West Elm · Sofas
West Elm Harmony 3-Piece Chaise Modular Sofa Assembly in London
The West Elm Harmony 3-Piece Chaise Modular Sofa is a 2-seater, a corner and an ottoman, 310 cm across and 218 cm deep once joined. The three boxes weigh up to about 95 kg, and the pieces only look right when they are level and locked together. A vetted JACK pro sets it up in London for a fixed price before you book.
In short
Yes. JACK pros in London assemble the West Elm Harmony 3-Piece Chaise Modular Sofa: legs fitted, the three modules lined up, levelled and joined with any connectors supplied so they do not drift apart. West Elm lists Home Delivery & Assembly on it; book JACK when yours came without it or after a move.
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Start a JACK request
Native app
Start the request here, then add extra photos or videos from the JACK app if the pro needs more detail.
Harmony 3-Piece Chaise Modular Sofa: key facts
- Built size
- 310 cm wide × 218 cm deep × 94 cm high; seats 3–4
- Pieces
- 2-seater 201 × 109 cm (59 kg), corner 109 × 109 cm (27 kg), ottoman 109 × 109 × 51 cm (31 kg)
- How it arrives
- Three boxes: 89 × 112 × 249 cm (about 95 kg), 89 × 112 × 119 cm (about 36 kg), 107 × 107 × 64 cm (about 45 kg)
- West Elm delivery
- Listed with Home Delivery & Assembly: West Elm's team can build it on delivery day where the service covers your area
Sizes, boxes and weights come from West Elm UK's public product listing. West Elm can change a design or its packaging, so check your own order confirmation, and send it with your request. Last checked 26 October 2026.
How the Harmony 3-Piece Chaise Modular Sofa arrives
The longest Harmony box is 2.49 metres, for the 2-seater. In a period conversion or a flat with a tight stair turn, that box is the one to measure for.
Modular pieces have to sit tight and level with each other. If they are not, the seam shows and the pieces can creep apart when people sit at the join.
What the pro does on the Harmony 3-Piece Chaise Modular Sofa
- Each module unboxed in the room and its legs fitted
- Modules arranged in your layout, levelled to each other
- Joined with any connectors supplied
- Cushions set and the seams checked
Before you book: what to send
- Your layout: which side the chaise or ottoman goes
- Door and stair widths against the 2.49 m box
- Floor type
How West Elm assembly is priced
A vetted pro prices your piece from the product link and a photo of the room, and the JACK app shows you that fixed price before you book.
The design moves the price far more than the size. A side table with screw-in legs is a short job. A solid-wood bed with a slatted base, a six-drawer dresser with runners to align, or a sectional sofa whose pieces clip together is a much longer one. Send the product link or a screenshot of the order so the price is for the piece you bought.
Several pieces from one delivery, such as a bed, two nightstands and a dresser, go on one booking for one price. Pieces from other shops can go on the same visit. Where parking has to be paid for, it is added at cost and agreed before you book.
Prefer to pay for the pro's time? Hourly hire works too: as a guide, furniture assembly is typically £35–£75 per hour. For a big delivery, a full-day handyman booking often suits: a flat £350–£400 for up to 8 hours on site.
How it works
Step 1
Share the piece and the room
Paste the West Elm product link or a screenshot of your order (not delivered yet? the link is enough to price from) and add a photo of the room. Mention stairs, a lift or a tight turn on the landing.
Step 2
See the price, pick a slot
A vetted pro prices the build from what you sent. Book once you are happy with the price, choosing a slot after your delivery date; evenings and weekends are available when pros have them.
Step 3
Built, checked, handed over
Parts are counted first, the piece is built and levelled, drawers and doors adjusted, tall pieces anchored and the packaging flattened for recycling. You follow it all in the JACK app.
Frequently asked questions
Can a Harmony sectional be rearranged later?
Yes, within limits. Modules can be separated and moved, but the 2-seater is sold as a left-arm or right-arm piece, so moving the chaise to the other side needs the opposite-arm sofa. A pro can rearrange and re-level the pieces if you would rather not lift them.
How much does it cost to have a West Elm Harmony 3-Piece Chaise Modular Sofa assembled in London?
It is a fixed price for your Harmony 3-Piece Chaise Modular Sofa, worked out by a vetted pro from the product link and a photo of the room, and shown in the JACK app before you book. If you would rather pay for time, hourly hire is typically £35–£75 per hour as a guide, and a full day is a flat £350–£400 for up to 8 hours on site.
Often booked together
Harmony Modular Sofa assembly
The 208 cm Harmony sofa: a 102 kg box, removable legs and the doorway measurement that matters.
Mid-Century Media Console assembly
The Mid-Century media console in four widths, levelled, with the TV wall-mounted on the same visit.
Portside Outdoor Sectional assembly
The 246 cm Portside L-shaped garden sofa: three boxes, built and levelled outdoors.
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All West Elm assembly guides
West Elm furniture assembly in London: beds, sofas, dressers, media consoles and curtains put together by vetted local pros. Fixed price before you book.
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Jack All Trades (JACK) is an independent London service. It is not part of, affiliated with or endorsed by West Elm or Williams-Sonoma, Inc. West Elm product and collection names are used only to describe the furniture pros put together, and prices are set by JACK pros, not by West Elm.
Get your West Elm furniture built
Send the product link and a photo of the room in the JACK app, see a fixed price from a vetted local pro, and pick a time that suits you.
Get a fixed price in the app