Pergola Guide - How to Choose for Your Garden

Choose a pergola by deciding what it must do before comparing styles. A frame for climbers, a shaded dining space and a weather-sheltered seating area are different projects. Write the job down, measure the usable site and settle the roof, screen and planting requirements before asking what colour the posts should be.

A pergola is normally an open garden structure of posts and overhead beams. Adding a solid or retractable roof, fixed walls, lighting or an attachment to the house can change the structure, foundations, drainage and planning questions, so treat those features as part of the original specification.

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Start with the job

Main use	Design priority	Common oversight
Support climbers	Load, plant vigour and access for pruning	Choosing a climber too heavy for a light kit
Dining or seating	Clear internal space, headroom and route from the house	Measuring the furniture but not chairs pulled out
Summer shade	Sun angle and amount of overhead cover	Assuming an open frame creates dense shade
Privacy	Screen position and effect on neighbours, wind and light	Adding a sail-like solid panel to an under-specified frame
Rain cover	Roof fall, drainage, snow/wind load and watertight junctions	Buying an open pergola and improvising a roof later

Measure the usable space, not the empty patch

Mark the proposed footprint with string or removable tape. Place the intended table, chairs or loungers inside it, then allow for movement, doors, steps, bins, paths and plant growth. Check underground drains and services before placing posts. Look up as well as down: branches, gutters and overhead cables can rule out a position.

Measure from fixed boundaries and note ground levels at every post. A base that appears flat can create visibly uneven beam lines. If a kit gives external dimensions, confirm the clear internal width between posts; chunky members can remove more usable space than expected.

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Choose the basic form

Freestanding

A freestanding pergola can sit where the garden works best and keeps the house junction simpler. It needs a complete set of posts, bracing and foundations, and it must resist wind from every direction. This is often the cleanest choice for a destination seating area or a structure among planting.

Attached

An attached pergola can extend the visual line of the house and reduce the number of posts, but the connection is not a casual DIY detail. The wall material, fixings, damp protection, roof drainage and any insulation or services behind the fixing point need to be understood. Ask a competent installer or designer to specify the connection.

Open, slatted or covered

Widely spaced beams support plants and create broken light; closer slats increase shade. Adjustable louvres and retractable canopies add control but also moving parts, cleaning and maintenance. A permanent solid roof turns rainwater into a drainage problem and may make the proposal look and behave more like an outbuilding or veranda.

Compare materials by ownership, not appearance

Material	Strengths	Questions before buying
Softwood timber	Warm appearance, adaptable and widely available	Treatment, finish schedule, end-grain protection and responsible sourcing
Hardwood	Durable options and refined appearance	Species, certified source, cost, fixings and expected weathering
Powder-coated steel	Slim, strong-looking sections and contemporary finish	Corrosion protection, coating repairs, drainage inside sections and weight
Aluminium	Low routine finishing and relatively light components	Section stiffness, repair options, coating warranty and replacement parts
Composite or mixed kit	Consistent finish and low-maintenance claims	What the core is, colour change, expansion, recyclability and spare-part supply

No material is maintenance-free in every setting. Leaves collect, fixings loosen, coatings are damaged and climbing plants retain moisture. Ask for a written care schedule and decide whether individual components can be repaired or replaced. For timber, an FSC claim should be supported by a valid label or supply-chain documentation rather than a vague sustainability statement.

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Download our PDF worksheet that covers site measurements, usage requirements, planning/foundation checks, materials and shade notes, supplier questions, and a like-for-like quotation comparison.

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Treat foundations and wind as design questions

Post supports fixed to a sound slab, posts set in concrete and purpose-made ground screws can all be appropriate in the right design. Their suitability depends on soil, exposure, drainage, structure size and loads. A decorative spike intended for a small arch is not automatically a foundation for a roofed pergola.

Ask the supplier what wind and snow assumptions the structure was designed for, how it is braced and what base it requires. Extra screens, sails, roofs and mature climbers increase load. If the site is exposed, the structure is large or the design is attached to the house, use a competent designer and installer rather than relying on a generic kit diagram.

Plan shade and climbers together

Observe the summer sun path and decide when shade is needed. A west-facing dining area may need late-afternoon protection; overhead slats aligned without regard to the sun may provide little at that time. Temporary shade cloth can be useful, but it must be compatible with the frame and removed when wind is forecast if the manufacturer requires it.

Choose climbers by eventual height, spread, weight and pruning needs. RHS guidance recommends matching a climber to the available height and width. Vigorous roses, wisteria and vines can become substantial loads, while twining plants may need wires or trellis rather than smooth posts. Leave room at the base for soil, watering and maintenance.

Check permission before placing an order

Planning rules vary across the UK and a pergola does not always fall neatly into one category. In England, some buildings and enclosures within the land around a house can be permitted development if they meet detailed conditions. The England technical guidance includes a 2.5 m total-height limit where any part of a qualifying Class E development is within 2 m of the boundary, but you should not assume that this rule alone decides a pergola proposal.

Contact the local planning authority if there is any doubt, especially for a listed building, designated land, a flat or maisonette, a front or side position, an attached or roofed design, or a property where permitted-development rights may have been removed. Also check title covenants, lease terms and whether work near a shared boundary engages another agreement.

Compare quotations on the same scope

External and clear internal dimensions, total height and post positions.
Material grade, coating or treatment, colour and responsible-sourcing evidence.
Foundation design, ground preparation, drainage and removal of spoil.
Roof, screen, gutter, electrical and planting interfaces, including who supplies each part.
Delivery access, assembly, waste removal, warranty exclusions and maintenance.
Planning responsibility and drawings, where permission or a lawful-development check is needed.

The best pergola is the smallest complete specification that does the intended job safely. Measure the life around it, price the base and aftercare, and resolve permission before paying a deposit. Style then becomes a choice inside sensible constraints rather than a costly correction afterwards.