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Last updated: 31 January 2025

Cheap Insulation: Affordable Ways to Insulate Your Home

Cheap insulation affordable ways to insulate your home Hero Image
  • Inadequate insulation causes up to 35% of heat to escape from UK homes, driving up energy bills and contributing to a larger carbon footprint.
  • Insulating a typical three-bedroom semi-detached house costs an average of £12,930, which can be unaffordable for many homeowners.
  • Budget-friendly insulation techniques, such as draught-proofing, installing thermal curtains, or insulating pipes, offer cost-effective solutions to minimise heat loss.

Adding insulation to your home effectively reduces energy costs and lowers your carbon footprint, but the upfront expense can be daunting. For example, the cost of installing insulation for a typical three-bedroom house in the UK costs an average of £12,930. With the cost of living expected to hover around £12,000 per year, many households cannot afford to invest in such upgrades.

Yet, according to GOV.UK, nearly £1 of every £3 spent on heating is wasted due to inefficient insulation. This leaves many UK homeowners in a difficult position: wanting to improve energy efficiency and cut high energy bills but struggling to cover the steep insulation costs. Fortunately, there are cheap insulation solutions to this challenge. With ingenuity, careful planning, and research, you can improve your home's insulation without breaking the bank. 

This WhatCost guide will explore various cheap insulation options, including DIY methods and cost-effective materials. From insulating walls and floors to tackling attics, small investments today can lead to substantial energy savings over time.

Looking to insulate your home without emptying your wallet? We understand that comparing quotes can be a headache. WhatCost is here to help! Fill out our quick 30-second form and receive up to four free quotes from reliable insulation specialists. Save time, get the best deal, and enhance your home's energy efficiency today. Click below to learn more!

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Ways to insulate your house cheaply

By improving your house insulation, you can save up to £630 to £730 annually on your energy bills, depending on the area you are insulating and your property type. Using several cheap insulation methods, you can save on your energy bills without breaking the bank. Here are the cheapest insulation methods you can do:

Window insulation

Different types of window insulation

Insulating your windows with cheap insulation methods can reduce heat loss in your home by up to 10%. Here are some effective and budget-friendly options to improve your window insulation:

  • Window films: Depending on the manufacturer, window films cost between £15 and £50 per m2. They are transparent sheets that reflect heat into your room without blocking natural light. They are an easy and affordable way to enhance energy efficiency.
  • Thermal curtains: Thermal curtains are another excellent cheap insulation method, averaging around £50 per m2. Made from thick, insulated fabrics, they help retain warmth in winter and block excess heat during summer, ensuring comfort year-round.
  • Secondary glazing: This budget-friendly solution involves adding an extra glass or acrylic pane inside a single-glazed window. The insulating air layer reduces heat loss and improves efficiency without replacing the original window. Costs typically range from £250 to £500 per window, making it a cheaper alternative to full double glazing.

By using these cheap insulation techniques, you can make your home more energy-efficient while keeping costs low.

Hot water tank insulation

Benefits of hot water tank insulation

Hot water tank insulation is one of the easiest and most effective ways to reduce heat loss and one of the most affordable cheap insulation methods. By fitting an insulating jacket, typically made from materials like fibreglass, foam, or reflective foil, you can cut standby heat loss by 25% to 45%.

This simple upgrade can lead to annual savings of up to £35 in Great Britain and £45 in Northern Ireland. Insulating jackets are widely considered a cheap insulation solution, with costs ranging from £18 to £30, depending on your location and the material you choose.

Investing in this small, budget-friendly upgrade can improve your energy efficiency and allow you to see noticeable savings over time.

Radiator insulation

Benefits of radiator insulation

Around 40% of the heat from your radiators can escape through uninsulated walls. While adding insulation on walls is one of the most effective ways to enhance thermal efficiency, radiator insulation is a great cheap insulation solution to help reduce heat loss and save energy costs.

Using reflective foil behind your radiators helps to reflect heat into your room, reducing the amount absorbed by external walls. This cheap insulation method is easy to install and typically costs between £12 and £33, depending on the size and thickness of the foil. It's affordable to boost your home's energy efficiency with minimal effort.

Pipe insulation 

Benefits of pipe insulation

Adding insulation to the pipes in your home is a practical and cheap insulation method to improve energy efficiency—a perfect example of how to insulate a house cheaply. This simple upgrade helps retain heat in hot water pipes, reduces energy loss, and prevents pipes from freezing during colder months while being budget-friendly. There are two popular methods for pipe insulation:

  • Foam insulation: The most common pipe insulation type is closed-cell polyethene foam or rubber. It’s easy to cut and install, making it a convenient choice for hot and cold pipes while providing excellent thermal protection.
  • Foil insulation: Also known as reflective foil, this material wraps around pipes to reflect heat, making it particularly effective for hot water pipes. Lightweight and moisture-resistant, it’s suitable for various environments and easy to install.

Pipe insulation is a cheap insulation method, with costs ranging from £6 to £35 per m2, depending on the material. Insulating your pipes can reduce heat loss by up to 12%, saving energy and lowering your heating bills.

Draught-proofing

Different ways to draught proof a home

Draught-proofing is a simple, effective, and affordable way to improve your home's insulation and reduce energy loss. According to the Energy Saving Trust, with an average cost of around £180 for full draught-proofing, this cheap insulation method can save you between £35 and £50 per year on heating bills.

Here are the key areas to focus on when learning how to insulate a house cheaply:

  • Windows: Apply adhesive foam, metal, or plastic strips around window frames to stop air leaks and improve thermal efficiency.
  • Doors: Like windows, block draughts using keyhole covers, letterbox brushes, and strips around the edges.
  • Chimneys: Fit a chimney draught excluder or cap to prevent heat loss, saving £50-£70 annually.
  • Floorboards and skirting boards: Seal gaps with caulk or flexible fillers to block draughts and retain warmth.
  • Loft hatches: To minimise heat loss, add strip insulation around the edges of loft hatches, similar to insulating doors and windows.
  • Pipes: Seal gaps around pipes with silicone or other fillers to stop warm air from escaping.
  • Wall cracks: Fill cracks in old walls with cement or rigid fillers to block draughts effectively.

These cheap insulation techniques can make your home warmer, more energy-efficient, and cost-effective to heat—all while staying within a budget.

Carpet underlay

benefits of carpet underlay

Adding carpet underlay to your floors effectively reduces heat loss by up to 15%. This is one of the cheapest insulation methods available, offering improved thermal efficiency, enhanced comfort, and protection for your floorboards against moisture.

With costs ranging between £3 and £8 per m2, carpet underlay is a budget-friendly solution for DIY enthusiasts. Using basic tools, you can install it yourself, avoiding professional fees and keeping costs even lower. If you’re searching for the cheapest insulation options to enhance your home, carpet underlay is an excellent choice.

Smart thermostat 

Benefits of using a smart thermostat

A smart thermostat is an excellent complement to cheap insulation methods for boosting your home’s energy efficiency. While it doesn’t directly insulate, it maximises the effectiveness of your existing insulation by optimising how you heat and cool your home, leading to better energy management and lower heating costs.

With a smart thermostat, you can control temperatures in specific areas, using energy only when and where needed. This reduces unnecessary heat loss and minimises overuse of your heating system, enhancing the impact of your insulation.

A smart thermostat, costing between £120 and £220, may seem like an investment, but it quickly pays off through long-term energy savings. It’s an innovative and cost-effective choice for any homeowner when combined with cheap insulation upgrades.

DIY insulation

Benefits of DIY insulation

Opting for DIY methods when insulating your home can eliminate the substantial costs of labour, which can average around £250 per person per day, depending on your location. Labour typically accounts for approximately 60% of the total cost of insulation installation. By doing it yourself, you can significantly lower the overall expenses, making it a viable option for achieving cheap insulation.

DIY projects also provide greater control over the process, offering a practical and cost-effective way to improve your home’s energy efficiency. However, it’s essential to acknowledge that not all insulation tasks are suitable for DIY. For instance, insulating a loft or other challenging areas may require specialised equipment and professional expertise to ensure proper installation.

While DIY insulation can save on labour costs upfront, improper installation may lead to issues such as condensation or thermal bridging, which can cause expensive repairs in the long run. Additionally, taking on the entire project yourself may disqualify you from grants or financial incentives, often stipulating that certified professionals must carry out the work.

To strike a balance, consider focusing your DIY efforts on simpler, cost-effective tasks like draught-proofing or installing thermal curtains. These straightforward solutions are affordable and contribute to cheap insulation, reducing energy costs while preserving access to grants for more complex work.

Identify heat loss areas in your house

Heat loss in different areas of the home

Recognising where your home is losing heat is essential to improving energy efficiency. Targeting specific areas like windows, doors, and pipes can yield quick and affordable savings. Still, more extensive measures, such as insulating walls, lofts, and floors, deliver substantial long-term benefits. Here’s a breakdown of the key areas where you can achieve the most significant energy savings:

  • Loft insulation: Installing loft insulation, which costs approximately £930, can reduce heat loss by as much as 25%. By choosing to insulate your loft, you could save up to £225 annually on energy bills. With these savings, the investment typically pays itself in under two years.
  • Windows and doors: Addressing draughts with inexpensive solutions like weatherstripping or window film can reduce heat loss by up to 10%. These quick fixes are cost-effective and easy to implement.
  • Wall insulation: Uninsulated walls can cause up to 35% of a home’s heat loss. Upgrading to cavity or solid wall insulation, though initially more expensive than draught-proofing, can save you as much as £700 annually. This option not only improves comfort but also provides significant long-term energy savings.
  • Floor insulation: While adding carpet underlay or sealing gaps in floorboards can help retain heat, installing proper floor insulation is a more effective solution. It minimizes heat escape through the ground and ensures lasting energy efficiency.

Although quick fixes like draught-proofing or radiator reflectors offer immediate, low-cost savings, they are only temporary solutions. Comprehensive insulation for lofts, walls, and floors provides more significant energy conservation and financial returns. For instance, loft insulation alone significantly reduces heat loss, offering one of the quickest and most cost-effective ways to enhance your home’s energy efficiency.

Grants

Grants for insulations

Accessing insulation grants is an excellent way to secure cheap insulation, reduce upfront costs, and improve your home's energy efficiency. Several schemes across the UK provide financial support, making insulation upgrades more affordable for households.

  • ECO4 Scheme: Funded by energy companies, this scheme supports low-income or vulnerable households. Eligibility depends on income, benefits, and property energy efficiency ratings. ECO4 can fully or partially cover the cost of external wall insulation, significantly reducing expenses for qualifying households.
  • The Great British Insulation Scheme: This program offers free or discounted insulation to homeowners, landlords, and tenants in England, Scotland, and Wales. Properties must have an EPC rating of D to G or fall within certain Council Tax bands (A in England, A in Scotland and Wales). Tenants must obtain landlord permission to apply.
  • Warmer Homes Scotland Scheme: This program provides financial support for attic and wall insulation, draught-proofing, and heating upgrades. It targets groups like residents aged 75 or older without central heating, terminally ill individuals, and those receiving specific benefits. Eligibility includes meeting energy efficiency criteria.
  • Northern Ireland Affordable Warmth Scheme: Aimed at low-income homeowners and renters, this Northern Ireland grant scheme helps with energy-saving measures like solid wall insulation. To qualify, applicants must earn £23,000 or less annually.
  • Warm House Plan: In 2025, this scheme offers up to £15,000 for energy efficiency improvements and an additional £15,000 for low-carbon heating systems. It’s expected to run for 3 to 5 years.

These grants contribute to cheap insulation, significantly saving energy bills while reducing carbon emissions. Check eligibility criteria to see which scheme can help you achieve cost-effective insulation.

Partnering with an insulation specialist is crucial to secure these valuable grants. While finding one can be daunting, WhatCost simplifies the process for you. By filling out our 30-second form, we'll connect you with up to four free quotes—completely transparent, with no hidden costs or obligations. Click below to learn more!

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Cheap insulation materials

cheap insulation materials, fibreglass, EPS boards, Cellulose

When exploring cheap insulating materials, balancing cost and effectiveness is essential. While budget-friendly options may not always match the performance of premium materials, many still provide excellent value. Here are the cheapest insulation materials to help improve energy efficiency without exceeding your budget:

  • Fibreglass: Fibreglass is one of the cheapest insulation options available, costing about £10 per m2 with an R-value of 3 to 4 per inch for decent thermal performance. While it does not absorb water, it can retain moisture, reducing its effectiveness and promoting mould growth. It is best used in dry areas. On the plus side, fibreglass is fire-resistant up to 540°C and effective for soundproofing, making it a reliable choice for affordable insulation.
  • EPS boards: Expanded polystyrene boards are a cheap insulation option, priced at around £10 per m2. With an R-value of 4 to 4.5, EPS provides good thermal resistance and is available in various thicknesses that can be cut to fit specific dimensions. However, it is not fire-resistant and needs an additional fire-resistant layer for safety. Despite this, its low cost and ease of installation make EPS a popular choice for rigid insulation.
  • Cellulose: Cellulose insulation costs around £11 per m2 and is a sustainable, cost-effective option made from fire-retardant-treated recycled paper. With an R-value of 3.1 to 3.8 per inch, it effectively fills gaps in hard-to-reach areas, helping to lower energy bills. However, it can absorb moisture, potentially causing sagging or damage, so a vapour barrier is recommended, which may add to the cost.

Partner with experienced installers to ensure you choose the right materials and methods for outstanding results. They will assist you in finding cost-effective solutions that perfectly fit your needs and budget. At WhatCost, we specialise in connecting you with the finest insulation experts in your region. Fill out our brief 30-second form, and you'll receive up to four free, no-obligation quotes. Don't let time slip away—click below to discover more!

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