How much does a single storey extension cost in the UK?

A single storey rear extension typically costs £1,500–£2,500 per m² in the UK. Zipflow generates an accurate quote based on your specific dimensions and specification.

Can builders quote loft conversions on Zipflow?

Yes. Zipflow handles Velux, dormer, hip-to-gable and mansard conversions including en-suite and structural work.

Builder Quoting App UK — Zipflow | Instant Building Quotes by Voice

How it works

From job description to quote in under 10 seconds

Three steps. No training required. Works on your phone on site.

1

Describe the job

Hold the mic and speak naturally — or type. Say something like "Single storey rear extension, 4 by 4 metres, block and render, new roof, bi-fold doors, not including electrics or plumbing" and Zipflow understands exactly what's involved.

2

Refine the details

Zipflow detects every task and asks the right follow-up questions — floor area, foundation type, roof spec, window count. Tap to confirm. Common answers auto-filled from your description.

3

Send the quote

A professional quote is generated with UK day rates and your markup applied. Send via WhatsApp, email or SMS in one tap. Customers accept or decline online — you get notified instantly.

Live example

Try a single storey rear extension

This is what Zipflow detects from a single voice description — tasks, pricing and all.

mic You say…

Voice input

Single storey rear extension, 4 metres by 4 metres, block and render finish, flat roof with lantern, bi-fold doors, concrete strip foundations, not including electrics or plumbing

Zipflow detects

foundation

Excavation & foundations

£3,200

home_work

Block and brick walls

£4,800

roofing

Flat roof with lantern

£3,600

door_sliding

Bi-fold door supply & fit

£2,800

format_color_fill

Internal plastering & finish

£1,900

layers

Render external walls

£1,400

handyman

First fix carpentry

£800

Total quote (inc. 18% markup) £18,500

Builders jobs covered

Every building job UK builders quote for

Zipflow handles domestic and light commercial building work from extensions to brickwork.

home_work

Single storey extension

Rear, side, wrap-around, block and render or timber frame

Typical range: £12,000–£35,000

roofing

Loft conversion

Velux, dormer, hip-to-gable, mansard, with or without en-suite

Typical range: £18,000–£55,000

home_repair_service

Knock through

Load-bearing and non-load-bearing, steel RSJ, lintel

Typical range: £800–£4,000

deck

Garden room / outbuilding

Timber frame, insulated, electrics, base

Typical range: £5,000–£20,000

foundation

Brickwork & blockwork

Garden walls, boundary walls, repointing, chimney

Typical range: £400–£5,000

water_damage

Damp proof course

Injection DPC, tanking, cavity membrane, replastering

Typical range: £500–£3,000

garage

New driveway

Block paving, tarmac, resin, concrete, drainage

Typical range: £1,500–£8,000

engineering

Underpinning

Mass concrete, mini-pile, beam and base

Typical range: £5,000–£20,000

garage

Garage conversion

Structural, insulation, plasterboard, door infill

Typical range: £6,000–£15,000

Why builders use Zipflow

Built for the way builders actually work

Not a generic tool. Zipflow understands building work — extensions, groundworks, finishes.

mic

Voice-first on site

Quote while you're still at the property. Hold the mic, describe the job in plain English — no forms, no spreadsheets. Works with dirty hands, in poor signal.

currency_pound

UK builders day rates

Prices based on current UK builder and groundworker day rates. Set your own markup and it applies automatically to every quote.

picture_as_pdf

Professional PDF invoices

Once a job is accepted, generate a branded PDF invoice with VAT, payment terms and your business details. Send direct from the app.

notifications

Customer accepts online

Customers get a clean quote link — no login required. They accept or decline and you get a push notification instantly. Chase reminders sent automatically.

calendar_month

Job pipeline & schedule

Every accepted job goes into your pipeline. See your week at a glance, track outstanding quotes, and know exactly what's coming up.

verified

GDPR compliant, ICO registered

Your customer data stays on secure UK/EU servers. Zipflow is registered with the ICO (ZC133493). No ads, no data selling, ever.

FAQ

Common questions from builders

Everything you need to know before getting started.

A single storey rear extension typically costs £1,500–£2,500 per m² in the UK depending on specification, roof type and finishes. A 16m² extension typically runs £18,000–£35,000. Zipflow generates an accurate quote based on your specific dimensions and spec.

Yes. Zipflow handles Velux, dormer, hip-to-gable and mansard conversions with options for en-suite, Juliet balcony, and structural alterations.

Yes — load-bearing and non-load-bearing walls, RSJ sizing, lintel, and temporary support. The app asks the right questions about wall type and span.

Yes — WhatsApp, email or SMS in one tap. Customers get a professional quote link they can accept or decline online.

Yes — free during the beta period. No credit card required.

Building quotes in seconds, not hours

From job description to quote in under 10 seconds

Try a single storey rear extension

Every building job UK builders quote for

Built for the way builders actually work

Common questions from builders

Start quoting in seconds