What Should You Check Before Renovating an Older House in Zimbabwe?

Renovation budgets get into trouble when the scope is defined by what the building looks like rather than what it actually is. A fresh coat of paint hides damp. A flat ceiling hides roof damage. Old plaster conceals ring beam cracking that has been progressing slowly for years. A renovation quote based on visible conditions is a quote based on incomplete information.

The checks described in this article should happen before a contractor visits to price the work. They will not all require a professional assessment. Some are straightforward observations anyone can make. Others, specifically those involving structure, electrical installation and drainage, require a qualified professional to be meaningful. What they produce, taken together, is a renovation scope grounded in fact rather than assumption.

Structure

Structural problems are the most expensive renovation discoveries. Finding them after walls have been plastered, floors tiled and ceilings installed means doing the work twice.

Ring beam. The ring beam runs around the top of the walls and carries the roof. It is almost always plastered and painted over. Where the plaster is intact, have a structural engineer assess it before work begins. Look for the early warning signs that warrant urgent inspection:

• Horizontal cracking along the line of the ring beam
• Dark staining suggesting moisture penetration at this level
• Exposed or rusting steel protruding anywhere along the top of the wall
• Concrete spalling at corners or below the wall plate

Walls. Distinguish surface cracking in plaster from structural cracking in the masonry behind it. Run a fingernail across a crack: surface cracks stop at the plaster surface. Structural cracks in the block or brick continue through the wall and often travel diagonally from window or door corners. Structural cracking requires investigation before it is simply replastered.

Foundations and settlement. Look for evidence of differential settlement: doors or windows that no longer fit squarely in their frames, floors that are noticeably uneven, or cracks that have opened progressively over time rather than appearing suddenly after an event. On older properties built on clay soils, seasonal movement over many years can have caused cumulative displacement in the foundations.

Before any renovation work begins on a structurally suspect older building, commission a written assessment from a structural engineer registered with the Engineering Council of Zimbabwe.

Roof and Ceiling

The roof is the element that protects everything below it. Its condition governs the condition of the ceiling, the walls and the floor. Assessing it last is a common and expensive mistake.

Roof covering. If accessible, inspect the roof covering from above. Check for:

• Cracked, corroded or displaced sheeting
• Missing or deteriorated ridge capping
• Rust staining, particularly around fixings and at sheet overlaps
• Evidence of patched repairs that may be masking ongoing deterioration

Roof structure. The timber structure sitting under the covering is visible only after the ceiling is removed. Do not assume it is sound because the ceiling below appears intact. Water that has entered through a damaged roof covering and dried out before causing ceiling staining can have saturated and weakened the timber above without leaving any visible trace at ceiling level.

Asbestos. Many Zimbabwean houses built before the late 1980s used asbestos cement roofing sheets and asbestos-based ceiling boards. If the property dates from this period and has not had its roof or ceiling replaced, confirm whether asbestos materials are present before any cutting, drilling or demolition work is instructed. Specialist removal is required if they are.

Gutters and drainage. Blocked or broken gutters divert water down external walls rather than into drainage pipes. Look for staining on external plaster directly below gutter lines, moss or algae growth at wall base, and internal damp on walls adjacent to external corners where water has been tracking down.

Electrical Installation

An older electrical installation has age-related risks that are not visible from outside the conduit or behind the switchboard cover. Before the renovation scope is finalised, have a licensed electrician assess:

• Whether the wiring is copper or aluminium. Single-core aluminium wiring was common in Zimbabwean residential construction before the 1990s. It is more brittle than copper, behaves differently under thermal cycling, and creates connection risks over time at terminations and joins.
• Whether earth leakage circuit breakers are fitted. An older switchboard may have rewirable fuses rather than modern circuit breakers, and no earth leakage protection.
• The general condition of the distribution board: evidence of overheating, amateur additions, overcrowded wiring, or double-pole isolation that does not function correctly.
• The state of socket outlets and switches throughout the building, particularly those showing discolouration, crack damage or loose mounting.

A renovation that replasters the walls without first determining whether the electrical installation needs replacement will, in the worst case, result in freshly plastered walls being cut open to run new conduit.

Plumbing and Drainage

Supply pipes. Older galvanised steel supply pipes corrode internally. Externally they may look intact while internal bore reduction from corrosion deposits significantly limits flow and water pressure. A plumber can assess flow rate and pressure at fixture outlets to determine whether pipe replacement is warranted.

Hot water. Older electric geysers with corroded sacrificial anodes and degraded insulation are a common point of failure and energy loss. If the geyser is more than ten years old, its condition should be part of the pre-renovation assessment.

Drainage. Buried drainage cannot be visually inspected without specialist equipment, but blockage history, slow-draining fixtures and effluent odours are all indicators of a drainage system that needs investigation before renovation work closes it in behind new floors and walls.

Ask the current or previous occupants: are there drains that block regularly? Has there been a sewage overflow in the last few years? Has the floor drain in any bathroom or utility space ever backed up?

Layout Changes and Structural Implications

If the renovation intends to change the floor plan by removing, relocating or adding walls, confirm before work begins whether any of the walls proposed for removal are structural. In older Zimbabwean construction, internal walls are not always obviously structural from their appearance or position.

A structural engineer can confirm wall status from the plans, if plans are available, or by inspection. An internal wall that turns out to be load-bearing after it has already been partially demolished creates a structural emergency and a significant unplanned cost.

Also confirm: does the planned layout change require an amended building plan submission? Under the Urban Councils Act [Chapter 29:15], structural modifications to an existing building require plan approval. The 2026 reforms that abolished the council building permit step did not remove the requirement for compliant, professionally prepared plans under Statutory Instrument 56 of 2025.

What to Commission Before the Renovation Quote

Collect the following assessments before inviting contractors to price the work:

• Structural engineer's written report covering ring beam, structural cracking, foundations and any proposed wall removals
• Electrician's condition assessment covering wiring type, switchboard, earthing and earth leakage protection
• Plumber's condition assessment covering supply pipes, geyser, drainage history and outlet pressure
• Confirmation of whether asbestos materials are present in roof covering and ceiling boards
• Updated building plans if the layout is to be changed or if existing approved plans cannot be located

With these in hand, a renovation quote can be meaningfully compared between contractors. Without them, contractors are pricing partially known scope and the budget will shift when the unknown conditions are revealed during construction.

On NiceBuilt's Eastview renovation project in Kadoma, the scope included roof removal, demolition, ring beam reconstruction, new wallplate and gables, reinforced concrete and brickwork. Work that presents externally as renovation regularly reveals conditions that require structural reconstruction once the building is opened. Pre-renovation assessment reduces the likelihood of that revelation arriving as a surprise during construction.

Planning a Renovation in Kadoma?

NiceBuilt's renovation work in Kadoma covers cosmetic finishes through to major structural renovation. If you need a professional view of what your property actually requires before committing to a renovation scope, talk to the team.

Learn more about NiceBuilt's renovation service

Sources

1. Engineering Council of Zimbabwe. Registration requirement for structural engineers under the Engineering Council Act [Chapter 27:22], cited in DLA Piper Real World. "General construction law in Zimbabwe." dlapiperrealworld.com. Last modified May 2025.
2. Propertyzone (Fannuel Mirirayi). "How to Renovate a Zimbabwe Property Without Overbuilding: ROI, Suburb Ceilings and Diminishing Returns." propzone.co.zw. 15 August 2026. Used for: the structure-before-cosmetics principle and the sequencing of renovation assessment.
3. NiceBuilt Construction. Building renovations project, Eastview, Kadoma. nicebuiltconstruction.co.zw. Accessed September 2026. Used for: first-party evidence that a renovation in Kadoma revealed the need for ring beam reconstruction, RC work and structural brickwork.
4. The Herald Zimbabwe. "Building construction: Soil type very important (Part 2)." heraldonline.co.zw. 22 October 2022. Used for: differential settlement causes in Zimbabwean soil conditions, including clay soil expansion and contraction.
5. Structure and Design Magazine Zimbabwe. "Foundations in Bad Clay Soils: Learn Something with Simanga Madhlabuta." structureanddesignzim.com. 12 November 2024. Used for: cumulative foundation displacement caused by seasonal soil movement in Zimbabwe.
6. Government of Zimbabwe. Urban Councils Act [Chapter 29:15] Used for: the requirement for building plan approval on structural modifications to existing buildings.
7. Government of Zimbabwe. Statutory Instrument 56 of 2025 Used for: the requirement that plans be prepared by ACZ-registered practitioners; applies to renovation plan submissions.