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Loft conversions

Turn your loft
into living space.

A loft conversion is the single most cost-effective way to add space and value to a South East London home. Hutch delivers every type — from a basic Velux to a full mansard — on a fixed fee, with free structural drawings and a dedicated project manager.

Get an instant quote →How it works
At a glance
£14k
Starting cost (Velux)
£85k+
Added property value
4wks
Fastest programme
Free
Structural drawings
All loft conversions include: fixed fee · structural drawings · building regs · dedicated PM · 10-year warranty
5
Conversion types
we build
+£85k
Average value added
SE London
100%
Fixed fee — no
cost overruns
Free
Structural drawings
on every project
Types of loft conversion

Which conversion
is right for you?

The conversion type is the biggest single factor in cost and usable space. Here’s what each option delivers.

Velux / Roof lights only
The simplest and least invasive option. Velux windows are fitted into the existing roof slope — no structural changes to the roofline.
Typical cost£14k – £19k
Most popular
Rear dormer
A flat-roofed box structure added to the rear slope of the roof, dramatically increasing headroom and usable floor area. Most popular for SE London terraces.
Typical cost£38k – £48k
L-shaped dormer
A rear dormer combined with a side dormer over the back addition — creating an L-shape when viewed from above. Maximum-space option.
Typical cost£52k – £65k
Hip-to-gable
For semi-detached and end-terrace houses with a hipped (sloping) roof end. The sloping hip is replaced with a vertical gable wall.
Typical cost£44k – £56k
Mansard
The most substantial loft conversion — the rear roof slope is replaced with a near-vertical wall. Creates maximum volume.
Typical cost£68k – £85k
Why Hutch for loft conversions

What makes the
difference.

📐
Free structural drawings — always
Every loft conversion requires structural calculations. We include these free. Most builders charge £1,500–£2,500 separately.
🔒
Truly fixed price before we start
Hutch confirms your fixed price in writing before a tile is moved. That number doesn’t change.
📋
Party wall managed end-to-end
Mid-terrace and semi loft conversions almost always trigger the Party Wall Act. We manage the entire process.
🏠
Permitted development expertise
Most rear dormers fall under Permitted Development — no planning needed. We advise from the outset.
🧱
Premium materials specified
GRP flat roofing, quality timber framing, proper insulation to building regs standards throughout.
👤
Dedicated PM reachable daily
Your PM co-ordinates all trades and keeps the programme on track.
Pricing

What does a loft
conversion cost?

Transparent cost ranges based on recent SE London projects. All prices at standard spec — add-ons listed below.

Conversion typeBest forProgrammeTypical fixed fee
Velux / roof lightsHouses with good existing headroom4–6 weeks£22k – £35k
Rear dormerAll terraces and most semis8–12 weeks£45k – £65k
L-shaped dormerMid and end-terrace with back addition10–14 weeks£60k – £78k
Hip-to-gableSemis and end-terraces with hipped roof10–13 weeks£48k – £68k
MansardMaximum volume — planning required14–18 weeks£68k – £85k
All prices at standard spec and include structural drawings, building regs, project management and 10-year warranty.
Common add-ons
En-suite bathroom
Shower, WC and basin. Requires plumbing run from below.
+£7,000 – £9,000
En-suite + study
Full master suite with separate workspace.
+£11,000 – £14,000
Juliet balcony
Floor-to-ceiling glazed door with guard rail to rear dormer.
+£2,000 – £3,500
Full-width dormer glazing
Aluminium-framed glazing across the full dormer width.
+£4,000 – £6,000
Spiral staircase
Space-saving alternative to a standard stair.
+£2,500 – £4,000
Party wall agreement
Surveyor fees for one or two neighbours.
+£1,500 – £2,500
The process

From first call
to final sign-off.

A typical loft conversion from first enquiry to completion takes 16–22 weeks including pre-construction.

1
Week 1
Free instant estimate & site visit
Use our online estimator for an immediate ballpark. Book a free site visit — your PM attends, assesses headroom, structure, access and party wall obligations, and confirms your fixed price within 48 hours.
2
Weeks 2–4
Structural drawings & scope of works
Structural engineer calculates steel beam specification, produces drawings for building control. Scope of works produced covering every element. You review and sign off before we proceed.
3
Weeks 4–8
Party wall, planning & pre-construction
Party wall notices served where required. Lawful Development Certificate or planning application submitted if needed. Materials ordered, trades booked and sequenced.
4
Weeks 8–12
Structural works on site
Scaffolding erected, roof tiles stripped, dormer structure built, steel beam installed, new floor structure constructed. BCO inspection at structural stage.
5
Weeks 12–18
First & second fix, finishes
Staircase, first fix electrics and plumbing, insulation, boarding and plastering. Second fix electrics, plumbing, bathroom fit (if included), joinery, decoration.
6
Week 18–22
Snagging, sign-off & warranty
Formal snagging walkthrough with your PM. All items resolved before final payment. Building regs completion certificate obtained. 10-year warranty certificate issued.
Featured project

L-shaped dormer,
Brockley SE4.

Luxury en-suite bathroom SE4 Brockley loft Aerial view L-shaped dormer SE4 Master bedroom SE4 loft conversion
£68.5k
Fixed fee
11 wks
Programme
28 m²
Floor area
+£85k
Value added
The project
Victorian mid-terrace in Brockley, SE4. The clients wanted to convert the loft into a master suite with en-suite and study. An L-shaped dormer was the ideal solution, creating 28m² of usable floor space.

Challenges: party wall with both neighbours, tight staircase position, and a leaky existing roof. All resolved within the fixed price.
What was included in the £68,500
Structural drawings and SE calculations · Party wall notices and awards for both neighbours · Scaffolding and roof strip · L-shaped dormer structure · New floor structure with acoustic insulation · Juliet balcony glazed door · Steel beam over stairwell · Loft staircase · First fix carpentry, electrics and plumbing · En-suite (shower, WC, basin, UFH) · Boarding, plastering · Second fix · Building regs completion certificate · 10-year warranty
The fixed price was the thing that sold us. Three other builders gave estimates between £55k and £90k — with Hutch the number was £68,500 and that’s exactly what we paid.
SB
Sam & Beth R.
L-shaped dormer · Brockley, SE4
FAQ

Loft conversion
questions answered.

Most rear dormer, hip-to-gable and L-shaped dormer conversions fall under Permitted Development rights — no planning application is required. Exceptions: mansard conversions always require planning. Conservation areas restrict PD rights. We advise at the site visit.
Key factors: headroom (need at least 2.2m from floor to ridge), roof pitch, and roof type. We assess all at the free site visit.
For any loft conversion that involves building on or cutting into a shared wall, you are legally required to serve a Party Wall Notice. Hutch manages the entire party wall process as part of your project.
Yes — loft conversions are among the most liveable construction projects. The roof is made weathertight before internal works begin.
Consistently, yes. SE London terraces typically see a value uplift of £75k–£120k from a well-executed dormer conversion.
Other services

Explore more
Hutch projects.

🏗
Extensions
Rear, side return, wraparound. Fixed fee. From £2,200/m².
 🍳
Kitchens
Full kitchen renovations including wall removal.
 🚽
Bathrooms
From standard refits to luxury wet rooms. From £5,500.
 🏘
Full Refurbishments
Whole-house renovation. One team, one price.
Ready to convert your loft?
Get a fixed-fee estimate in minutes. Site visit within 5 working days.
Get an instant quote →📞 0330 122 6866