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Just a few quick questions so we can help properly.
- 15-minute call with one of our team.
Proven results in London
Why choose us
We’re here to help you make informed decisions
With installers
Focused on individual products
Installers are experts in what they install, insulation, windows, heat pumps - but advice is often limited to that single measure.
Risk of doing things in the wrong order
Installing one measure too early can reduce effectiveness or create problems later, especially in older homes.
You’re left to join the dots
Homeowners often end up coordinating advice, costs, and decisions themselves.
With Cosy homes
Whole-home advice, not product sales
We look at your home as a system - fabric, ventilation, and heating - so recommendations are based on what your home actually needs.
Right measures, in the right order
Our Retrofit Coordinators create a clear plan that shows what to do now, what can wait, and why.
Supported every step and even after
Powered by the RetrofitWorks network, we help connect you with vetted professionals and oversee the process for peace of mind.
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Years retrofit expertise
Deep understanding of local homes
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Homes transformed
From insulation to heat pumps
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Skilled trades specialists
Ensuring top-quality work
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Homeowners satisfied
With our guidance and care
Our work
Get inspired by our beautiful work
See how we’ve transformed spaces with our expert craftsmanship and attention to detail.
Creating a sustainable home
Nilam transformed her 1960s Paddox estate house to reflect what she truly believes in – adding a heat pump, insulation, and ventilation improvements. Now her home is warmer, greener, and inspiring her neighbours to follow the same path towards sustainable living.
The challenges:
External wall cracks
Poor insulation
Inefficient heating
"I couldn't have asked for more excellent people. So much integrity, very principled, very thorough professionals. It was really reassuring."
Nilam
Cosy Homes Story
When your home finally feels warm
Jane's 1910 Edwardian home had charm but was freezing in places, especially her home office. With insulation, ventilation, and a heat pump, she turned it into a genuinely warm, comfortable space and discovered "A home is so much more than just a place where you live."
The challenges:
Draughty rooms
Poor wall insulation
Single-glazed windows
My study room was freezing cold, but now it's the warmest room in the house.
Jane
Cosy Homes Story
From cold to cosy
This 1930s East Oxford home transformed with insulation, glazing, and ventilation – cutting carbon, lowering bills, and making it warmer year‑round. Eleanor and Chris wrapped their home in expert energy upgrades, turning a draughty terrace into a comfortable space where they can finally feel warm without the thermostat cranked up.
The challenges:
Poor loft insulation
Single-glazed door
Sagging cavity wall insulation
"We've always worried about climate change, but rising energy bills made acting now feel urgent. We truly appreciate the guidance and advice the team provided."
Eleanor & Chris
Cosy Homes Story
You're in safe, experienced hands
We manage the work while you enjoy your improving home
Most homeowners get stuck because they don’t know where to start. We remove the guesswork by providing a clear, expert plan designed specifically for your property.
FAQs
Answering your questions
Got more questions? Send us your enquiry below
1. I’ve heard heat pumps only work in modern, well - insulated homes. Is this true?
No, if done properly, heat pumps can be installed in all sorts of homes, but it’s true that the more energy-efficient your home is, the more efficiently your heat pump will run and the lower your energy bills will be. That’s why we recommend that you install as many insulation and airtightness improvements as your budget will allow before installing a heat pump. You may also need to replace some of your radiators to compensate for the fact that the water circulating in a heat pump system is cooler than from a gas boiler (but still warm enough to heat your home). Our heat pump installer will assess the radiator upgrades required and include these in their final quote.
2. Are you independent, or will you try to sell me a specific product?
We are 100% independent. Unlike a double-glazing salesman or a boiler installer, we aren't trying to shift stock. Our loyalty is to you and your home. We look at the data and recommend what your property actually needs, whether that’s a heat pump, insulation, or simply better ventilation. If an upgrade isn't right for your home, we will tell you.
3. Do I have to do all the work at once?
Not at all. In fact, we often recommend a "staged" approach. Our Whole House Plan gives you a master roadmap for your home. You might choose to do the "quick wins" (like loft insulation) now, and save the bigger jobs (like a heat pump) for a few years down the line. The plan ensures that whatever you do today is compatible with what you do tomorrow.
4. Should I avoid insulating my cavity walls?
No, but you should make sure you use a competent, responsible installer who will do the job right. Most of the issues relate to dampness issues caused by installing cavity wall insulation in the wrong location or with inappropriate materials.
One issue is exposed locations where wind-driven rain hits one side of the house. Our installers will check your location to ensure it is suitable for cavity wall insulation.
Another issue is cavities that are unsuitable for insulation, either because it is too narrow or because it is filled with materials such as mortar and rubble. Our installers will check the cavities in your walls to ensure they are suitable for insulation.
A final issue is inappropriate materials that wick moisture from the outer leaf of the wall, which is exposed to the elements, to the inner leaf, which should remain dry. Our installers will only use appropriate materials.
5. Do problems with solid wall insulation mean it’s a bad idea?
Again, no; but it is important to use a Retrofit Coordinator with experience of working on older homes and installers who know which materials to use and, just as importantly, have a proven track record of installing them.
Some of the issues that have been reported in the retrofit industry: Use of inappropriate insulation systems on traditional solid walls. Solid walls are designed to ‘breathe’ – to allow water vapour to move freely. Problems tend to arise when impermeable materials (e.g., insulation, plaster, render) are used, trapping moisture inside walls.
Poor design or installation of insulation systems. Specific issues can include failure to protect the insulation system from the elements, e.g. allowing rainwater to get into or behind the insulation. Insulation of damp walls. If walls have existing dampness issues, it’s important to fix them at source with an appropriate solution and allow the walls adequate time to dry out before installing insulation. Hiding the problem behind new layers is never a good idea.
Problems caused by inadequate ventilation. Many homes, particularly older ones, have an inadequate ventilation system but are draughty, and these two factors have cancelled each other out. When homes are insulated or made more airtight, this inadequate ventilation can become a problem, leading to issues like high humidity, poor air quality, condensation, mould, health issues like asthma and allergies, and even structural issues like dry or wet rot. This is why it is essential to include a ventilation upgrade when installing energy efficiency measures.
6. What is the vetting process for your trusted contractors and suppliers?
Contractors and suppliers who work on Cosy Homes London projects have to first become members of the RetrofitWorks cooperative. This means they have been vetted through their application process, are members of the national quality assurance schemes TrustMark (www.trustmark.org.uk) and MCS (https://mcscertified.com), and are being supported by the RetrofitWorks team and network.
7. My house is very old / in a conservation area. Can you still help?
Yes. This is actually our specialty. We understand that Victorian terraces and heritage properties need to “breathe” and cannot be treated like modern new-builds. We specify appropriate materials (like wood fibre insulation or lime plaster) and can guide you through planning restrictions to ensure your upgrades improve the home without damaging its character or structure.
8. How do I know your installers are trustworthy?
We know that finding reliable tradespeople is one of the biggest stresses for homeowners. That’s why we do the hard work for you. We have a network of vetted, TrustMark-accredited contractors whom we have worked with on previous projects. We check their insurance, their qualifications, and the quality of their past work so you don’t have to worry about “cowboy builders.”
9. Will these upgrades definitely lower my energy bills?
While every home is different, the primary goal of retrofit is to reduce energy waste. By improving insulation and airtightness, you reduce the amount of heat escaping your home, which typically leads to lower heating demand. During our assessment phase, we can model the estimated savings for your specific property so you can see the potential return on investment before you commit to any construction work.
Ready to take the first step?
Start your journey to a cosier more efficient home
Fill out the quick form below, and a member of our team will get in touch with information on how the service works and the next steps.