Skip to main content
Trusted Loft Conversions
En-suite bathroom in a loft conversion
Master Bedroom with Private Bathroom

En-Suite Loft Conversion Specialists

An en-suite loft conversion costs between £28,000 and £50,000 in the UK, combining a bedroom and private bathroom in the converted loft space.

Create a complete master bedroom suite with a private en-suite bathroom in your loft. We handle every trade in-house: structure, plumbing, drainage, waterproofing, tiling, and design. That means one fixed price and one point of contact.

From £28,000
Timescale: 8–12 weeks

FREE NO-OBLIGATION ESTIMATE

Get Your Free Estimate

What is an En-Suite Loft Conversion?

An en-suite loft conversion creates both a bedroom and a private bathroom within the same loft space. In practice, it combines the structure of a standard loft conversion with the extra work of routing plumbing, drainage, and electrics to a wet room at roof level. That added complexity is exactly what our specialist team is built to handle.

The extra value of an en-suite over a bedroom alone is well documented. A master bedroom with a private shower room sits among the top five features buyers say they want. As a result, the combination usually adds more to the sale price than the two parts would on their own. It is both a lifestyle upgrade and a sound financial decision.

We manage the whole project in-house, from structural engineering and dormer design through to plumbing, drainage, tiling, and final decoration. You never have to coordinate separate contractors yourself. Instead, one project manager oversees every stage and keeps you informed throughout the build.

Key Benefits of an En-Suite Loft Conversion

Complete Master Suite

Bedroom and private bathroom in one conversion — no sharing, no waiting for the family bathroom.

Maximum Added Value

A bedroom plus en-suite adds significantly more to property value than a bedroom alone.

Single Contractor

We handle all trades in-house — no need to find and coordinate separate plumbers or electricians.

Design-Led Approach

Our designers work around sloped ceilings and limited headroom to create beautiful, functional bathrooms.

Is an En-Suite Loft Conversion Right for My Home?

An en-suite conversion needs a little more loft floor area than a bedroom alone, because the bathroom takes up space too. Most homes still qualify comfortably. To check, run through these criteria:

  • Sufficient loft floor area for both a bedroom and a bathroom (typically 20 m²+ minimum)
  • Ridge height of at least 2.5 m above existing joists
  • Dormer or mansard conversion recommended for the best headroom and floor space
  • Existing soil stack accessible for drainage connection (we assess on survey)
  • Mains water supply and hot water system adequate for additional bathroom
  • Building regulations compliance throughout — we design to meet Part A, B, F, G, L, and P

What's Included in Every En-Suite Loft Conversion

Free site survey and drainage feasibility assessment
Architectural drawings and building regs application
Structural calculations for floor and roof
All plumbing — hot, cold, and drainage routing
Full bathroom layout design
Waterproofing (tanking) to all wet areas
Ceramic or porcelain floor and wall tiling
Shower enclosure, WC, and vanity basin supply and fit
Mechanical extract ventilation (Part F compliant)
Electrical installation including lighting and shaver point
New staircase, fire doors, and mains smoke alarms
Building regulations sign-off certificate

Typical Cost and Timescale

Cost Guide

From £28,000

This includes all structural, plumbing, tiling, and electrical work. The final cost then depends on your en-suite specification, the bathroom fittings you choose, and the type of conversion. You get a fixed-price quote after the free survey.

Build Programme

8–12 weeks

The extra plumbing and tiling phases add a little time over a bedroom-only conversion. Even so, our project manager coordinates every trade to keep the build on schedule.

Frequently Asked Questions

How is plumbing routed to a loft en-suite bathroom?
We route a loft en-suite by feeding cold water from your existing cold supply, hot water from your cylinder or a dedicated electric shower, and waste down to the main soil stack. The pipe runs are longer than a ground-floor bathroom, so we plan the drainage falls carefully. Where gravity drainage works, waste discharges straight into the existing soil stack. Where it does not, we fit a macerator pump (a Saniflo-type unit) that pushes waste down to the stack below. We design the full drainage solution during the free survey.
What size en-suite can fit in a loft conversion?
A well-designed loft en-suite fits a shower, toilet, and basin into as little as 3–4 m². For example, a 900×900 mm corner shower, a close-coupled WC, and a small vanity basin slot neatly into a compact footprint. Where headroom allows, we can add a bath instead. Crucially, we plan the layout around any sloping ceilings so the room feels comfortable rather than cramped.
Does a loft en-suite conversion add more value than a bedroom alone?
Yes, consistently so. A master bedroom with an en-suite is one of the features UK buyers want most. Research from Nationwide and several estate agent surveys suggests an en-suite adds 4–7% more to property value than a bedroom alone. As a result, a well-executed loft en-suite conversion ranks among the highest-returning home improvements you can make.
What building regulations apply to a loft bathroom?
A loft bathroom must meet six parts of the Building Regulations. Part A covers structure and floor loading, Part B covers fire safety, and Part F requires a mechanical extract fan. In addition, Part G covers drainage and water efficiency, Part L covers warm-roof insulation, and Part P covers safe electrics in a wet zone. We design every en-suite to meet all of these. Building control then inspects the plumbing, drainage, electrical, and structural work before sign-off.
Can a loft conversion include both a separate bedroom and a separate bathroom?
Yes. Where the loft is large enough, we can build a separate bedroom and a separate bathroom in the same conversion, giving you a fully self-contained suite. This works best with a dormer or mansard conversion, since the extra floor space and headroom leave room for two distinct rooms. During the design stage, our designers will show you how to divide the space most effectively.

Explore More

Available across London

Related guides

Other services

Create Your Loft Master Suite

Start with a free estimate for a complete bedroom and en-suite bathroom in your loft. After a free survey, we follow up with a fixed-price quote you can rely on.

Get a Free Estimate →