Reviewed and updated October 6, 2026.
A gutter replacement quote should identify the profile, width and downspouts being proposed. This comparison explains how to read those choices and what to ask before approving a system for an Ontario home.
In This Article
Understanding the size on your quote
Gutters are commonly described by a nominal width, such as 4, 5 or 6 inches. The profile determines their shape. Before ordering a replacement, confirm the existing profile, the supplier's dimensions and the proposed outlet and downspout sizes.
| Choice | What it tells you | Question for the installer |
|---|---|---|
| 5-inch K-style | A common residential gutter profile | How does its capacity match each roof section? |
| 6-inch K-style | A larger nominal gutter width | Are the outlets, downspouts and fascia suitable too? |
| Half-round | A different gutter shape | What capacity and mounting details apply to this exact profile? |
| Existing 4-inch | A smaller installed profile | Should the drainage layout change when it is replaced? |
K-style and half-round profiles
K-style and half-round gutters differ in shape, appearance and mounting details. Two gutters with the same nominal width do not necessarily provide the same drainage capacity. Where appearance matters, compare profile samples against the fascia and roof edge before accepting the quote.
Questions for different roof layouts
- Simple bungalow: ask which roof faces feed the front and rear gutters and where each downspout discharges.
- Two-storey house: identify upper downspouts that send water onto a lower roof.
- Roof with valleys or dormers: ask how concentrated runoff is handled at each junction.
- Heritage property: check the intended profile, mounting condition and any applicable property requirements before ordering.
- Addition or garage: check its own drainage area instead of copying the main house specification.
These are inspection prompts, not automatic size recommendations. A steep pitch or a particular construction date alone does not establish which gutter will perform properly.
Compare the complete drainage route
Ask for gutter width, downspout size, outlet size and downspout locations together. Include the discharge route in the quote, especially if water enters an underground pipe. A restriction beyond the downspout can cause problems even when the gutters are large enough.
For the assessment process and a roof-catchment checklist, read the eavestrough sizing guide. It explains why roof area and local design rainfall matter.
Compare installation quotes fairly
Record the same scope for each option: material, profile, measured run lengths, corners, outlets, downspouts, fastening, removal and disposal, and any fascia work. Ask whether guards are included and which exact model is proposed. A price per foot without these details can hide important differences.
For eavestrough installation and repairs in Kitchener-Waterloo, Cambridge and Guelph, send photos of the roofline and explain whether the problem is leaking, sagging or overflowing. A written property-specific quote is more useful than a price based solely on gutter width.
Frequently asked questions
Should I replace a 5-inch gutter with a 6-inch gutter?
Only after checking why the existing system is failing. Cleaning, correcting slope or changing outlets may address the problem; other roofs need more drainage capacity.
Can I reuse the old downspouts?
Ask the installer to check their condition, size, outlet connection and route against the proposed system. Reuse should be a considered part of the quote.
Is half-round the same capacity as K-style?
Do not assume that equal widths mean equal capacity. Compare the supplier's data for the exact profile and installation.
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