Home Cinema Room Design Ideas for Dorset Homes

Aug 16

4 min read

A home cinema used to mean a black box with ten recliners in rows and a carpet nobody would choose for anywhere else in the house. Nobody asks for that now. The rooms we're being asked to build around Poole, Broadstone, Wimborne and Canford Cliffs are much quieter about what they are: warm materials, kit you can't see, and a space the family actually sits in on a wet Tuesday rather than saving up for film night.

If you're weighing one up, here's how the design thinking has moved on, where these rooms tend to fit in a typical Dorset house, and what they cost built properly. We do them as part of our premium lifestyle work, alongside spa bathrooms and outdoor living.

Modern home cinema room with ambient lighting and a projection screen, of the kind Complete Builds installs in Dorset and Hampshire homes

The room sets the ceiling, not the kit

Most people come to us having already chosen a projector. We'd rather start with the room. Ceiling height, proportions, which way the joists run, how much daylight you're fighting on a south-facing wall: those decide how big the screen can be, how many speakers make sense, and how much of the budget vanishes into structure before anything gets switched on. No amount of spend on electronics rescues a badly chosen room.

Two things get muddled constantly. Sound isolation keeps the bass out of the bedroom above and keeps the dishwasher out of the film. Acoustic treatment controls how sound behaves inside the room itself. Separate jobs, separate costs. Isolating walls properly, with resilient bars, dense board and sealed perimeters, runs about £55 to £110 per square metre with us depending on the build-up. Ceilings cost more, usually £120 to £145 per square metre, and they eat around 100mm of headroom, which in a lot of 1930s Bournemouth semis is what kills the idea before it starts.

Where these rooms actually go

Very few houses down here have a spare basement, so the honest answer is that almost every cinema room we build is a conversion of something else.

The integral garage. Easily the most common, and usually the best of the options. It's already a rectangle, it has a solid floor, and there are no windows to black out. Converting a single garage of 16 to 18 square metres into a warm, dry, insulated room comes in at £14,000 to £25,000 with us, before any AV kit goes near it.
A loft. Fine where there's genuine headroom under the ridge, but the roof structure and the party wall both need thinking about early rather than halfway through.
A detached garden building. Acoustically this is a gift. You aren't sharing a structure with anyone's bedroom, so isolation gets simpler and cheaper.
A snug off the open-plan kitchen. Not a true cinema, but with proper blinds, a decent screen and a discreet Atmos layout it's the version most families end up using most.

What one costs in 2026

These are our prices, not trade costs, and we survey every job before putting a number on paper. What we find in the floor and the walls moves them.

Media room in an existing space: £12,000 to £24,000. Blackout, sensible acoustic treatment, concealed wiring and power, a good 5.1 layout, a large screen or an entry-level laser projector.
Dedicated cinema room: £30,000 to £60,000. Full isolation, a seating riser, laser projection onto a fixed acoustically transparent screen, 7.1 or Atmos, lighting scenes and bespoke joinery.
Beyond that you're into reference projection and full acoustic design, and the room itself quietly becomes the biggest line on the quote.

Design details worth arguing about

Black has gone. Fabric-wrapped acoustic panels in oatmeal, clay and deep olive do exactly the same acoustic work while leaving you a room you'd happily sit in at two in the afternoon. We're specifying a lot of vertical timber slat over acoustic felt at the moment, oak or walnut, because it tames reflections and reads as joinery rather than treatment.

A single 200mm riser beats full tiering in nearly every UK ceiling height. Two proper rows, everyone sees the screen, and you keep the headroom you'd otherwise give away.

Put the rack somewhere else. A ventilated cupboard on the other side of the wall, or in the utility, keeps fan noise and heat out of the room entirely. We've been called back to more than one job where the amp was sitting in a sealed cabinet behind the seating, cooking itself every summer.

Lighting does more than people expect, and it's the cheapest part of the room. Warm indirect coving on a scene controller, low step lights on the riser, nothing aimed anywhere near the screen. Blackout matters just as much: side channels on the blinds, not a plain roller. Daylight creeping down the edge of a blind wrecks more contrast than any projector spec will win back.

How we run the build

We survey first, always. That means checking the floor construction, the joist direction, where the consumer unit sits and whether it has room for the extra circuits. The structural and first-fix work is ours: framing, isolation, power, data, HDMI runs, heating, plastering and joinery. We set speaker positions and cable routes with your AV specialist before anything gets boarded, because chasing a forgotten cable out of a finished acoustic wall is a bad afternoon for everybody.

A garage conversion cinema room is usually four to six weeks on site. A full dedicated build inside an existing room, six to eight.

Thinking about one?

If you've got a garage you never park in, or a room that's never quite worked, send us the floor plan and a couple of photos. We'll tell you straight whether it's a media room or a proper cinema room job, and what the structure is likely to cost, before anyone starts talking about projectors. Book a survey with Complete Builds and we'll come and measure up across Dorset, Hampshire and Wiltshire.