Overview
The Macfarlane house is a rare system-built property dating from 1926 and manufactured by Walter Macfarlane & Co. Only two semi-detached bungalows of this type were ever constructed, making surviving examples highly unusual within the UK housing stock.
These properties reflect early 20th-century experimentation with prefabrication and metal construction, combining cast iron structural elements with timber and fibreboard components.
Macfarlane houses were manufactured by Walter Macfarlane & Co., a firm renowned for cast iron engineering. The system relied heavily on bolted cast iron panels and stanchions, supported by timber framing and early fibreboard linings.
Typical characteristics & construction
Macfarlane houses were constructed as single-storey semi-detached bungalows. The structural frame comprises cast iron stanchions, beams, rafters and ceiling ties, with bolted cast iron wall panels supported by timber framing.
Roofs are shallow pitch and hipped in form, finished with asbestos cement slates fixed over timber boarding and purlins supported on cast iron clips.
| Element | Typical construction | Inspection focus |
|---|---|---|
| Substructure | Vented concrete foundation with damp-proof course | Settlement, moisture ingress, DPC condition |
| Frame | Cast iron stanchions, beams, rafters and ceiling ties | Corrosion, distortion, protective coating condition |
| External walls | Rendered cast iron panels with timber framing and fibreboard lining | Cracking, moisture penetration, panel fixings |
| Roof | Timber boarding with asbestos cement slates | Asbestos condition, leaks, fixings |
| Internal linings | Timber stud partitions with plasterboard and fibreboard ceilings | Dampness, sagging, cracking |
Potential hazards & inspection priorities
The most significant inspection risks relate to asbestos-containing roofing materials, corrosion of cast iron structural elements, and moisture ingress affecting timber and internal linings.
Failure of protective coatings to cast iron components can allow corrosion to develop, potentially affecting structural performance. Moisture ingress, particularly where the damp-proof course is compromised, can accelerate deterioration.
Is this house right for you?
A Macfarlane house is suited to purchasers who understand early system-built construction and are prepared to manage specialist materials and ongoing maintenance requirements.
- Commission a full building survey
- Assess asbestos condition and management requirements
- Monitor cast iron elements for corrosion or movement
Particular caution is advised where evidence of moisture ingress or structural movement is present.
Mortgage & resale considerations
Mortgage and resale prospects are influenced by the clarity of professional reporting, the condition of structural elements, and how known risks such as asbestos are managed.
Clear survey documentation and evidence of maintenance are commonly influential factors.
What a survey can — and cannot — tell you
A building survey provides an informed assessment of the visible condition and construction of a Macfarlane house. Inspections are non-intrusive and limited to areas that are accessible at the time of inspection.
- Identify visible corrosion to cast iron components and fixings
- Assess signs of dampness, moisture ingress, and condensation risk
- Comment on asbestos cement roof coverings and external envelope condition
- Review the general condition of accessible floors, ceilings, and partitions
- Highlight defects requiring repair, monitoring, or further investigation
However, there are limitations to what a survey can determine without intrusive investigation.
- Confirm the internal condition of concealed cast iron elements
- Assess hidden structural connections behind linings
- Determine the full extent of corrosion beneath finishes
- Inspect areas that are inaccessible at the time of inspection
Where higher-risk indicators are identified, further specialist or intrusive investigation may be recommended.
For a thorough building survey in Greater London, an instant quotation can be obtained through the online survey calculator.
Considering a Macfarlane house?
A detailed building survey can help clarify construction-specific risks before committing to a purchase.
Get your instant survey quoteDisclaimer: This article is provided for general educational purposes only and is based on industry research, professional knowledge, and experience. It does not relate to any specific property and should not be relied upon when making a purchasing decision. Prospective purchasers should always commission an independent RICS-qualified surveyor to conduct a full inspection and provide a report on the actual condition of any property of interest.
