Insulating a Loft Conversion
- Catherine Allen
- Feb 19
- 3 min read
Updated: Mar 17
Why Insulation Matters in a Loft Conversion
When converting your loft insulation is one of the most important elements to get right. A well-insulated loft conversion ensures energy efficiency, helps maintain a comfortable temperature year-round and reduces heating costs. At The Loft Build Company we ensure that all our loft conversions meet or exceed current insulation regulations, keeping your home warm in the winter and cool in the summer.
The Loft Build Company’s Standard Insulation Approach
We prioritise high-performance insulation materials to ensure maximum energy efficiency and comfort. Our standard approach includes:
Roof Insulation:
We use high-quality rigid insulation boards like Kingspan or Celotex between and over the rafters. This helps to achieve a high level of thermal performance without taking up too much space.
Wall Insulation:
For external walls we use insulated plasterboard or multi-layer foil insulation to prevent heat loss.
Floor Insulation:
The floor of the loft conversion is insulated using mineral wool or rigid foam insulation, providing both thermal efficiency and soundproofing benefits.
Windows and Ventilation:
Double or triple-glazed windows and strategically placed ventilation ensure adequate airflow while retaining heat.
Insulation Choices for Homeowners
While we install high-quality insulation as standard, homeowners have several options depending on their preferences, budget and specific needs. Here are some of the choices available:
Spray Foam Insulation
Provides excellent airtightness and high thermal efficiency.
Ideal for hard-to-reach spaces and complex loft structures.
More expensive than other options but offers long-term energy savings.
Rigid Foam Board Insulation
Commonly used in roof and wall insulation.
Provides high thermal performance with minimal thickness.
Works well with modern loft conversions aiming for maximum space.
Mineral Wool Insulation
A cost-effective solution with good thermal and acoustic insulation properties.
Easy to install between rafters and floors.
Requires a vapour control layer to prevent condensation issues.
Multi-layer Reflective Foil Insulation
A thinner alternative to traditional insulation methods.
Provides effective thermal performance and radiant heat reflection.
Best used in combination with other insulation materials.
Building Regulations for Loft Insulation
At The Loft Build Company, we ensure all our loft conversions comply with or exceed regulations providing long-term energy savings and reducing environmental impact. Learn more about loft conversion building regulations here.
The Cost of Insulating a Loft Conversion
The cost of insulation depends on the size of the loft, the materials used and any additional soundproofing requirements. As a general guide:
Rigid foam board insulation: £20-£50 per square meter.
Mineral wool insulation: £10-£30 per square meter.
Spray foam insulation: £40-£70 per square meter.
While spray foam insulation is the most expensive option, it provides superior airtightness and energy efficiency which can reduce heating costs over time.
Proper insulation is key to a successful loft conversion. Not only does it improve comfort and energy efficiency but it also ensures compliance with building regulations. At The Loft Build Company we use only the best insulation materials and techniques to create high-quality loft conversions that stand the test of time. Learn more about how much a loft conversion costs here.
Need Expert Advice?
Interested in learning more about the different types of loft conversions available?
We have dedicated pages covering each option in detail.
Whether you're considering a dormer, mansard, hip-to-gable or Velux conversion, you’ll find everything you need to know about costs, planning permissions and design possibilities. Start here.
FAQ's about Loft Conversions
We've prepared several guides for the most common questions we are asked when it comes to loft conversions. Read them here:
Let's Chat!
If you have any questions about loft conversion building regulations or need expert advice get in touch with our team. We’re here to guide you through every step and help you elevate your living space.
0208 129 0976
