A covered walkway is one of the simplest structures on a commercial site and one of the most used. It keeps a route between two points dry, shaded and safe, and once it is built it is walked several hundred times a day for the next twenty years.
Because the structure is simple, the design decisions are concentrated: how wide, how high, where the posts land, what the roof is made of, and how it meets the buildings at either end. This guide works through each of those in turn, then covers the consent position in New Zealand.
Key Takeaways
- Width and clearance come first. A covered walkway is sized around the people and vehicles using it. Two people passing comfortably needs about 2.4 metres, and any route that forms part of an accessible route must hold a minimum 1200mm clear width under Building Code clause D1.
- The roof profile decides where the posts go. A structural roof sheet that spans up to 6 metres unsupported removes the mid-run posts and the purlin layer, which is what keeps the walking route clear and the structure simple.
- Most commercial walkways need building consent. Schedule 1 of the Building Act exempts only small roofed structures. Plan for consent, and use a PS1 sized to the site’s wind and snow zone to support the application.
Table of Contents
Where Covered Walkways Are Used
The structure barely changes between sectors. The brief does. A school walkway is designed around several hundred people moving at once for four minutes a day; an airport walkway is designed around continuous, unpredictable flow with luggage. Knowing which pressure your site applies is what makes the rest of the decisions straightforward.
Application | Typical use | What drives the design |
|---|---|---|
Education | Between classroom blocks, gate to entry, bus bays, bike and scooter storage, sheltered outdoor learning | Peak-flow width at bell times, durability against daily wear, and an install window that fits a term break |
Transport | Terminal connections, bus stops, park-and-ride, drop-off zones, EV charging bays | Continuous operation during construction, luggage and trolley clearance, and a finish that suits a public frontage |
Healthcare and aged care | Between wings, entries and ambulance bays, resident walkways to communal buildings | Accessible route widths, level thresholds, slip resistance and good lighting |
Commercial and industrial | Carpark to entry, between tenancies and workshops, loading bay approaches, sheltered queuing | Vehicle swept paths, forklift clearance, post protection in trafficked areas, and visual fit with the building |
Start With the Route
Walk the route before you draw it, and mark what the structure has to clear.
- What the post line has to miss. Vehicle swept paths, service covers and manholes, underground services, tree roots, and door swings from the buildings either side. Posts are cheap to move on a drawing and expensive to move in concrete.
- The levels along the route. A walkway follows the ground, so a route across a slope needs the roof line and the clearance checked at both ends, not just at the midpoint. Steps or ramps in the route dictate where the structure can start and stop.
- The prevailing weather. In an exposed location, wind-driven rain comes in under the edge from one predictable direction. Partial side screening on that side does more for usability than adding width.
- Where the route meets a building. Note which end connects to an existing structure, because that decides both the configuration and the amount of engineering the project needs.
- Services you will want later. Lighting, CCTV, speakers and signage are far easier to run through posts and beams during fabrication than to retrofit afterwards. Decide now, even if the budget defers the install.
In trafficked areas, add one more note to the plan: whether posts need bollards or a protective kerb. A post clipped by a delivery truck in year two is a structural problem, not a cosmetic one.
Sizing the Walkway
With the route set, the next question is how much of it you have to cover, and how generously.
Width
Width is the decision most often got wrong, because it is usually set against a plan rather than against peak use. Three reference points:
- Accessible routes. Where the walkway forms part of an accessible route, Building Code clause D1 and NZS 4121 require a minimum 1200mm clear width. Clear means clear of handrails, posts, downpipes, bollards and any other projection, so it is measured between obstructions rather than between post centres.
- Two-way pedestrian flow. Around 2.4 metres allows two people to pass comfortably, including one with a pram, trolley or luggage. This is the practical minimum for a route with steady two-way traffic.
- Peak flow and waiting. School corridors at bell times, bus bays and drop-off zones need more, often 3 metres or wider, because people stop and gather rather than keep moving.
Weather narrows the effective width. In an exposed location the outer 300 to 500mm of a walkway gets wet in a squall, so a 2.4 metre walkway behaves like a 1.8 metre one on the worst days, which are exactly the days it matters. Either add width or screen the weather side.
Height and clearance
Height is a balance. Too low and the structure feels oppressive and blocks light into adjacent rooms; too high and it stops working as shelter, because rain blows in under the edge.
- Pedestrian-only routes. A clear height of about 2.4 to 2.7 metres suits most walkways. Streamline’s standard structures run 2.1 metres from concrete to roof, with extra height available where the route needs it.
- Vehicle access. Anywhere a vehicle may cross or park under the structure, clearance has to suit the tallest vehicle that will realistically use it, including service and delivery vehicles, and it should be signposted.
- Falls and drainage. The roof needs a fall to move water to the gutter line, so the low edge sets your real clearance. Check the height at the low point, not the high one.
Length and bay spacing
Length is rarely the constraint. Bay-based structures repeat modules for as long as the route requires, which is how a walkway runs the full frontage of a terminal or depot. What matters is where the bays land, and that comes straight off the route plan: bay spacing should be set so posts miss the obstructions you marked, rather than dividing the length into equal parts and hoping.
Dimension | Typical planning figure | Note |
|---|---|---|
Minimum accessible clear width | 1200mm | Building Code clause D1 and NZS 4121, measured clear of posts, handrails and downpipes |
Comfortable two-way width | 2.4m | Two people passing, one with a pram or luggage |
Peak-flow or waiting areas | 3m and wider | School bell times, bus bays, drop-off and queuing |
Effective width lost to weather | 300mm to 500mm each side | Exposed sites in wind-driven rain, unless the weather side is screened |
Clear height, pedestrian route | 2.4m to 2.7m | Measured at the low edge of the roof, not the ridge |
Choosing a Configuration
The route and the width together decide how the walkway carries its load. There are three options, and the site usually picks one for you.
Configuration | How it works | Best suited to |
|---|---|---|
Free-standing Image placeholder | Posts on both sides carry the roof. Nothing is fixed to any adjacent building. | Open runs across a carpark or courtyard, and any situation where you want to leave the existing building untouched |
Building-attached Image placeholder | One side is supported by the existing structure, the other by a post line. | Runs tight against a building where there is no room for a second post line |
Cantilevered Image placeholder | A single post line carries the roof, which projects to one or both sides. | Narrow footpaths, bus stops and any route where posts on the outer edge would obstruct traffic or pedestrians |
A second decision follows from the first. A single-sided run covers one route; a double-sided run covers two routes either side of a shared post line, which is common between parallel buildings and in bus and drop-off bays. Double-sided is usually more efficient per metre covered, but it commits the post line to the centre of the space, so check it against the obstructions on the route plan before you commit.
Roof form is the third. A flat or low pitch reads as a clean horizontal line and suits contemporary buildings; a pitched or curved roof sheds water faster and can echo an existing roofline. On long runs a consistent low pitch is generally the easier detail to resolve where the walkway meets other structures.
Roof and Sheeting
The configuration sets where the posts can go. The roof sheet decides how far apart they have to be.
Span, and why the profile matters
Most roofed walkways are built in layers: a structural frame, purlins across it, then roof sheeting fixed to the purlins. The sheet only has to span purlin to purlin, so the frame does the work and the component count climbs.
A high-rib structural profile carries load across the whole span instead. The PurlinDek 600 profile runs a 75mm rib that spans up to 6 metres unsupported, so no purlins are needed between the gutter beams. That removes a layer of steel, a layer of fixings and, on a wide walkway, the mid-run post line as well.
For a specifier the consequence is direct: a 6 metre clear span means a walkway up to that width keeps the whole route open, and the post line stays on the edges where the route plan wants it.
Property | PurlinDek 600 | Why it matters in a walkway |
|---|---|---|
Rib height and clear span | 75mm rib, up to 6m unsupported | Sets the post grid, and therefore how clear the route stays |
Load compliance | Meets NZS 4203 live load requirements | Wind, snow and seismic performance is documented rather than assumed |
Sub-framing | No purlins required between gutter beams | Fewer components to install, inspect and clean over the structure’s life |
Overhang | Up to 1.8m at 0.75 BMT | Extra cover at entries and bays without another post line |
Water carrying capacity | High-volume profile | Long runs in heavy rainfall without oversizing the drainage |
Opaque, translucent or a mix
Solid steel sheeting gives full weather and UV protection and the cleanest appearance. Its drawback is light: a long run against a building can darken the rooms it passes and make the walkway itself feel like a tunnel.
Translucent sheeting solves that, and is available in light transmission ratings from 47 to 70 percent, all UV-stabilised. The usual approach is not to choose one or the other but to specify translucent panels in selected bays, at entries, junctions and any point where daylight matters, and solid sheeting elsewhere.
Two things to weigh. Heat gain builds under translucent panels in summer, and rain noise is more noticeable on lightweight translucent sheet than on steel. Next to classrooms and consulting rooms, both are worth raising before the panels are specified rather than after.
Steel, coating and service life
New Zealand asks a lot of an outdoor steel structure: coastal salt spray across much of the country, high UV, driving rain, snow loading inland and very high wind zones on both islands. Three specification questions follow.
Is the coating rated for the exposure zone? Galvanised or pre-painted steel, specified against the site’s exposure rather than a national default. A PVDF coating holds colour and gloss longer under high UV than standard polyester systems.
Do the fixings match the structure? Fixings should carry the same exposure rating as the steel. Mismatched fixings are the usual first point of visible corrosion on an otherwise sound structure.
What is the durability statement, in writing? Streamline structures carry a 25-year durability statement, and PurlinDek has been in continuous production since the brand began, so replacement sheets still fit structures built two decades ago. For an asset owner writing a maintenance plan, a defined replacement path is worth more than a warranty period.
Colour belongs in the same conversation. Specifying to the existing site palette costs nothing at order stage and is expensive to change afterwards.
Drainage
A walkway roof is a long, narrow catchment, which concentrates a lot of water into a small number of downpipes. Set the gutter falls and downpipe positions with the post layout, not after it, so downpipes run down posts rather than arriving later as a surface fixing that eats into the clear width. Confirm where the water discharges to, because on most commercial sites that connection needs council or network approval.
Consent, PS1 and Programme
With the design resolved, the last question is what it takes to get it approved and built.
Does a covered walkway need building consent in NZ?
On a commercial site, assume yes and design accordingly. Schedule 1 of the Building Act 2004 exempts some small roofed structures from building consent, but the exemptions are size-bound and a walkway of any useful length will normally exceed them. A resource consent may also be triggered by height, site coverage, or a heritage or character overlay.
Confirm the position with the territorial authority early. It affects the programme far more than it affects the design, and it is the item most likely to move an install date.
What the PS1 has to cover
A PS1 producer statement is the standard way to demonstrate that the structure complies with clause B1 of the Building Code. Three things to check on any walkway PS1:
It is sized to your wind and snow zone. Loads vary sharply across New Zealand, and a structure engineered to a national average is not the same structure. The PS1 should state the zone it covers.
It covers the connection, not just the structure. Where the walkway is fixed to an existing building, the additional load on that building needs to sit inside the engineering scope or be covered by a separate check.
It is prepared for submission. Documentation written for council submission saves a re-cut by a consultant before the application can be lodged.
Streamline supplies PS1 documentation from in-house engineers as standard on commercial structures, sized to the site’s wind and snow zone. Ask for it while the layout is still being decided, because it is what confirms whether the proposed span and post grid work on your site.
Programme and site access
Most walkways are built across a route that is still in use, which makes the install window a design input rather than a construction detail. Education sites are the clearest case: work happens in term breaks, so consent, fabrication and delivery all have to complete before the break opens, and footings and structure are often split across two breaks to give concrete time to cure. The same logic applies to any site with a shutdown window, and it is the reason the consent question belongs at the start of a project rather than the end.
Project in Focus
Auckland Airport covered walkway
A sheltered connection between key terminal areas, designed for continuous public use, luggage and trolley clearance, and clean integration with the existing terminal buildings.
The clear-span PurlinDek structure keeps the route free of mid-run posts, while its clean underside gives the terminal frontage a modern, unobtrusive finish.
Getting the Design Right
A covered walkway is easy to specify badly and easy to specify well, and the difference is almost entirely in the first hour of design.
Walk the route and mark what the post line has to miss, because every later decision is constrained by that plan. Size it against peak use rather than against the drawing, and hold the accessible width clear of posts and downpipes rather than to post centres. Let the configuration follow from the site instead of from preference, and use the roof span to keep the route open rather than dropping supports into the middle of it. Resolve the connection to any existing building on paper, with the load, the fixing and the flashing all drawn. Then confirm the consent position early enough that it shapes the programme instead of interrupting it.
Everything after that is specification detail, and it is far easier to change than a post that has already been concreted into the wrong place.
Next Steps:
- Mark up the route. Plot the line, the obstructions the post grid has to miss and the levels at each end. It is the drawing every other decision depends on, and it is what we need to size a structure.
- Download the technical brochure. PurlinDek profile dimensions, span and load tables, fixing details and coating specification, for whoever is doing the structural check.
- See a completed commercial walkway. The Auckland Airport project, built across a route that could not close.
- Send us the route. Give us the length, the width you need to cover, the site location and any building you need to connect to. We will come back with a structure, a post layout and the PS1 scope.
Covered Walkways
Frequently asked questions
How wide should a covered walkway be?
Around 2.4 metres suits steady two-way pedestrian traffic, including someone with a pram or luggage. Where the walkway forms part of an accessible route, it must hold a minimum 1200mm clear width under Building Code clause D1 and NZS 4121, measured clear of posts and handrails. Peak-flow areas such as school corridors, bus bays and drop-off zones usually need 3 metres or more.
How wide can a covered walkway span without internal supports?
Up to 6 metres. The PurlinDek® 600 profile spans that distance unsupported on a 75mm rib, so no purlins or mid-run posts are needed within the span. Beyond 6 metres, the design moves to multiple spans with a deliberate support line.
How long can a covered walkway be?
Effectively unlimited. Bay-based structures repeat for the length of the route, which is how a walkway can run the full frontage of a terminal, forecourt or depot.
Can a covered walkway be attached to an existing building?
Yes, and it is common. It needs the existing structure checked for the added load, a fixing into sound structure rather than cladding, and a flashing detail that maintains weathertightness. Where the geometry allows, a free-standing structure alongside the building avoids the connection entirely and is usually the lower-risk option.
Does a covered walkway need building consent in New Zealand?
On a commercial site, assume yes. Schedule 1 of the Building Act exempts some small roofed structures, but a walkway of useful length will normally exceed the size limits, and height or site coverage may also trigger a resource consent. Confirm with the territorial authority early and use the PS1 to support the application.
Can the roof let daylight through?
Yes. Translucent sheeting is available in light-transmission ratings from 47 to 70 percent, UV-stabilised, and is usually specified in selected bays rather than across the whole roof. Weigh it against summer heat gain and rain noise, particularly next to classrooms and consulting rooms.
What is the difference between a covered walkway and a canopy?
In practice, the terms overlap. A covered walkway is a run of cover along a route between two points; a canopy usually describes cover over a single area such as an entry, waiting area or bay. Both are built from the same components, and many projects combine the two.
Can installation be scheduled around a school term break?
Yes, and it should be planned that way from the outset. Consent, fabrication and delivery all have to complete before the break opens, and splitting footings and structure across two breaks is often faster where concrete curing sits on the critical path.