profile.

Many landlords spend substantial sums on upgrades without first reviewing:

  • The property’s current EPC position.
  • Available supporting evidence.
  • Alternative improvement options.
  • Property-specific limitations.

In some cases, the cost of unnecessary works can far exceed the cost of obtaining professional guidance before proceeding. Our guide on improving EPC ratings without overspending covers this in more detail.

Why Supporting Evidence Matters

Supporting evidence can be just as important as the improvement itself.

Useful documentation may include:

  • Insulation certificates.
  • FENSA certificates.
  • Building Control approvals.
  • Completion certificate.
  • MCS certificates for renewable technologies.

Suitable evidence may help ensure qualifying features are appropriately reflected where assessment methodologies and conventions allow. See our full guide to EPC evidence and documents.

Why Consider a Draft EPC Before Spending Money?

Many property owners seek a Draft EPC review before investing in major improvements.

A Draft EPC can help:

  • Review the property’s current position.
  • Explore potential improvement scenarios.
  • Identify supporting evidence requirements.
  • Compare possible investment options.
  • Support budgeting decisions.

For example, a landlord considering £10,000–£20,000 of refurbishment works may wish to understand how different measures fit within the property’s overall energy profile before committing expenditure.

A Draft EPC can support this planning process.

However, a Draft EPC does not guarantee a particular EPC rating, compliance outcome or improvement result.

Final EPC ratings depend on the property’s characteristics, supporting evidence, assessment methodology and information available at the time of the official assessment.

EPC Improvement Costs for London Flats

Many London landlords own flats and apartments where improvement options may be influenced by:

  • Leasehold arrangements.
  • Building management companies.
  • Communal heating systems.
  • Shared building structures.

This is why property-specific planning is often more useful than generic cost estimates.

Investment Planning for Landlords

Landlords often need to balance:

  • Property compliance.
  • Tenant expectations.
  • Long-term asset performance.
  • Refurbishment budgets.
  • Future property value considerations.

Understanding available options before spending money can help support more informed investment decisions.

Why Choose EPCRATE?

  • Founded in 2015 by Jino Jose.
  • DEA Accredited.
  • ★★★★★ Trustpilot Reviews.
  • ★★★★★ Google Reviews.
  • Coverage across all 32 London boroughs.
  • Only London provider offering a Draft EPC service.
  • Domestic and Commercial EPC specialists.
  • Greater London Energy Efficiency Awards – Commended 2024.
  • Greater London Energy Efficiency Awards – Highly Commended 2025.
  • Same-day appointments available where possible.

Frequently Asked Questions

How much does it cost to improve an EPC rating?

Costs vary depending on the property, existing systems and improvements being considered. There is no universal figure. Call EPCRATE on 020 3488 4142 for property-specific advice.

Can expensive improvements guarantee a better EPC rating?

No. EPC outcomes depend on multiple factors and no improvement can guarantee a specific rating.

Why should I keep supporting documentation?

Suitable evidence may help ensure qualifying features are appropriately reflected during future assessments where assessment conventions allow.

Should landlords consider a Draft EPC before refurbishment works?

Many landlords find Draft EPC reviews useful when planning energy efficiency improvements and refurbishment projects. EPCRATE is the only London provider offering this service.

Can a Draft EPC guarantee compliance?

No. A Draft EPC is a planning and decision-support tool and cannot guarantee any particular outcome.

Budgeting for energy efficiency improvements? Call EPCRATE on 020 3488 4142 to arrange a Draft EPC review before committing your budget.

Service Price
1 Bedroom EPC £59
2 Bedroom EPC £69
3 Bedroom EPC £79
EPC + Floor Plan Bundle £118



Written by Jino Jose

DEA & NDEA Accredited Energy Assessor  ·  EPCRATE, London  ·  Founded 2015

Jino Jose is the founder of EPCRATE and one of the few London assessors holding both Domestic Energy Assessor (DEA) and Non-Domestic Energy Assessor (NDEA) accreditations. He has carried out thousands of EPC assessments across all 32 London boroughs since 2015.

✓ DEA Accredited ✓ NDEA Accredited ⭐ Trustpilot 5.0

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