Building Service · Greater Manchester
House Extension Buildersin Salford & Greater Manchester.Designed, engineered and built in-house.
Add the room you actually need, kitchen-diner, family room, master suite or home office, with a fixed written price, a fixed programme and a single accountable team from drawings to decorating.
40+ combined years on the tools · Fully insured · Written workmanship guarantee
Overview
What it is, who it's for and why it matters.
What it is
A house extension increases your home's footprint by adding new structural floor area, single-storey rear, side-return, wrap-around or two-storey, fully tied into the existing building, foundations and services. We design around your existing layout, your daylight and your budget, then build it with our own bricklayers, joiners and structural team.
Who it's for
Homeowners in Salford, Manchester and the surrounding boroughs who have outgrown the house but love the location. Typical clients are growing families wanting an open-plan kitchen-diner, professionals adding a home office and bedroom, and landlords increasing yield and resale value on period stock.
When you need it
The right moment is usually 6–12 months before you need the finished space, that allows time for measured survey, planning or Permitted Development assessment, Building Control package, structural calculations and a realistic 10–20 week build programme.
Why professional help matters
An extension is a structural alteration to your home. A weak foundation, undersized steel or poorly detailed roof junction will not show up for years and is brutally expensive to put right. Using a builder who issues their own drawings, structural calculations and warranty is the difference between an asset and a liability at resale.
What goes wrong
The failures we are most often asked to put right.
Most botched extensions in Greater Manchester share the same root causes. Ignoring them costs five-figure remedial bills.
Damp at the junction
Cold bridges between the new build and the existing wall lead to black mould within 12 months, a sign the cavity, DPC and insulation were not detailed correctly.
Cracking above openings
Undersized steels, missing pad-stones or skipped Building Control sign-off cause hairline cracks that telegraph through plaster within a season.
Flat roofs that pond
Falls under 1:40, missing GRP upstands and stubby outlets all cause standing water, and water always finds a route inside.
Underestimated programmes
Cash-flow disputes are the number one reason builds stall. We give you a written programme of works with stage payments tied to milestones, not deposits.
Our process
A clear, repeatable system, from first visit to final sign-off.
- Step 1
Site survey & feasibility
Free no-obligation visit. We measure, photograph and discuss what you want the finished space to do, not just how big it is.
- Step 2
Drawings & structural design
We produce planning or Permitted Development drawings, Building Regs package and structural calculations in-house or with our retained engineer.
- Step 3
Fixed-price quotation
A line-by-line written quote, fixed for 90 days, with a stage-payment schedule. No vague day-rates. No moving targets.
- Step 4
Build phase
Groundworks, structure, weather-tight, first fix, plaster, second fix, decoration. One project manager, one trade ledger, one phone number.
- Step 5
Sign-off & guarantee
Building Control completion certificate, electrical and gas certificates, snag walk-around and your written workmanship guarantee in a single handover pack.
Why work with Renovo
Concrete outcomes, not vague promises.
Speed
Typical single-storey rear: 10–14 weeks from groundworks to handover. Two-storey: 14–20 weeks. Issued in writing with your quote.
Safety
All structural openings designed and signed off by a chartered engineer. Gas Safe, NICEIC and FENSA registered trades on regulated installations.
Longevity
Cavity-tray DPCs, full-fill insulation and matched brickwork detailing, extensions designed to outlive the mortgage, not the warranty.
Cost control
Stage payments tied to milestones, not weekly cash demands. Provisional sums explained line-by-line so you know exactly what is variable.
Single accountability
Bricklayers, joiners, plasterers, electricians and plumbers are ours or sub-contracted under our contract, never your problem to chase.
Resale uplift
A correctly built extension in Greater Manchester typically returns 70–110% of its cost at resale and shortens time-on-market.
Detail & specification
The technical detail, for people who want to know how the work is done.
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Detail & specification
The technical detail, for people who want to know how the work is done.
Read the technical detailHide the technical detail
Types of extension we build
We design and build every common residential extension format across Salford, Manchester and the surrounding boroughs.
- Single-storey rear extensions, the classic kitchen-diner opener.
- Side-return infills on Victorian and Edwardian terraces.
- Wrap-around extensions combining rear and side-return.
- Two-storey rear and side extensions, adding bedroom and bathroom upstairs.
- Over-structure extensions above existing garages or single-storeys.
- Orangery and glazed-link extensions with structural roof lanterns.
Materials & construction
We work in traditional cavity masonry as standard, block inner leaf, full-fill mineral wool, brick or render outer leaf, colour and texture matched to your existing facade. Timber-frame and SIPs are offered where programme or thermal performance demands it. Roofs are either warm-deck flat (GRP, EPDM or single-ply) or pitched in slate or concrete tile to match the host building. Glazing is double or triple-glazed aluminium or composite to current Part L U-values, with structural openings designed by our retained engineer.
Planning, Permitted Development & Building Regs
Many single-storey rear extensions in Greater Manchester fall under Permitted Development (PD), but PD rights are not automatic, Article 4 directions, conservation areas, listed buildings and earlier extensions all change the picture. We assess this on every project, prepare the Lawful Development Certificate or full planning application where required, and submit the Building Regs full-plans application before a brick is laid. Party Wall notices are co-ordinated by us with the appointed surveyor.
Residential vs commercial
Most of our extension work is residential, but the same team builds light-commercial extensions, shop-front infills, surgery and clinic side-extensions, and office rear extensions, under CDM 2015 with a principal contractor appointment. Standards are higher (fire compartmentation, accessibility, fire-engineered escape) and we handle those specifications in-house.
Recent work
A look at recent projects across Greater Manchester.
A selection of finished builds. See the full set on the Our Work page.
Areas covered
House Extensions across Salford, Manchester and Greater Manchester.
FAQ
Straight answers to the questions clients actually ask.
Still got a question? Call us on 07701 078833 or request a callback.
How much does a single-storey extension cost in Salford?+
As a guide, a turnkey single-storey rear extension in Greater Manchester runs roughly £2,200–£3,200 per m² depending on roof type, glazing spec and existing-build complexity. We issue a fixed written quote after a free site visit, never a day-rate.
How long will it take?+
A typical single-storey rear takes 10–14 weeks from groundworks to handover. Two-storey and wrap-around extensions run 14–20 weeks. You receive a written programme of works with your quote.
Do I need planning permission?+
Often no, many single-storey rear extensions fall under Permitted Development. We assess every project against the GPDO, Article 4 directions and conservation status, and apply for a Lawful Development Certificate or full planning where appropriate.
Do you handle the Party Wall agreement?+
Yes. Where a Party Wall notice is required, we serve the notices, appoint the surveyor and manage the schedule of condition on your behalf, your build does not stall on it.
How are payments structured?+
Staged payments tied to milestones, Groundworks complete, Weather-tight, First fix, Plaster, Practical completion. No large upfront deposit. Everything in writing before we start.
What guarantees do I get?+
Written workmanship guarantee from Renovo Design & Build Ltd, plus manufacturer warranties on roofing, glazing and boilers. Gas Safe, NICEIC and FENSA certification issued on completion.
Will I have to move out?+
For single-storey rear and side-return extensions, no. We hoard the working area, keep the kitchen running where possible and dust-seal the rest of the house. Two-storey work usually means 2–4 weeks without an upstairs bathroom.
Do you build outside Salford?+
Yes, we cover Manchester, Bolton, Wigan, Stockport, Oldham, Rochdale, Bury and Warrington. If you are a little further out, call us, we may still be a fit.
Can you work to my architect's drawings?+
Absolutely. Bring an existing drawing pack and we will price it line-by-line. We will also flag anything we believe is under-specified before you sign.
Related services
Often combined with house extensions.
Structural Work & Steels
Wall removals, RSJ installs, underpinning and structural alterations, in-house.
Loft Conversions & Dormers
Velux, dormer and hip-to-gable conversions that pass building control first time.
Full Renovations
Whole-house refurbishments managed end-to-end, from strip-out to final coat.
Next step
Book a free, no-obligation site visit.
Tell us what you want the finished space to do. We will measure, talk feasibility and follow up with a fixed written price within 7 working days.
- Fixed-price written quote, no day-rate surprises.
- Single accountable team, no subcontractor finger-pointing.
- Stage payments tied to milestones, no large upfront deposit.
- Building Control sign-off and written workmanship guarantee.