How to Price an Orangery: Labour, Materials and Margin Guide

Summary

Orangeries sit in the price gap between a conservatory and a full extension, and pricing them wrong in either direction loses money or loses the job. Quote it like a conservatory and you undercost the groundworks, masonry, warm-roof build-up, and lantern by £8,000–£15,000. Quote it like a plain extension and you undercost the lantern glazing package, which is typically the single most expensive line item on the job — often £3,000–£8,000 for the lantern alone before installation labour.

The defining technical fact, covered in depth in orangery vs conservatory, is that an orangery does not meet the Schedule 2 Class VII conservatory exemption: the roof is more than 25% solid and the walls are substantially masonry, so full Building Regulations apply, including Part L1B fabric standards. That single regulatory fact drives the entire cost structure — structural foundations, insulated warm roof, thermally-broken lantern glazing, and Building Control fees that a true conservatory never sees.

This guide breaks the orangery down by trade and by material component, so you can build a bottom-up price rather than working from a rule-of-thumb £/m² figure that doesn't survive contact with a site with awkward access, a steep roof pitch match, or a client wanting a 3m bifold set. It assumes you are pricing as a main contractor coordinating subcontract trades — the same structure applies if you're pricing your own labour-only portion within someone else's job.

Key Facts

• Regulatory status — orangery = full Building Regulations extension (Parts A, B, F, L1B, P); no Schedule 2 Class VII exemption available in almost all cases
• Part L1B fabric standards — roof U ≤0.16 W/m²K, wall U ≤0.18 W/m²K, floor U ≤0.18 W/m²K, glazing/lantern U ≤1.4 W/m²K
• Typical floor area — 15–20m² small orangery, 20–35m² larger family-room orangery
• Programme — 8–14 weeks from groundworks to handover for a typical domestic orangery, longer than a conservatory's 2–6 weeks
• Foundation depth — full strip foundation, 750mm–1,000mm minimum (deeper on clay or near trees per NHBC 4.2), not a shallow conservatory dwarf-wall footing
• Lantern roof — kerb-mounted glazed lantern over a solid insulated flat roof perimeter; lantern typically 1.5m × 1.5m to 3.0m × 2.0m
• Lantern glazing spec — double or triple glazed, argon-filled, low-E coated, warm-edge spacer, thermally-broken aluminium frame (PA66 polyamide break)
• Frame material for wall glazing — aluminium bifold/slide sets increasingly standard over UPVC French doors on orangeries; premium look expected at this price point
• VAT — standard-rated 20%; no reduced rate applies to a domestic orangery
• Building Control fees — £450–£950 for a Full Plans or Building Notice application, plus site inspections
• Structural calculations — required for the roof opening and any steel ring beam or lintel supporting the lantern upstand; £400–£900 for a structural engineer's package
• Planning permission — usually permitted development (GPDO 2015 Schedule 2 Part 1 Class A), subject to the same 3m/4m rear projection and height limits as any extension
• Trades involved — groundworker, bricklayer, carpenter/roofer, specialist lantern/glazing installer, electrician, plasterer, decorator; more trade handovers than a conservatory
• Warranty exposure — as a full extension, workmanship warranty expectations (structural, roof, glazing) are higher than a supply-and-fit conservatory package — factor this into margin
• Margin — 18–25% gross on labour and materials combined is standard for a bespoke-build orangery; lower than a packaged conservatory's 20–30% because more of the value is subcontracted specialist work with thinner onward margin available

Quick Reference Table

Detailed Guidance

Building the price bottom-up: labour by trade

Pricing an orangery as a single blended day rate produces wildly inconsistent quotes because the trade mix is unusually broad for a single-room addition. Build the labour line separately for each trade:

• Groundworker — foundation excavation, drainage diversion if needed, oversite prep. Typically 3–5 days for an 18–20m² orangery footprint. Day rate £180–£280.
• Bricklayer — foundation-up masonry, cavity walls, brick-matching to the host property. 6–10 days depending on wall height and glazing openings. Day rate £200–£300 for a lead bricklayer, £150–£200 for a labourer.
• Roofer/carpenter (warm roof) — deck, joists, VCL, insulation, single-ply or GRP membrane around the lantern kerb. 3–5 days. Day rate £220–£320.
• Specialist lantern/glazing installer — often subcontracted separately from the general glazing supplier; some suppliers include install in the supply price, others charge separately. 1–2 days for the lantern, £600–£1,400 typically quoted as a package rather than a day rate.
• Aluminium bifold/window installer — 1–2 days for a typical 3m bifold set, often included in the glazing supply-and-fit package.
• Electrician — first fix during build, second fix at finish. Half-day to 1 day, £35–£55/hour or £250–£450 as a fixed package for a standard sockets-and-lighting spec.
• Plasterer — internal wall finish once glazing and first-fix electrics are done. 2–3 days for 18–20m² of wall area.
• Decorator — final finish, 1–2 days.

Sum these against your actual programme, not a generic "extension day rate" — the lantern and specialist glazing trades in particular are quoted as fixed packages by their suppliers, not day-rated, and need to be captured as separate line items.

The lantern — the single biggest line item

The lantern is where most orangery quotes go wrong, in both directions. A basic 2m × 2m thermally-broken aluminium lantern with double glazing supplied by a mainstream UK glazing manufacturer runs £2,200–£3,200 supply-only. Upgrade to triple glazing, solar control coating, or a larger format (3m × 2m+) and the price climbs to £4,500–£5,500 supply-only before installation.

Get a firm supply quote from the glazing manufacturer before pricing the job — do not estimate this component. Lantern pricing varies far more between suppliers than standard window/door pricing, and a wrong guess here is the most common cause of an orangery quote being significantly under or over the market.

Installation (kerb construction, upstand, flashing detail, internal plaster reveal, sealing) is a separate £600–£1,400 depending on roof height and access — factor scaffold/tower hire if the lantern sits above single-storey reach.

Materials — where cost differs from a standard extension

Beyond the lantern, three material categories push the orangery above standard extension pricing:

1. Warm roof insulation spec — to hit the Part L1B roof U-value of ≤0.16 W/m²K, expect 150–200mm PIR insulation in the warm roof build-up, materially more than a basic flat-roof extension might use if not glazing-adjacent. £180–£280/m² for the full deck-to-membrane build-up.
2. Glazing package — aluminium framing throughout (lantern, bifolds, feature windows) is the default expectation at this price point; UPVC substitution saves 20–30% on the glazing line but undermines the premium positioning most orangery clients are paying for.
3. Brick/block matching — orangeries typically have more masonry wall area than a fully-glazed conservatory, so brick-matching cost and lead time (sourcing a matching brick, 2–6 weeks) is a real line item — see brick matching.

Margin and markup structure

Build the quote as: direct labour + materials + subcontract packages (lantern, glazing) = cost base. Add:

• Preliminaries — 8–12% (site welfare, skip, scaffold/access equipment, insurance)
• Contingency — 5–8% (higher than a conservatory because more is opened up once foundations are dug — unknown drainage runs, tree roots, ground conditions)
• Margin — 18–25% gross on the full cost base

A worked example for an 18m² orangery:

• Groundworks + foundations: £3,200
• Masonry (walls, brick-matched): £6,800
• Warm roof build-up: £4,200
• Lantern (supply £3,000 + install £900): £3,900
• Wall glazing/bifolds (3m set): £6,500
• Structural steel + engineer calcs: £2,100
• Electrical: £900
• Heating extension: £1,200
• Plastering + decoration: £2,000
• Building Control fees: £700
• Cost subtotal: £31,500
• Preliminaries (10%): £3,150
• Contingency (6%): £2,079
• Cost base: £36,729
• Margin (20%): £7,346
• Net price (cost + margin): £44,075
• VAT (20%): £8,815
• Quoted price: £52,890 inc. VAT (approximately £2,938/m²)

Where clients try to reclassify to save money

Clients will frequently ask whether the room "counts as a conservatory" to avoid Building Regs fees and the associated cost. Be direct: if the roof has more than 25% solid area and the walls are more than 50% masonry, it is not exempt, regardless of what it's called on the plans. Quoting (or building) an orangery under the conservatory exemption to save the client money exposes both of you to enforcement action and invalidates any future sale disclosure — see building regulations exemptions for the exemption boundaries in full.

Frequently Asked Questions

Why is an orangery so much more expensive than a conservatory per square metre?

Because it's a different regulatory category, not just a different look. A conservatory under the Class VII exemption has no Part L requirement, a shallow dwarf-wall foundation, and typically a single glazing supplier handling the whole superstructure. An orangery needs full-depth foundations, masonry walls, an insulated warm roof to Part L1B standard, structural calculations for the lantern opening, and Building Control sign-off — each of those is a separate cost line a conservatory doesn't carry.

Can I price the lantern as part of a generic glazing day rate?

No. Lantern units are supplied as manufactured packages by specialist glazing companies, priced per unit not per day, and the price varies significantly with size, glazing spec (double vs triple), and frame finish. Get a firm supply quote before finalising the job price — this is the line item most likely to make or break your margin if estimated rather than quoted.

Does the client need an architect or will a technician's drawings do?

For most domestic orangeries, an architectural technician's drawings are sufficient for Building Regs submission, provided they cover foundations, structure, U-values and the glazing schedule. Full architect involvement is typically reserved for high-end designs or where the orangery integrates with wider remodelling — see orangery vs conservatory for more detail.

What's the biggest margin risk on an orangery job?

Ground conditions discovered once foundations are dug — unexpected drainage runs, tree roots requiring root barriers, or soft/made ground requiring a deeper or wider foundation than surveyed. This is why contingency should run 5–8% rather than the 5% typical on a conservatory, where the base build is shallower and less variable.

Should I subcontract the lantern install or do it in-house?

Unless your team fits lanterns regularly, subcontract to the glazing supplier's install team or a specialist. The upstand, flashing and sealing detail around a lantern is a common source of leaks if done by a general builder unfamiliar with the specific kerb system — a leak here is expensive to trace once the internal plaster and decoration is complete.

Regulations & Standards

• Building Regulations 2010, Parts A, B, F, L1B, P — full compliance required (no Schedule 2 Class VII exemption)

• Approved Document L1B (2021) — roof U ≤0.16 W/m²K, wall U ≤0.18 W/m²K, glazing/roof lights U ≤1.4 W/m²K

• Approved Document K — protection from falling and safety glazing in critical locations

• BS EN 12600:2002 — pendulum impact test for safety glazing

• BS EN 12150-1 — thermally toughened safety glass

• The Town and Country Planning (General Permitted Development) (England) Order 2015, Schedule 2 Part 1 Class A — permitted development limits

• NHBC Standards Chapter 4.2 — foundation depths near trees on shrinkable clay

• Planning Portal — Extensions

• GOV.UK — Approved Document L1B

• LABC — Building Control guidance

• Building Regulations 2010 Schedule 2

• VAT Notice 708

• orangery vs conservatory — the regulatory distinction that drives this pricing

• conservatory pricing guide — pricing for true exempt conservatories, for comparison

• house extension pricing guide — base extension £/m² rates this guide builds on

• brick matching — sourcing matching brick for the masonry walls