Mould and damp damage repairs

It depends on the condition of the affected materials.

Mould cleaning - for affected surfaces that can stay.

Mould and damp damage repairs - for damaged walls, ceilings or finishes that need repairing or replacing.

Some homes need both. We look at the problem and explain what we recommend before quoting.

Possible causes include condensation, leaks and other moisture problems.

Mould around a window, a damp wardrobe and a stained ceiling can point to different problems. We look at the affected area, its condition and the history you describe before discussing suitable treatment and repairs.

Tell us when the problem appears, whether it changes with weather or use of the room, and what has already been tried. Condensation, ventilation and leaks may need consideration. If the cause remains uncertain, we explain the limits of what we can establish and any further investigation needed.

Sometimes. It depends on the surface, extent and conditions.

A small patch on a sound washable surface may be manageable with suitable precautions and moisture control. Recurring growth, wet porous materials, flood contamination and hidden damage need a different assessment. Painting over it does not deal with the cause.

Ask about recurring growth or damaged materials →

Address the moisture conditions as well as the existing growth.

Mould spores occur naturally in indoor and outdoor air. Remove existing mould and address the conditions that allow it to grow: leaks, dampness, indoor moisture and cold surfaces. Suitable ventilation, heating and insulation can help. Treatment alone cannot keep mould away if those conditions remain.

Yes. For cleaning and treatment of visible growth, see mould treatment. For wet windows or steamy rooms, explore ventilation and condensation.

Painting is one stage of a moisture repair, not the starting point for every affected surface. We consider treatment, moisture control, drying and preparation in sequence so the proposed finish is appropriate for the condition of the room.

For an occupied home, we agree access, protection of belongings and the areas needed for work. If opening an area reveals additional damage, the extra scope and price are discussed before proceeding.

Treatment time and drying time are different. Agree restricted areas, pets, occupants, product instructions and completion checks. Future moisture can cause growth to return, so cleaning needs to sit alongside maintenance and suitable ventilation.

Sources: HealthEd - mould after flooding (opens in a new tab); CDC/NIOSH - mould testing and remediation (supplementary guidance) (opens in a new tab).

Yes. A damaged shower lining or damp bathroom wall can call for a focused repair. We discuss the surrounding materials before agreeing suitable shower-lining, wall or ceiling repairs and finishing. Any plumbing, electrical or specialist waterproofing work is outside our scope and is arranged directly by the client.

Suitable window and door sealing can be included where it forms part of the agreed repairs. We consider ventilation and moisture together when discussing improvements.

No. We can flag ventilation concerns during the agreed mould assessment or repair-scoping visit. We do not install, replace or arrange extractor fans, ducting or ventilation systems. The client contacts a suitable specialist directly. Our quotation covers only the treatment or selected repairs expressly agreed with you.

We use professional Actichem products selected for the surfaces and work required. Where suitable, a protective treatment can help discourage mould regrowth, alongside addressing the moisture conditions.

The affected area, materials, moisture and agreed work determine the price and timing.

Single-room ceilings and walls typically cost $350 to $495 including GST (NZD). Selected-area treatment across several rooms is priced as per quote for localised patches agreed across the rooms. Your quote confirms the affected area, surfaces and severity. Treatment normally takes a couple of hours; we aim to finish the agreed rooms in one visit. Drying and repairs are quoted separately, with their own timing.

Yes. Bring the complete report and photographs and identify the repair items you want quoted. A free repair-scoping visit establishes relevant items and quantities, including where the report has not listed them. Tell us what is already arranged with other contractors.

Your quotation identifies the included treatment, selected shower-lining, wall or ceiling repairs, preparation and repainting. Floor and subfloor repairs are not offered. We explain items needing clarification, another provider or separately agreed investigation. Completion information records the agreed repairs; it does not certify the whole property or guarantee a later inspection outcome.

A standalone mould assessment is a separate investigation with documented findings. See the $339.25 including GST mould assessment →

When you want a standalone investigation and documented findings, rather than only a repair quotation.

The mould assessment considers the growth and conditions contributing to it. The water and dampness assessment considers wetness, moisture damage and suspected water entry or condensation. We agree the scope before booking.

A report records findings and recommendations, including uncertainty and any further investigation needed. It covers the agreed assessment rather than certifying the whole property.

Choose surface testing to learn about the sampled growth. Choose a building assessment to consider visible moisture damage, material condition and repair options. You can request testing without explaining your private reason.

A thermal camera does not see mould through walls, and neither a test nor a property report diagnoses symptoms or certifies medical safety.

Explore nationwide laboratory mould testing or arrange an on-site mould assessment.

Use the linked guides below for the detail that fits your question.

• Mould removal costs, timing and access →
• Mould assessment, testing and health questions →
• Mould cleaning, repairs and preventing recurrence →
• Mould in rentals, workplaces and rural properties →

Guidance reviewed 7 October 2026. Information is national; our service areas are stated separately.