Historical Context and Manufacturing Details

The Douglas Special house, a unique and historically significant property type, was designed by A H Mottram and constructed in 1944. This period marked a time of innovation and necessity in the UK housing market, driven by the aftermath of World War II. The Douglas Special was one of many system-built properties developed to address the urgent need for housing. Only 64 of these properties were built, making them a rare find in today’s market.

These homes are typically found in semi-detached bungalow and chalet bungalow forms. The bungalows feature a medium pitch hipped roof, while the chalet bungalows have a medium pitch gable roof. Both types are covered in concrete tiles, a common roofing material of the era. The external walls of these homes are distinct, with vertical timber boarding for bungalows and horizontal timber boarding for chalet bungalows. A timber porch often complements the entrance, adding to the rustic charm of these properties.

Manufacturers and Design Characteristics

The Douglas Special houses were manufactured by a collaboration of builders and designers, with A H Mottram playing a pivotal role in their design. These homes were part of a broader movement towards prefabricated and system-built housing, which aimed to provide quick and affordable housing solutions during a time of significant demand.

Identification Characteristics

To identify a Douglas Special house, look for the following features:
– Semi-detached bungalows and chalet bungalows: These are the primary forms in which these houses were built.
– Roof design: Bungalows have a medium pitch hipped roof, while chalet bungalows feature a medium pitch gable roof, both covered in concrete tiles.
– External walls: Bungalows have vertical timber boarding, whereas chalet bungalows have horizontal timber boarding.
– Timber porch: A common feature at the entrance of these homes.

Construction Details

Understanding the construction details of the Douglas Special house is crucial for potential buyers and investors. These homes were built with specific materials and techniques that reflect the era’s construction practices.

Substructure

The substructure of the Douglas Special house consists of brick on concrete strip footing. This foundation type was common in the mid-20th century and provides a stable base for the timber-framed structure above.

External Walls

The external walls are constructed with 2-inch solid timber planking, lined internally with fibreboard and externally sheathed with building paper. The bungalows feature diagonal timber boarding and vertical timber boarding, while the chalet bungalows have horizontal timber boarding. This combination of materials provides both structural integrity and insulation.

Separating Wall and Partitions

The details of the separating wall are not well-documented, but the internal partitions are made of timber stud. This lightweight construction method allows for easy modification and repair.

Floors

The ground floor construction details are not known, but the first floor is built with timber joists. This is typical of the period and provides a sturdy yet flexible flooring system.

Ceilings and Roof

The ceilings’ construction details are not specified, but the roof is made of timber rafters and purlins, covered with concrete tiles. This roofing system is durable and provides good weather resistance.

Typical Hazards and Risks

When considering the purchase of a Douglas Special house, it’s essential to be aware of the typical hazards and risks associated with this property type. These homes, like many system-built houses from the mid-20th century, can have specific issues that need careful inspection and maintenance.

Timber Decay

One of the primary concerns with the Douglas Special house is timber decay. The timber framing and boarding used in these homes are susceptible to rot and insect infestation, especially if the property has not been well-maintained. Regular inspections and prompt repairs are crucial to prevent extensive damage.

Insulation and Energy Efficiency

The insulation in these homes may not meet modern standards, leading to higher energy costs and potential comfort issues. Upgrading the insulation and improving the overall energy efficiency of the property can be a worthwhile investment.

Structural Integrity

The structural integrity of the timber frame can be compromised over time due to various factors, including moisture ingress and general wear and tear. A thorough structural survey is essential to identify any weaknesses and plan for necessary repairs.

Asbestos

As with many older properties, there is a risk of asbestos being present in the Douglas Special house. Asbestos was commonly used in building materials during the mid-20th century, and its presence can pose serious health risks. Professional asbestos surveys and removal are necessary if asbestos is found.

Defective Premises Act Considerations

The Douglas Special house is not specifically classed as defective under the Defective Premises Act. However, this does not mean that these properties are free from issues. The Act requires that properties be fit for habitation and free from significant defects. Therefore, any potential buyer or investor should conduct a thorough survey to ensure the property meets these standards.

Inspection Guide for Surveyors

For surveyors inspecting a Douglas Special house, several key areas require close attention. The following guide provides a step-by-step approach to assessing these properties.

External Inspection

1. Roof: Check the condition of the concrete tiles and the timber rafters and purlins. Look for signs of damage, wear, or leaks.
2. Walls: Inspect the vertical or horizontal timber boarding for signs of rot, decay, or insect infestation. Pay particular attention to areas where the timber meets the ground or is exposed to moisture.
3. Porch: Examine the timber porch for structural integrity and signs of decay.

Internal Inspection

1. Substructure: Although not visible, check for signs of subsidence or movement in the brick on concrete strip footing.
2. Walls and Partitions: Inspect the internal timber stud partitions for stability and signs of damage.
3. Floors: Assess the condition of the timber joists on the first floor. Look for any signs of sagging or weakness.
4. Ceilings: While the construction details are not specified, check for any signs of water damage or structural issues.

Additional Considerations

1. Insulation: Evaluate the insulation levels and consider recommending upgrades to improve energy efficiency.
2. Asbestos: Conduct an asbestos survey if there is any suspicion of its presence in the property.
3. Timber Decay: Use moisture meters and other tools to assess the extent of any timber decay and recommend appropriate treatments.

Typical Defects and Maintenance Tips

Understanding the typical defects associated with the Douglas Special house can help buyers and investors plan for maintenance and repairs. Here are some common issues and tips for addressing them.

Timber Decay

Regularly inspect the timber framing and boarding for signs of rot and decay. Treat any affected areas promptly with appropriate preservatives and consider replacing severely damaged timber.

Insulation

Upgrade the insulation in the walls, roof, and floors to improve energy efficiency and reduce heating costs. Modern insulation materials can provide better performance and comfort.

Structural Repairs

Address any structural issues identified during the survey. This may include reinforcing or replacing weakened timber elements and ensuring the overall stability of the property.

Asbestos Management

If asbestos is found, hire a professional to safely remove and dispose of it. Do not attempt to handle asbestos yourself, as it can pose serious health risks.

Conclusion

The Douglas Special house is a unique and historically significant property type that offers both charm and challenges. Understanding the construction details, typical hazards, and maintenance requirements is essential for anyone considering purchasing or investing in one of these homes. By conducting thorough inspections and addressing any issues promptly, you can ensure that your Douglas Special house remains a safe and comfortable place to live.

At Flettons, we’re committed to safeguarding your investment. When considering a property purchase, trust our seasoned expertise to reveal any hidden threats. For a thorough building survey, get your instant quote through our quote calculator or reach out directly at 0203 691 0451. Your home’s safety is our top priority.