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A cedar-clad Sandringham with its doors open to a bright lounge, beside a tree swing

The Sandringham

A garden room built like a home

Triple glazed, fully insulated and air conditioned as standard. First shown at the RHS Chelsea Flower Show, and handmade in Oxfordshire.

Design your SandringhamSee it in person
£30,700From, inc. VAT
4m × 3m to 10m × 5mOr any size made to order
10-year guaranteeDelivery and installation included
5.0 on TrustpilotFrom 348 reviews

A room for the garden that feels like part of the house

Closer to residential construction than a typical garden building, with the specification others offer as upgrades included as standard. Designed by architects and engineers, installed by our own teams.

£30,700From, including VAT. Or from £305 a month on the 10-Year Plan (8.9% APR representative). Subject to status.
4m × 3m to 10m × 5mEvery half metre, or any size made to order
Triple glazedDark grey aluminium doors and windows
10-year guaranteeRot, decay and structure

Design your Sandringham

Choose a size, package, roof, doors and interior. Anything tailored is priced by your designer.

Explore more options in 3D (opens in a new tab)

SIZE

Width
Depth

PACKAGE

ROOF

DOORS

INTERIOR

    Tailor it with a designer

    Professional or Premium

    Two complete specifications, both installed, both ready to tailor. Premium adds an engineered oak floor, painted plasterboard walls and Thermowood cladding.

    ProfessionalFrom £30,700PremiumFrom £36,550
    FlooringSPC, made for heavy footfall: Ash Grey, Walnut Brown or Graphite GreyEngineered oak, matt lacquered: Light Grey, Walnut or Natural Oak
    Internal wallsWhite wash redwood claddingPainted plasterboard, Dulux white
    External claddingRedwood 18 × 95mm, Sikkens 771 with UV filtersThermowood 20 × 118mm T&G, Sikkens 771
    ElectricsInternal fuse box, 1-gang switch, white fittingsExternal consumer unit, dimmer switch, brushed stainless fittings
    Heating & coolingSmart air conditioning: cooling, heating and dehumidifyingSmart air conditioning, or an Adax NEO panel heater
    Insulation (timber frame)Floor Thinsulate foil, ceiling 100mm, walls 75mm RockwoolFloor 90mm Celotex, ceiling 100mm, walls 100mm Rockwool

    Both packages include doors, delivery, installation, the full standard specification and our 10-year guarantee. Groundworks are quoted after an optional £460 site survey (inc. VAT).

    Included as standard

    Triple glazingSuperior thermal performance
    Smart air conditioningCooling, heating and dehumidifying
    Aluminium doors and windowsDark grey, triple glazed
    High-performance insulation150 to 280mm build-up
    Architect and engineer designedBuilt to TRADA standards
    Certified timberFSC/PEFC Northern European Redwood
    Full electrics and lightingPre-wired, quality fittings
    10-year guaranteeRot, decay and structure
    A Sandringham garden room

    Tailored, element by element

    Every part of the Sandringham can be customised, or made bespoke to order. Your designer shapes it with you, then prices it.

    Doors
    French, sliding or bi-fold, with the standard set chosen to suit the width.
    Roof and skylights
    A single-piece EPDM flat roof, or a pitched cedar roof, with skylights sized and placed for the room.
    Construction
    Structurally engineered SIPs, or a traditional timber stud frame.
    Regulations and annexes
    Can be specified to meet Building Regulations, and adapted into an annexe.

    Explore bespoke

    5.0

    Excellent, from 348 reviews

    Read them on Trustpilot (opens in a new tab)

    “An absolutely brilliant company who provided a first class service. The garden room is absolutely stunning.”Verified customer, Feb 2026. A bespoke Sandringham for a gym and rehearsal studio
    “Opting for the Crown Sandringham turned out to be an excellent decision. It has truly transformed our space.”Customer, Jan 2026
    “Quick, friendly, informative, and cleaned up after them. The installation was excellent.”Verified customer, Nov 2025

    Sandringham questions

    What sizes does it come in?

    From 4m × 3m to 10m × 5m in half-metre steps. Other dimensions are available through our bespoke service.

    Professional or Premium?

    Both are complete and installed. Premium adds an engineered oak floor, painted plasterboard, Thermowood cladding, an external consumer unit, dimmer switching, brushed stainless fittings and upgraded insulation in timber-frame builds.

    Which doors can I have?

    French, sliding or bi-fold. Standard: French doors 2m × 2m at 4m wide; bi-folds ×3 at 4.5 to 7m; ×4 at 7.5 to 8.5m; ×5 at 9 to 10m.

    Will I need a base?

    Yes, a concrete base or ground screws. An optional site survey (£460 inc. VAT) recommends the right one, and we quote it separately.

    Do I need planning permission?

    It is designed to comply with permitted development in most cases. Sleeping or living in it needs planning permission. Planning guide

    Is installation included?

    Yes. Delivery and installation by our own specialist teams are included in both packages.

    See the Sandringham in person

    Six show sites, open seven days. A design consultant will talk through sizes, packages and anything you would like to tailor.

    Book a visit   Request a brochure

    Prefer to talk? 01491 612820

    Your SandringhamDesign yours