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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 private en-suite bathroom in your loft. We handle all structural work, plumbing, drainage, waterproofing, tiling, and design — a single fixed price, single point of contact.

From £28,000
Timescale: 8–12 weeks

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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. It combines the structural work of a standard loft conversion with the added complexity of routing plumbing, drainage, and electrical services to a wet room at roof level.

The additional value of an en-suite over a bedroom alone is well documented. A master bedroom with private shower room is among the top five features that buyers say they want in a property. The combination typically adds more to the sale price than the sum of its parts — making it not just a lifestyle improvement but a sound financial decision.

We manage the entire project in-house — from structural engineering and dormer design through to plumbing, drainage, tiling, and final decoration. There is no need to coordinate separate contractors. Our 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 requires a little more loft floor area than a bedroom alone. Check 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

Includes all structural, plumbing, tiling, and electrical work. Final cost depends on en-suite specification, bathroom fittings, and the type of conversion chosen.

Build Programme

8–12 weeks

The added plumbing and tiling phases extend the programme slightly compared with a bedroom-only conversion. All trades are coordinated by our project manager.

Frequently Asked Questions

How is plumbing routed to a loft en-suite bathroom?
Routing plumbing to a loft en-suite is more complex than a ground or first floor bathroom because it involves longer pipe runs and careful planning to ensure drainage falls correctly. Cold water supply can usually be run from the existing cold feed with minimal disruption. Hot water is typically fed from the existing hot water cylinder or a new unvented cylinder, or we can install a dedicated electric shower unit. Drainage is the key challenge: waste from the loft must discharge via gravity through the existing soil stack or, where gravity is insufficient, via a macerator pump (Saniflo-type unit) connected to the main soil stack below. We assess and design the drainage solution on survey.
What size en-suite can fit in a loft conversion?
Even in a relatively compact loft, a well-designed en-suite can include a shower, toilet, and basin within as little as 3–4 m². A corner shower enclosure (900×900 mm), close-coupled WC, and a small vanity basin can be arranged efficiently to work within the available floor area. Where headroom allows, a bath can also be incorporated. We use our design experience to plan the bathroom layout around any sloping ceilings to maximise both function and comfort.
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 most desirable features for house buyers across the UK. Research from Nationwide and several estate agent surveys suggests that adding an en-suite to a master bedroom can add 4–7% more to property value compared with a bedroom alone. When combined with the overall bedroom addition, a well-executed loft en-suite conversion is among the highest-returning home improvements available.
What building regulations apply to a loft bathroom?
A loft bathroom must comply with several sections of the Building Regulations: Part A (structural — floor loading for bathroom fittings), Part B (fire safety — fire-rated construction throughout), Part F (ventilation — mechanical extract fan in the bathroom), Part G (sanitation — correct drainage, water efficiency), Part L (insulation — warm roof spec), and Part P (electrics — safe installation in a wet zone). We design every en-suite to meet all applicable regulations, and building control sign-off includes inspection of the plumbing, drainage, electrical, and structural elements.
Can a loft conversion include both a separate bedroom and a separate bathroom?
Yes — where the loft space is large enough, we can create a separate bedroom and a separate bathroom within the same conversion, giving you a fully self-contained suite. This is particularly achievable with a dormer or mansard conversion where the additional floor space and headroom provide enough room for two distinct rooms. Our designers will show you how the available space can be divided most effectively during the design stage.

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