Pergolas
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A pergola is an open structure of posts and beams, with rafters or a louvred roof overhead and nothing at the sides. In British gardens it does two jobs: it gives a patio or dining area a sense of enclosure without building a room, and it carries climbing plants. The modern aluminium louvred version does a third, shedding rain over a seating area while still letting light through when the blades are open.
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Planning is where pergolas become interesting, because they sit on the line between two ideas. Free-standing in the garden, a pergola is treated as an outbuilding under the householder permitted development rules and has to meet their height and position conditions. Attached to the house, it is arguably an addition to the house and falls to be considered under the extension rules instead, which are different in every one of the four nations. Neither route is difficult, but they are not the same route.
The other thing worth settling early is what the structure is standing on and standing in. A pergola is a large sail in a British gale, and the fixing detail at the base of each post, or into the wall of the house, is what decides whether it is still there in February.
Timber, aluminium, attached and free-standing
- Traditional sawn or planed softwood pergolas, the cheapest form, which rely entirely on preservative treatment and good detailing at the post base.
- Oak and other durable hardwood pergolas, heavier and far more expensive, which weather to silver and are usually left unfinished.
- Aluminium louvred pergolas with adjustable blades and integrated guttering, which behave more like a building product than a garden structure.
- Lean-to pergolas fixed to the house wall on one side and posted on the other, which raise the question of whether they count as an addition to the house.
- Free-standing four-post or six-post structures away from the house, which stay squarely within the outbuilding rules.
- Pergolas over an existing patio or deck, where the fixing has to reach through the surface into something structural rather than bearing on paving.
- Planted pergolas designed for wisteria, vines or roses, which take a substantial live load once mature and need heavier members than a bare frame.
A free-standing pergola under the householder rules
In England, a free-standing pergola is caught by Class E of the Town and Country Planning (General Permitted Development) (England) Order 2015, which covers buildings and enclosures within the curtilage of a dwellinghouse required for a purpose incidental to its enjoyment. Three conditions do most of the work for a pergola. It must not be forward of a wall forming the principal elevation of the original dwellinghouse; it must not exceed 3 metres in height, or 2.5 metres if any part of it is within 2 metres of the boundary of the curtilage; and it must not include the construction or provision of a verandah, balcony or raised platform. That last one is why a pergola built over a raised deck can be a planning application even when the pergola itself is modest.
Wales sets its own figures and one of them catches people out. GOV.WALES guidance says that an outbuilding cannot exceed one storey, that a flat-roofed outbuilding cannot exceed 2.5 metres in height and a single-pitch one 3 metres, that any part within 2 metres of a boundary cannot exceed 2.5 metres, and — the unusual one — that any part of the development within 2 metres of the house cannot exceed 1.5 metres in height. A pergola tucked against the back of a Welsh house is therefore a very different proposition from the same structure a few metres out into the garden.
Scotland handles open garden structures under Class 3B of the 1992 order, described in planning circular 1/2024 as covering building, engineering, installation or other operations in the curtilage not covered by the other classes, including garden works, free-standing solar panels, flag poles, swimming pools and oil tanks. The limits are that the structure is generally to the rear, no more than 3 metres high, and that at least half the relevant front or rear curtilage remains undeveloped — and Class 3B rights do not apply in conservation areas or within the curtilage of a listed building at all. In Northern Ireland, Class D of the 2015 order permits buildings and enclosures within the curtilage but specifically excludes anything consisting of or including a deck, balcony, veranda or other raised platform.
Attached to the house, or on designated land
Fixing a pergola to the house changes the question being asked. Class E is about a building within the curtilage that is incidental to the enjoyment of the dwellinghouse; a structure bolted to the rear elevation and roofed over a patio door can instead be read as an addition to the house, which is assessed under the extension rules with their own limits on projection, height and materials. The safe course is to describe the design to the local planning authority, or to apply for a lawful development certificate, before building rather than after.
Designated land narrows the options everywhere. In England, on article 2(3) land — the National Parks, the Broads, areas of outstanding natural beauty, conservation areas and World Heritage Sites — Class E does not permit anything between a wall forming a side elevation of the dwellinghouse and the boundary, and buildings, enclosures, pools and containers more than 20 metres from any wall of the house are limited to 10 square metres in total. In Scotland, as noted, Class 3B simply does not apply in a conservation area or a listed building's curtilage.
Listed buildings are the firmest restriction of all. In England, Class E does not permit a building, enclosure, pool or container within the curtilage of a listed building, so a pergola at a listed property is a matter for the local planning authority and, depending on the design, for listed building consent as well. The same applies in Northern Ireland under Class D unless listed building consent has already been granted.
Choosing timber that survives outdoors
- Preservative-treated softwood is the standard, and the useful question is what use class the treatment was specified for rather than simply whether it is treated.
- Any cut end or drilled hole in treated timber exposes untreated wood and should be brush-treated with an end-grain preservative on site.
- Naturally durable hardwoods such as oak need no treatment but move, split and stain adjacent materials with tannin as they weather.
- Powder-coated aluminium avoids decay entirely and is the usual choice for louvred systems, but the fixings and brackets still have to be corrosion-resistant.
- Stainless or hot-dip galvanised fixings are worth the extra outdoors, because a mild steel bolt in wet oak will stain and corrode quickly.
- Post bases that hold the timber clear of the ground — a galvanised shoe or a bolt-down base — outlast a post concreted directly into the soil.
- Finishes are maintenance commitments: an oil or stain needs recoating every few years, while leaving timber to silver is a legitimate choice with no upkeep.
Setting a pergola so it survives a British winter
- Check for buried services before digging any post hole, particularly on a route between the house and a garage, shed or outside tap.
- Set out the posts square and check the diagonals, because an open frame shows any error far more than a walled structure does.
- Use post bases that keep timber off the ground, or set posts in concrete with the collar shaped so water drains away rather than towards the timber.
- Design for wind uplift as well as weight, since an open roof frame catches gusts and the connections at the top of each post are what resist them.
- Fix to the house, where that is the design, into masonry with appropriate anchors and never into render or a single skin of blockwork alone.
- Keep any fixing line well clear of the damp-proof course and do not bridge it with a timber plate.
- Allow for the mature weight of planting if climbers are the point, and specify beams sized for it rather than for the bare frame.
- Confirm before building whether the structure will be on land forward of the principal elevation, within 2 metres of a boundary, or over a raised platform.
Keeping a pergola sound
- Check the base of every post each spring, since decay starts at ground level where the timber stays wet longest.
- Retighten bolts and coach screws at the end of the first year, after the timber has shrunk through a heating season.
- Clear leaves and debris from joints and from the tops of beams, where trapped damp rots a frame from above.
- Cut back climbing plants away from joints and fixings rather than letting growth prise a connection apart.
- Recoat oil or stain finishes before they fail visibly, since a weathered surface absorbs far more product and looks patchy.
- Clean the gutters and drainage channels of a louvred aluminium pergola, which block with leaves like any other roof.
- Check louvre mechanisms and seals annually, and note that the moving parts are the component with a service life.
What a pergola quotation depends on, and how LokalMatch fits in
The material is the first fork in the road: a treated softwood frame, an oak frame and a motorised aluminium louvred system are three different price brackets with three different lifespans. After that, the figure moves on size and on ground conditions — how many posts, how deep the bases have to go, whether the structure sits on soil, an existing patio or a deck, whether an existing surface has to be broken out and reinstated, whether the frame is fixed to the house, and how far materials have to be carried from the nearest parking. Anything electrical, such as lighting or a heater, is a separate trade and belongs in the quotation as such.
LokalMatch simply puts you in touch. Set out what you want once with your postcode, including the size, the material you prefer and what the pergola will stand on, and landscapers, carpenters and garden structure installers covering your area will contact you. Using LokalMatch costs homeowners nothing and the businesses pay for the requests they receive. LokalMatch does not build pergolas, does not set prices and does not vet, rank or recommend anyone who replies, so satisfying yourself about the planning position and the fixing details stays with you.
Pergolas: frequently asked questions
Do I need planning permission for a pergola?
In England, a free-standing pergola is usually permitted development under Class E provided it is not forward of a wall forming the principal elevation, does not exceed 3 metres in height, or 2.5 metres where any part is within 2 metres of a boundary, and does not include a verandah, balcony or raised platform. Wales, Scotland and Northern Ireland use their own limits. A pergola within the curtilage of a listed building is not permitted development in England at all.
Is a pergola attached to the house treated differently?
Potentially, yes. Class E covers a building or enclosure within the curtilage that is incidental to the enjoyment of the dwellinghouse. A structure bolted to the rear wall and roofed over a patio door can instead be read as an addition to the house, which is judged under the extension rules with different limits. Because the answer depends on the design, describing it to the local planning authority, or applying for a lawful development certificate, is the safe route.
Can I build a pergola over my raised deck?
Be careful here, because the deck, not the pergola, is usually the problem. Class E in England does not permit development that would include the construction or provision of a verandah, balcony or raised platform, and Northern Ireland's Class D excludes a deck, balcony, veranda or other raised platform in the same way. If the platform beneath already needs permission, adding a pergola over it does not help, so establish the deck's position first.
How tall can a pergola be in Wales?
GOV.WALES guidance limits an outbuilding to one storey, with an eaves height of 2.5 metres, 4 metres overall for a dual-pitched or hipped roof, 3 metres for a single-pitch roof and 2.5 metres for a flat roof, and 2.5 metres for any part within 2 metres of a boundary. Wales adds a condition the other nations do not have: any part of the development within 2 metres of the house cannot exceed 1.5 metres in height, which matters for a pergola built against the back wall.
Do pergolas need building regulations approval?
An open garden structure is not a building in the sense the building regulations are aimed at, and a free-standing pergola will not normally need approval. Fixing a structure to the house, adding a solid roof or enclosing the sides changes that conversation, because at some point what you have is a covered extension rather than a pergola. Any electrical supply for lighting or heating is separate again and belongs to a qualified electrician.
Sources
- The Town and Country Planning (General Permitted Development) (England) Order 2015, Schedule 2 Part 1 Class E
- GOV.WALES: planning permission for outbuildings
- Scottish Government: planning circular 1/2024, householder permitted development rights (Class 3B)
- The Planning (General Permitted Development) Order (Northern Ireland) 2015, Schedule Part 1 Class D
Written by the LokalMatch editorial team. Last reviewed 21 September 2026. How we write and check our guides
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What affects the cost of pergola
Prices depend on the details of your project. We only publish price ranges when they’re backed by real LokalMatch quote data or reliable sources. Until then, here’s what usually changes the price:
- Size and complexity of the piece or structure
- Wood species or material
- Custom design compared with standard sizes
- Hardware, railings and finishing
- Removal of what's there now
- Permits and drawings, where needed
How to compare pergola builders before you hire
- Choose a carpenter whose past work matches your project, whether that's framing, trim, built-ins, stairs or a deck.
- Ask for drawings or a clear description of what will be built, including materials and finishes.
- For decks, stairs and railings, ask whether a permit is needed, since these are safety items.
- Get a written quote that says who supplies materials and whether finishing, such as painting or staining, is included.
- Ask how they'll handle surprises like rot or uneven walls and floors.
Questions to ask pergola builders before you hire
- Can you show me photos of similar work you've done?
- What materials will you use, and why?
- Does this project need a permit, and will you get it?
- Is finishing, such as sanding, painting or staining, included?
- How will you attach the work to the existing structure?
- What warranty do you offer on your workmanship?
Pergola permits and local rules
Some pergola work needs a permit or has to meet local bylaws. Rules vary by municipality, so ask your pro whether a permit is needed and who will apply for it — and check with your city or town if you’re unsure.
Permits and licensingGuides about pergola
- ✦
Carpenters guide
Carpenters and joiners handle most of the timber in a British home. The trade is usually described in two stages.
Read guide - ✦
Trim & Moulding guide
Trim is the joinery that finishes a room rather than holds it up: architrave round the doors, a window board under the cill, dado and picture rails, panel moulding on a wall, plinth blocks, and the beads and stops that…
Read guide - ✦
Coving guide
Crown moulding is the American name for what a British decorator calls coving or, in its more elaborate forms, cornice.
Read guide
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