Overview
The Tenaplas house is a rare form of non-traditional housing developed during the 1940s. Manufactured by Tenaplas Ltd in collaboration with Edron Trust, these properties were produced during a period of post-war experimentation in construction methods. Only two Tenaplas houses were ever built, making this system one of the least common non-traditional house types.
Tenaplas houses were system-built dwellings developed in the 1940s using reinforced concrete framing combined with hollow woodwool slab infill panels. The design was intended to address housing shortages following World War II through innovative construction techniques.
Typical characteristics & construction
The Tenaplas house is a two-storey semi-detached property with a medium pitch hipped roof finished in clay tiles. External walls are rendered with a roughcast finish, giving the property a distinctive appearance associated with post-war experimental housing.
Internally, the construction combines reinforced concrete structural elements with hollow woodwool slab infill panels and concrete block partitions. The form and materials reflect the innovation of the period while introducing long-term maintenance considerations.
| Element | Typical construction | Inspection focus |
|---|---|---|
| Substructure | Concrete underbuilding with concrete slab and damp-proof course | Cracking, settlement, effectiveness of DPC |
| External walls | Hollow woodwool slabs with reinforced concrete posts, columns, and string courses | Cracking, spalling, corrosion, moisture ingress |
| Separating wall | Concrete posts with hollow woodwool slab infill | Cracking, soundness, moisture penetration |
| Ground floor | Urea-resin bonded blocks on bitumen DPM over concrete | Dampness, movement, surface condition |
| First floor | Timber boarding on timber joists | Deflection, rot, insect attack |
| Roof | Timber rafters and purlins with clay tile covering | Tile condition, timber decay, leaks |
Potential hazards & inspection priorities
The primary concern with Tenaplas houses is the long-term performance of reinforced concrete elements. Corrosion of embedded steel reinforcement can lead to cracking and spalling, reducing structural integrity.
Moisture ingress is another common risk, particularly where render finishes, damp-proof courses, or detailing around openings have deteriorated. Thermal insulation levels are limited by modern standards, and the potential presence of asbestos-containing materials must also be considered given the construction period.
Is this house right for you?
A Tenaplas house may be appropriate for purchasers who understand non-traditional construction and are prepared to rely on detailed professional inspection.
- Commission a full building survey
- Pay particular attention to reinforced concrete condition
- Assess moisture management and insulation limitations
Additional caution is warranted where there is evidence of corrosion, dampness, or deferred maintenance.
Mortgage & resale considerations
Mortgage and resale acceptance for non-traditional properties is influenced by construction type, condition, and the clarity of professional reporting. Criteria can vary between lenders and may change over time.
Clear survey findings, evidence of maintenance, and the absence of unresolved structural or moisture-related defects are commonly important factors.
What a survey can — and cannot — tell you
A building survey provides an informed assessment of the visible condition and construction of a Tenaplas house. Inspections are non-intrusive and limited to areas that are accessible at the time of inspection.
- Identify visible cracking and spalling to reinforced concrete elements
- Assess signs of dampness, moisture ingress, and condensation risk
- Comment on roof coverings, drainage details, and external finishes
- 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 condition of concealed steel reinforcement
- Assess hidden structural elements behind finishes
- Determine the full extent of concrete carbonation or internal deterioration
- Inspect areas that are inaccessible or covered 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 Tenaplas 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.
