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All of Lissett’s homes adhere to the following as a minimum.

Weight of a home - A typical home weighs at least 20 tonnes.

Insulation in the homes - 90mm Kingspan to walls, 150mm Isowool to the floors and 300mm Isowool to the ceilings.

BS3632 - This is the residential standard for park homes and lodges which Lissett comfortably exceed.

All mattresses supplied in a LIssett Home are 3,000 pocket sprung.

What is a U Value? (Unit W/m²k)

A U value is the rate of heat transfer per square metre of a structure i.e. the wall, roof or floor. The lower this figure is the better as this means there is less heat transfer. The U value is calculated by evaluating the insulation effect of the component parts of the building's structure.

What is air permeability? (Unit is m³/hm² (@50Pa))

The air permeability of a building measures the build quality of the envelope. Air permeability means uncontrolled air leakage through cracks and fissures (even microscopic cracks will leak air) in walls and roof. An air permeability test, is a standard test at 50 PA of pressure whilst considering the overall volume of the building and metres squared. A high air permeability indicates high loss of heat through air leakage, as a consequence within building regulations there is a minimum air leakage figure allowed.

All this translates into Lissett Homes selecting the best available materials and appliances to heat our homes and a building built to the highest quality standards. As a minimum we offer the following specification:

Lissett Standard W/m²k BS3632 Standard W/m²k Current BuildingRegulations Minimum W/m²k
Floors 0.29 0.35 0.25
Walls 0.30 0.35 0.30
Roof 0.12 0.20 0.20
Doors & Windows 1.2 (A Rated) 1.6 0.16 (C Rated)
Boiler A Band Not Specified Band B
Air permeability <3 m³/hm² (@50Pa) Not Specified <10 m³/hm² (@50Pa)

Roof Construction

Our roof is constructed using trussed rafters to various designs to enable both flat ceiling roofs and vaulted (or cathedral type) roofs. The rafters have been certified by structural engineers and they are manufactured on site to tight quality standards.

The strength of the overall building comes from the strong tying between the roof, walls and floor. Our structure is all tied together using fixings, glue and cross-bonding with structural external plywood.

This results in an immensely strong structure capable of withstanding huge shear, strain and loads. It is with experience of building and transporting exceptionally large park homes and holiday lodges that we have understood the importance of an integrated structure. The difference to other manufacturers is we are able to consistently build the biggest park homes and holiday lodges in the industry. We are well respected by our long standing clients, who know they can rely of Lissett build quality.


We design using 3 dimensional software to enable every detail to be scrutinised, ensuring the best use of available space within the construction. The advantage this offers is complete freedom and confidence in our design of bespoke homes, allowing you to experience this home whilst walking through it in a computer simulated model.


Our construction starts with a robust hot rolled steel chassis, consisting of two large steel "C-sections" beams with high tensile strengthening beams. Our chassis are heavier than most manufacturers because our construction is heavier and more robust. Our chassis is manufactured in compliance to CP501 as required by the BS3636 (The British Standard for Residential Park Homes). Our chassis will last a lifetime and beyond.


Our floors are constructed using quality structural top class timber joists, vac/vac treated against fungicides and insects. It is integrated with the chassis, through tying every joist twice with mechanical bolts. Every timber is inspected prior to use and any timber not meeting strict quality inspection standards for straightness/knots is rejected. We integrate our joists in this way because it ensures the chassis behaves as one with the structure; creating an extremely strong foundation on which to build.

Precision Engineering

We are guided by lasers to ensure our construction is built to the tightest of tolerances. Constructing in modular requires skill, experience and accuracy. Lasers help this process and enable us to check and consistently measure more.

The result is a construction built far more precisely than any modern house builder.

Our Construction in Summary

Our construction is comparatively heavier than most of our competitors because our chassis is more substantial, we use more timber, our timber is often higher grade and denser and we use more insulation. Our construction is precision engineered and tied together to make the strongest and best insulated construction possible. The result is a construction which is built to a much higher quality than most other manufacturers and one which is built to last.

Still need more information please? Then please don’t hesitate to contact us and we can go through our construction in even more detail.

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