Orangery vs Extension: Which Is Right for Your Home?
What is the difference?
When adding space to your home, the choice between an orangery and a traditional extension is one of the most significant decisions you will make. Both add floor area. Both are subject to the same permitted development rules. But they are fundamentally different in construction, character, cost and the kind of space they create.
An orangery is a hybrid between an extension and a conservatory — masonry-built with a solid roof perimeter, a central glass lantern, and large glazed windows. It is designed to bring light into a room that functions as a permanent, year-round space. A traditional extension is entirely solid — brick or block walls, tiled or flat roof, and windows that are secondary to the structure rather than integral to it.
The right choice depends on how you want to use the space, how your property is positioned, and what you want the finished room to feel like.
Structural Difference
A traditional extension is built using conventional construction methods — blockwork cavity walls, a pitched or flat roof clad in tiles or felt, and windows positioned as openings within the solid structure. The result is a room that is thermally efficient, visually opaque, and architecturally continuous with the existing house.
An orangery introduces glazing as a primary architectural element. Substantial brick or insulated pillars support a flat solid roof perimeter, at the centre of which sits a glazed roof lantern. The walls incorporate large, floor-to-ceiling glazed sections between the pillars. The lantern brings natural light deep into the space from above, creating a quality of light that a conventional extension — with its side-mounted windows — cannot replicate.
Both structures are built on the same type of foundations and use the same approach to damp proof courses, insulation and floor construction. The difference lies entirely above ground.
Light and Character
The most significant practical difference between an orangery and a traditional extension is the quality of light inside the finished room. A conventional extension depends entirely on windows in the walls for natural light. In a rear extension, this typically means light entering from one direction only — the garden-facing wall.
An orangery’s roof lantern changes this fundamentally. Natural light enters from directly above, illuminating the centre of the room evenly throughout the day, regardless of which direction the extension faces. In Surrey, where many rear gardens face north or north-west, this is a decisive advantage. An orangery facing north can still be a light-filled, airy room. A conventional extension facing north will be comparatively dark for much of the year.
The character of the finished room differs accordingly. A traditional extension can be designed in any style, but it reads architecturally as a solid addition. An orangery reads as a transition between house and garden — solid enough to be a proper room, glazed enough to feel connected to the outside.
Side-by-Side Comparison
| Feature | Traditional Extension | Orangery |
|---|---|---|
| Feature | Traditional Extension | Orangery |
| Roof | Pitched tiles or flat felt/EPDM | Solid flat perimeter with central glass lantern |
| Walls | Solid blockwork cavity walls | Masonry pillars with large glazed sections |
| Natural light | Windows in walls only | Lantern roof plus wall glazing — light from above |
| Thermal performance | Excellent if well insulated | Excellent — warm deck roof as standard |
| Character | Solid room, architecturally opaque | Light-filled, transition between house and garden |
| Planning | Permitted development (subject to limits) | Permitted development (same rules apply) |
| Typical cost | £20,000 – £50,000+ depending on spec | £30,000 upwards depending on size and spec |
| Property value uplift | Typically 5–10% | Typically 10–15% |
Planning and Permitted Development
For planning purposes, an orangery and a traditional extension are treated identically. Both are classified as single-storey extensions under the Town and Country Planning (General Permitted Development) (England) Order. The same size limits, height restrictions and boundary setback rules apply to both.
For most detached properties in Surrey, this means an orangery can be built under permitted development without a planning application, provided it does not extend beyond the rear wall by more than 4 metres, does not exceed 4 metres in height, and does not cover more than 50% of the garden area.
Surrey has a significant number of conservation areas, listed buildings and Article 4 Direction areas where permitted development rights are restricted. Surrey Orangery assesses planning eligibility on every project and manages applications where required. We also recommend obtaining a Lawful Development Certificate from your local authority — Guildford Borough Council, Elmbridge Borough Council, Mole Valley District Council or Waverley Borough Council — to provide permanent legal documentation of compliance.
Cost Comparison
A basic single-storey brick extension in Surrey typically starts from £20,000 to £30,000 for a modest, standard-specification structure. Costs rise significantly with size, finish quality, glazing, underfloor heating and kitchen or bi-fold door specification — a well-specified extension of 25–30 square metres will often reach £50,000 or more.
An orangery starts from £30,000 and reflects the additional complexity of the lantern roof structure, bespoke glazing, and solid masonry pillars. The premium over a basic extension narrows as specification increases, and the orangery’s greater property value uplift — typically 10–15% versus 5–10% for a conventional extension — means the net financial case is often comparable or better.
For a Surrey property valued at £700,000, the difference between 10% and 15% property value uplift represents £35,000. In that context, the additional cost of choosing an orangery over a conventional extension frequently pays for itself on sale.
Which Is Right for Your Surrey Home?
A traditional extension is the right choice when you need maximum enclosed floor area at the most economical cost, when the architectural style of the property requires a fully solid structure, or when planning constraints limit the height or mass of any glazed element.
An orangery is the right choice when natural light is a priority, when you want a room that feels architecturally special rather than simply larger, and when you want the new space to add lasting value to the property. For period properties — Victorian, Edwardian, Georgian — an orangery’s masonry pillars and lantern roof are architecturally sympathetic in a way that a flat-roofed extension rarely is.
For Surrey homeowners in Guildford, Cobham, Weybridge, Esher, Oxshott and the surrounding villages — where properties are typically substantial, period or character homes — an orangery is almost always the stronger long-term choice.
Frequently Asked Questions
Is an orangery classed as an extension?
An orangery occupies the same planning classification as a traditional extension — both are single-storey rear extensions under permitted development rules. The difference is structural and aesthetic, not legal.
Does an orangery add more value than an extension?
An orangery typically adds comparable or greater value than a standard extension, particularly in Surrey where buyers place a premium on light, design quality and architectural detail. A well-built orangery is appraised as a permanent room, not an addition.
Which is cheaper — an orangery or an extension?
A basic brick extension can be less expensive than an orangery of equivalent size, but the gap narrows with quality finishes and specification. An orangery’s thermal performance and property value uplift typically make it the stronger long-term investment.
Can an orangery be used as a kitchen extension?
Yes. A kitchen orangery extension is one of the most popular applications — the lantern roof brings natural light into the cooking and dining space, while solid masonry walls provide the thermal performance required for year-round use.
