Buying Guide

How to Choose the Right Size Veranda

The two numbers that matter more than the colour, the roof, or the brochure — and how to get them right before the surveyor turns up

Posted 20 April 2026

Most people arrive at the veranda-buying process thinking about colour, roof material, and which model looks best in the brochure. All of that matters. But the single decision that determines whether a veranda gets used every week or sits unused by October isn't any of those things. It's size.

Get the size right and a veranda becomes a genuine extra room — the place you eat breakfast in May, work from in July, and entertain under in September. Get it wrong and you've got a handsome structure that's too tight for the dining table you already own, or a roof so wide it visually swallows the back of the house.

After ten years of installing verandas, the conversation I have most often with customers is about going a little bigger than they first thought. Almost no one comes back to say their veranda ended up too large. A surprising number wish they'd added another 500mm of depth. This guide is about why, and how to avoid it.

The Two Numbers: Depth and Span

Every veranda comes down to two dimensions.

Depth is the distance the veranda projects out from the house — how far it sticks out into the garden. This is the number that determines what you can fit under it. A dining table, a sofa, a hot tub, a home-office desk — they all need depth.

Span is the distance the veranda runs along the house wall — how wide it is. Span determines how many zones you can create side by side. A single seating area needs three or four metres of span. A seating zone next to a dining zone needs six or seven.

These two numbers work together. A veranda that's 4 metres deep but only 3 metres wide feels tall and narrow, almost like a porch. A veranda that's 6 metres wide but only 2.5 metres deep feels shallow — there's width but not much you can do with it. A balanced footprint is what gives you a usable outdoor room.

Start With What You'll Do Under It

Before you start thinking in metres, think in activities. The most common mistake is sizing a veranda against the garden rather than against the life that's actually going to happen under it. The best way to get to the right number is to list what you want to do, and then work backwards to a footprint that fits.

Below are the footprints we recommend for the ways customers most commonly use their verandas. These are sensible minimums — comfortable rather than cramped. Add 500mm in either direction if you want real breathing room.

Then Check the Physical Constraints

Once you have a use-led target size, the next step is matching it against what's actually possible on your house and in your garden. Four things to measure before you commit.

1. Garden depth

A veranda shouldn't dominate the garden it sits in. A useful rule of thumb: the veranda should take up no more than around a third of the usable garden depth behind the house. If you have 12 metres of lawn between the back door and the fence, a 4 metre deep veranda is perfectly balanced. A 6 metre deep one would start to squeeze the rest of the space.

This isn't a hard rule — some customers want a veranda that covers most of a small courtyard, and that works too. But if the garden is going to feel shrunken afterwards, you'll notice it every day.

2. House height

A veranda needs to attach to the house somewhere. Usually that's the fascia or the wall just below it, on the rear elevation. Because the roof pitches forward at a fixed angle — typically around 8 degrees — to drain rainwater to the front gutter, the front edge always sits lower than the rear fixing.

Posts arrive from the factory in 2.5 metre or 3 metre standard lengths and are cut to size on site. The typical finished front-edge height, measured from the paving to the underside of the gutter, lands between 2.1 and 2.5 metres. The rear fixing is usually between 2.9 and 3.1 metres above the paving, depending on the depth of the veranda. Less than 2.1 metres at the front and taller people start to notice the beam; more than 2.5 metres and the rear fixing is often interfering with a first-floor windowsill. A good surveyor will walk you through the options on your specific elevation.

3. Door access

Whatever you step out of — bifolds, a sliding patio door, French doors — needs to open freely into the covered area. Bifolds fold outwards and need around 300mm of clearance to stack against the wall. Sliders don't project but the handle still needs breathing room. Plan the veranda position so the door hardware doesn't hit a post.

4. Boundaries and drainage

A veranda within two metres of a boundary has a slightly tighter planning permission threshold (the eaves height drops to 2.5 metres). Most verandas sit well inside that anyway, but it's worth knowing. Drainage needs a home — the integral gutter has to discharge somewhere, usually into an existing downpipe or a new soakaway. If there's a manhole cover where you want the front posts, that's worth flagging early. None of these are dealbreakers — they just shape the final layout.

What Our Models Actually Allow

Every veranda in the range has a practical maximum. Below are the maximum depths and spans we can engineer without splitting the roof into multiple bays. Most installations sit well inside these numbers — but it's useful to know where the ceiling is when you're planning.

A few things worth noting from the table. The Horizon has the widest span in the range — useful if you want a single unbroken roofline across a long rear elevation. The Haven has the smallest maximum depth because it's engineered for precision and a long life rather than maximum footprint. Most British-made models (Haven, Pavilion, Vista) are available in 500mm increments, so you can specify something like a 3.5 metre depth rather than being forced to round up to 4.

The Mistakes We See Most Often

Going too small out of caution

This is the single most common regret. Customers sometimes worry that a larger veranda will look imposing from the garden, so they size down — only to find when it's installed that it disappears into the architecture of the house and feels surprisingly compact. A veranda at 4 metres deep rarely looks too big in person. Many at 3 metres end up feeling slightly undersized.

Running the span the full width of the house

It's tempting to centre a veranda on the whole rear elevation. Sometimes that's right — on a wide modern house with continuous bifolds, a long span is often the cleanest look. But on most older UK homes, a veranda looks more elegant when it's centred on a specific zone — the kitchen doors, or the patio area — with brickwork or rendered wall either side.

Forgetting the sun's arc

The shadow cast by a veranda is longer at the start and end of the day, and much shorter in summer. A deeper veranda gives you more shade at midday — useful for a south-facing garden in July. A shallower one lets more winter sun reach the house windows — useful for heating and natural light in January. Both are preferences, not right-or-wrong decisions; just worth thinking about before you lock in the depth.

Not testing the footprint on the ground

Before you sign anything, mark the veranda footprint on your patio or lawn with masking tape, chalk, or a garden hose laid in a rectangle. Put your actual outdoor furniture inside the outline. Sit at the table. Walk around it. Ten minutes of this is worth more than any amount of scale-drawing — you'll know immediately whether the size you've picked works, and almost every customer who does this ends up nudging the dimensions outwards by 200–500mm.

A Simple Way to Arrive at the Right Size

If the whole decision feels abstract, here's a four-step sequence that lands most customers on a sensible answer in about twenty minutes.

• Write down the three things you most want the veranda to do. Dining? Working from home? A hot tub? Put these in priority order.
• Pick the footprint from the use-case list above that matches your top priority — then add 500mm to whichever dimension feels tightest.
• Tape out the footprint on the paving or lawn and put real furniture inside it.
• Check it against the constraints — garden depth, house height, door position, boundaries. Adjust if needed.

That's almost always enough to arrive at a size you'll still be happy with five years later. Everything after that — model, roof, colour, doors, lighting — is easier once the footprint is settled.

Frequently Asked Questions