Alliance Maintenance Services
House Extensions

Extensions That Transform How You Live.

Single-storey, rear, side and open-plan extensions across Greater Manchester — designed, built and finished by one trusted team.

About Our Extensions

From foundations to finished interior.

We handle every stage of an extension — design and planning support, foundations, brickwork, steels, roofing, glazing, plastering and joinery. All aspects of joinery undertaken in-house, with one point of contact and one project manager. Built properly so it adds real value to your home.

An extension is the biggest home improvement most people ever commission. Done properly it adds a full room, transforms how you live, and pays back handsomely if you ever sell. Done badly — mismatched brick, sagging steel, poor detailing — it can knock value off the whole house.

We handle every stage in-house: architectural drawings and planning support, structural calculations, foundations, brickwork, structural steels, roofing, glazing, plastering, joinery, kitchen and bathroom fit-out, and finishing. One point of contact from first visit to handover.

Fully Insured
Free Quotes
Quality Materials
Professional Install
10-Year Guarantee
Local Family Team
Extension Types

Every kind of extension, all aspects covered.

Single-Storey Extensions

Add a kitchen-diner, family room or utility — most permitted-development friendly.

  • Foundations to finish
  • Steels & structural calcs
  • Building Regs handled

Rear Extensions

Open up the back of the house with bi-folds or sliding doors onto the garden.

  • Up to 6m projection
  • Glazed roofs & skylights
  • Brick or render finishes

Side Extensions

Fill in the side return or wrap around for a larger ground floor.

  • L-shape and wrap-around
  • Matches existing brickwork
  • Maximises kitchen space

Open-Plan Living Spaces

Knock through and open up — kitchen-diner-living with steels and structural alterations.

  • Removing internal walls
  • RSJ / steel beams installed
  • Structural calcs included

Structural Alterations

Load-bearing wall removals, lintels, beams and openings to existing properties.

  • Building Control sign-off
  • Steels supplied & fitted
  • Plastered finish ready
Why Choose Us

All trades in-house. One team. One price.

Full Project Management

Foundations, brickwork, roof, glazing, plastering — one team.

Building Regs Handled

We manage Building Control and structural calcs.

Fully Insured

Public & employers' liability, plus 10-year guarantee on build.

Bi-Folds, Sliders & Skylights

Integrated glazing for light-filled extensions.

Quality Finish

Brickwork, plastering and joinery to a premium standard.

Real Value Added

Properly built extensions add measurable value.

Materials & Specification

The build-up, layer by layer.

  • Trench-fill or piled foundations to structural engineer's spec
  • Insulated cavity brickwork — 100mm PIR or full-fill mineral wool
  • Matching facing brick or through-coloured silicone render
  • Structural steel beams — supplied, calculated and Building Control signed off
  • Warm roof or lantern roof to your spec — with slate, tile or single-ply EPDM
  • Aluminium bi-fold, sliding or French doors as standard
  • Roof lanterns, Velux windows and skylights fully integrated
  • Building Regulations sign-off, structural warranty and 10-year build guarantee
Our Process

12 weeks, one team, one price.

  1. Step 01

    Concept & feasibility

    1–2 weeks

    Site visit, discussion of use, size and layout, budget and planning feasibility.

  2. Step 02

    Drawings & planning

    6–10 weeks (if needed)

    Architectural drawings, structural calcs, planning submission where required.

  3. Step 03

    Written quotation

    Within 2 weeks

    Every stage priced — groundworks, brickwork, steels, roof, glazing, plaster, kitchen, finish.

  4. Step 04

    Groundworks & shell

    Weeks 1–4 of build

    Foundations, cavity brickwork, steels, roof structure, weather-tight.

  5. Step 05

    First-fix & glazing

    Weeks 5–8

    Plumbing, electrics, insulation, aluminium doors and windows, roof lanterns installed.

  6. Step 06

    Finishing

    Weeks 9–12

    Plastering, flooring, kitchen fit-out, decoration, snagging and Building Control sign-off.

Gallery

Recent Work

Rear Extension with Anthracite Bi-Fold Doors
Single-Storey Rear Extension — Brickwork & Blockwork
Foundations & Sub-Base — Milnrow Extension
Indian Sandstone Patio & DPC Detail
Open-plan rear extension
Kitchen extension with skylights
Aftercare

Snagging, warranty and long-term care.

Every extension we build comes with a defects period and long-term guarantee. We're contactable if anything ever needs attention.

  • Snagging visit at 4 weeks — small settlement cracks in fresh plaster are normal and we come back to fill them
  • Keep gutters and downpipes clear — the number-one preventable maintenance issue on any new extension
  • Silicone seals around bi-folds and lanterns get a check at 12 months
  • Full 10-year insurance-backed build guarantee covers the structure long after we've handed over
  • For anything that ever doesn't feel right — call the office, we know your job
Areas We Cover

Extensions across Greater Manchester.

Rochdale, Manchester, Oldham, Bury, Bolton, Stockport, Middleton, Prestwich, Ashton-under-Lyne, Heywood, Tameside, Milnrow and every town in between.

FAQs

Frequently Asked Questions

Free Quote · No Obligation

Get a quote for Extensions.

Tell us about your project and we'll be back in touch — usually the same working day, always within 24 hours.

  • Family-run since 1998
  • Fully insured (£5m)
  • 10-Year Guarantee
  • REHAU Authorised · City & Guilds
  • Response within 24 hours

Response within 24 hours · We'll never share your details

Prefer to talk? 01706 299010
Ready To Improve Your Home?

Speak directly with a member of the family-run team.

No call centres, no scripts. Just honest guidance from the people who'll be doing the work.

Response within 24 hours — usually the same working day.

  • Family-run since 1998
  • Fully insured (£5m)
  • 10-Year Guarantee
  • REHAU Authorised · City & Guilds
  • Response within 24 hours
Get My Free Quote 01706 299010

Free · No-obligation · Family-run since 1998