Box Gutters South Africa covers two different things: square-edged gutters fixed to the outside of the roof, and concealed box gutters built into the roof between slopes or behind parapets. Describe yours once and compare quotes.
- External box-profile gutters suit modern homes and commercial buildings.
- Concealed box gutters need careful sizing, because overflow can run into the building.
Describe the job once and compare box gutter quotes.
Get Box Gutter QuotesExternal Box-Profile vs Concealed Box Gutters
External box-profile gutters
Square or rectangular gutters fixed to the fascia, in aluminium, Chromadek or galvanised steel. They work like any eaves gutter. If they overflow, water falls outside the building.
Concealed or internal box gutters
Channels inside the roof: behind parapet walls, between two roof slopes (valley box gutters), or set into the eaves. If they block or overflow, water goes into the ceiling or walls. They need a waterproof lining, adequate outlets and an overflow route.
Where Box Gutters Are Used
- Modern houses with flat-look rooflines and parapets.
- Shops and offices with parapet walls. See commercial gutters.
- Warehouses and factories with multiple roof spans. See industrial gutters.
- Older buildings with original built-in gutters.
Sizing Considerations
- Roof area draining into the gutter.
- Width and depth of the channel, including room for a person to clean it on large roofs.
- Fall along the gutter towards outlets.
- Number and size of outlets and sumps.
- Storm intensity in your area.
Outlets and Overflow Provisions
Outlets need to be large enough and spaced so no part of the gutter holds water. A sump at each outlet helps water drain quickly. Concealed box gutters should have an overflow, such as a spitter through the parapet or an overflow outlet, so a blocked outlet shows up as visible water outside rather than a leak inside.
Box Gutter Replacement
- Lifting roof sheets or tiles along the edge to remove the old gutter.
- Checking and repairing the support boards or framing below.
- Fitting a new formed or fabricated gutter, often made to measure. See custom gutters.
- New outlets, sumps and overflows.
- Relaying and flashing the roof edge.
Box Gutter Prices
| Item | Ballpark price |
|---|---|
| Custom box gutters, installed | R150 - R250+ per metre |
| Galvanised box gutter 100 x 75 mm, 6 m length, retail | About R310 |
| Steel gutters, commercial, installed | R250 - R400 per metre |
| Concealed box gutter replacement | Priced per job |
Ballpark figures, not quotations. Compiled from price guides and retailer listings published on South African websites (updated between July 2025 and January 2026, plus an undated retailer listing), checked 15 October 2026 and rounded. Sources disagree, and most installed rates come from Gauteng guides, so quotes in your area can differ. We found no published prices for concealed box gutter replacement, because roof work and access vary so much. Unless a row says so, the sources do not state whether VAT is included, so confirm VAT on every quote. Photos or a site visit and a written quote set the actual price.
See gutter installation and gutter prices for other options, or Gutters South Africa for every gutter service.
Free, with no obligation to appoint anyone.
Get Box Gutter QuotesFrequently Asked Questions
What is the difference between a box gutter and a box-profile gutter?
A box-profile gutter is a square-shaped eaves gutter fixed outside the roof. A box gutter in the building sense is a concealed channel inside the roof line. The second needs more care because overflow goes inside.
Why does my concealed box gutter leak into the ceiling?
Common causes are blocked outlets, a failed lining or joint, too little fall, or no overflow. A contractor should inspect it before quoting.
Can a concealed box gutter be replaced with an external gutter?
Sometimes. It depends on the roof design and how the roof edge can be changed. Ask contractors whether it is practical for your roof.
How often should box gutters be cleaned?
At least once a year, and more often under trees. Large box gutters on commercial roofs often need a maintenance schedule.
Related Services
Gutters South Africa is a free quote-comparison service. Work is assessed, quoted and carried out by independent contractors, and your agreement is with the contractor you appoint. Ask each one for a written quote, what is and is not included, proof of insurance and the payment terms before paying anything.
Box Gutters South Africa. Describe your job once and compare quotes from independent contractors.
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