5 ways to insulate your home without altering the facade

Improving the insulation of your home can significantly reduce your energy bills and increase comfort levels. However, for those living in buildings with historical or architectural significance, external alterations like facade insulation are often not an option. This brings about a unique challenge: how to enhance energy efficiency without compromising the building’s external character. Fortunately, there are several effective strategies to insulate your home from the inside, preserving both its aesthetic and structural integrity.
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The importance of interior insulation

In regions such as Brussels, where the architectural heritage is rich and diverse, the challenge of improving energy efficiency while preserving historic facades is particularly acute. The local government encourages renovations to meet ambitious energy performance targets, aiming for a significant reduction in the energy consumption of buildings by 2050. However, this goal must be balanced with the need to protect the architectural heritage, making internal insulation solutions not just preferable but necessary for many homeowners.

Challenges and considerations

Internal insulation involves adding insulating materials to the inside of external walls, floors, or roofs, which can be complex and requires careful planning. One major consideration is the risk of moisture accumulation, which can lead to dampness and mold growth if not properly managed. Additionally, internal insulation can slightly reduce the usable interior space, a trade-off that homeowners need to consider.

Innovative solutions for internal insulation

1. Insulating interior walls: This method involves adding a layer of insulation material to the inner surface of external walls, followed by a new wall finish. It’s essential to choose materials that offer high insulation values without taking up too much space. 2. Roof and loft insulation: Insulating the underside of the roof or the loft space can be an effective way to prevent heat loss, especially in houses where the attic is not used as living space. This method can significantly improve thermal efficiency with minimal impact on the living areas below. 3. Underfloor insulation: Insulating beneath floorboards on the ground floor or above unheated spaces like basements can reduce heat loss through the floor, enhancing overall comfort and energy efficiency. 4. Party wall insulation: Insulating party walls, the walls shared with neighboring properties, can reduce heat transfer between homes in terraced or semi-detached buildings, improving thermal efficiency and possibly sound insulation. 5. Secondary glazing: For historic properties where changing the external windows is not an option, secondary glazing can be an effective alternative. It involves installing an additional pane of glass or clear acrylic inside existing windows, reducing heat loss and improving sound insulation without affecting the building’s exterior appearance.

Professional advice and assistance

Tackling internal insulation in historic or architecturally significant buildings requires a nuanced approach, taking into account both the technical aspects of insulation and the need to preserve the building’s character. Organizations like Homegrade offer specialized advice and support for homeowners navigating these challenges, ensuring that renovation projects are both effective and respectful of the building’s heritage.


Insulating a home without altering its facade is a viable and increasingly necessary approach for many homeowners, especially in areas with a rich architectural heritage. By exploring innovative internal insulation methods and seeking expert guidance, it’s possible to enhance your home’s energy efficiency while preserving its historic character. This not only contributes to environmental sustainability goals but also ensures the longevity and comfort of these unique properties for future generations.