Overview of the Parkinson House

The Parkinson House, a notable example of system-built properties in the UK, was manufactured by J Parkinson & Sons Ltd. These properties, often referred to as “Blackpool” houses, were constructed during a specific period and have unique characteristics that set them apart from other housing types. Understanding these features is crucial for potential buyers and investors, as it helps in making informed decisions regarding property purchases.

Historical Context and Manufacturing Details

Period Built and Typical Locations

The Parkinson House was predominantly built in the mid-20th century, a time when the UK faced a significant housing shortage. This period saw a surge in the construction of system-built properties, which were designed to be quickly assembled and cost-effective. Approximately 3,000 Parkinson Houses were constructed, primarily in urban and suburban areas across the UK, with a notable concentration in Blackpool.

Manufacturers and Designers

J Parkinson & Sons Ltd, the manufacturers of these houses, collaborated with various designers to create a property that met the housing demands of the time. The design focused on efficiency and durability, although some of the materials and construction methods used have led to issues over time.

Characteristics of the Parkinson House

Structural Features

Roof

The Parkinson House typically features a steep or medium pitch hipped roof covered in concrete tiles. This design choice was intended to provide durability and resistance to the elements, although it can pose challenges in terms of maintenance and repair.

Walls

The external walls of the Parkinson House are rendered throughout, providing a uniform appearance. The walls are constructed using 2-inch breeze PC blocks, with a 4-inch cavity and an additional 2-inch breeze PC block layer. This construction method aimed to provide insulation and structural integrity.

Floors

The ground floor of the Parkinson House is made of concrete, while the first floor consists of timber boarding on timber joists. This combination of materials was chosen for its cost-effectiveness and ease of construction.

Main Frame

The main frame of the Parkinson House is composed of pre-cast reinforced concrete (PRC) columns and beams. These components are positioned in foundation pockets with inverted T-shaped corbels at the first floor and eaves level. The frame layout includes intermediate columns and formed slots that provide a continuous cavity.

Variants

There are several variants of the Parkinson House, which include differences in the construction of external walls, separating walls, and partitions. For example, some variants feature external walls and separating walls made of 3-inch PC blocks with a 3-inch cavity and 2-inch breeze PC blocks. Additionally, partitions in some variants are made entirely of PC blocks.

Typical Hazards and Risks

Designated Defective

The Parkinson House is classified as defective under the Defective Premises Act. This classification is due to several inherent issues in the construction and materials used, which can pose significant risks to the property’s structural integrity and safety.

Common Defects

Cracking of Render

One of the most common defects in Parkinson Houses is the cracking of the render on the external walls. This issue can lead to water ingress, which can cause further damage to the structure and interior of the property.

Carbonation-Related Corrosion

Another significant issue is the carbonation-related corrosion of reinforcement in the PRC beams. This corrosion can weaken the structural integrity of the property, leading to potential safety hazards.

Inspection Guide for Surveyors

Identifying Characteristics

When inspecting a Parkinson House, surveyors should look for the following identifying characteristics:
– 2-storey semi-detached structure
– Steep or medium pitch hipped roof covered in concrete tiles
– Rendered external walls

Construction Details

Substructure

The substructure of the Parkinson House typically consists of a reinforced concrete (RC) raft or RC beam foundation. This foundation type was chosen for its stability and ability to support the weight of the structure.

Frame

The frame of the Parkinson House includes 8-inch by 8-inch PRC columns positioned in foundation pockets, with inverted T-shaped corbels at the first floor and eaves level. The frame also includes 8-inch by 2-inch PRC beams and intermediate columns, with formed slots providing a continuous cavity.

External Walls

The external walls are constructed using 2-inch breeze PC blocks, with a 4-inch cavity and an additional 2-inch breeze PC block layer. This construction method provides insulation and structural support.

Separating Wall

The separating wall between properties is made of a 2-inch breeze PC block cavity wall. This design helps to reduce noise transmission and provides additional structural support.

Partitions

Partitions within the Parkinson House are made of block to the first floor level, with lath and plaster above. This combination of materials was chosen for its cost-effectiveness and ease of construction.

Ground Floor

The ground floor is made of concrete, providing a durable and stable base for the property.

First Floor

The first floor consists of timber boarding on timber joists. This construction method was chosen for its cost-effectiveness and ease of installation.

Roof

The roof is made of timber and covered with concrete tiles. This design provides durability and resistance to the elements, although it can pose challenges in terms of maintenance and repair.

Typical Defects

When inspecting a Parkinson House, surveyors should be aware of the following typical defects:

Cracking of Render

Cracking of the render on the external walls is a common issue in Parkinson Houses. This defect can lead to water ingress, which can cause further damage to the structure and interior of the property.

Carbonation-Related Corrosion

Carbonation-related corrosion of reinforcement in the PRC beams is another significant issue. This corrosion can weaken the structural integrity of the property, leading to potential safety hazards.

Practical Tips for Buyers and Investors

Assessing Structural Integrity

When considering the purchase of a Parkinson House, it is essential to assess the structural integrity of the property. This assessment should include a thorough inspection of the PRC columns and beams for signs of corrosion and cracking. Additionally, the render on the external walls should be examined for any signs of cracking or damage.

Evaluating Maintenance and Repair Costs

Potential buyers and investors should also consider the maintenance and repair costs associated with owning a Parkinson House. Due to the common defects in these properties, regular maintenance and repairs may be necessary to ensure the property’s safety and structural integrity. It is essential to factor these costs into the overall investment decision.

Understanding Legal Implications

Given that the Parkinson House is classified as defective under the Defective Premises Act, it is crucial to understand the legal implications of owning such a property. Buyers and investors should seek legal advice to ensure they are fully aware of their rights and responsibilities.

Seeking Professional Advice

Before making a purchase, it is highly recommended to seek professional advice from a qualified surveyor. A thorough building survey can identify any hidden defects and provide a detailed assessment of the property’s condition. This information is invaluable in making an informed decision and avoiding potential pitfalls.

Conclusion

The Parkinson House, with its unique construction and historical significance, presents both opportunities and challenges for home buyers and investors. Understanding the typical characteristics, common defects, and potential risks associated with these properties is crucial in making an informed decision. By conducting a thorough inspection and seeking professional advice, buyers and investors can safeguard their investment and ensure the long-term safety and integrity of their property.

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.

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