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Four Oaks Builders / Sutton Coldfield

The Sutton Coldfield house extension guide

The four problems that turn extensions into nightmares, how to avoid every one of them, and what to check before you sign with any builder around Sutton Coldfield.

1. Why extensions go wrong

The four extension nightmares, and how we fix every one.

Most extension horror stories come down to the same four problems. Here is what they look like, how Four Oaks avoids them, and what to ask any builder you speak to.

The vanishing builder

The problem

Footings get dug with great energy, then the builder disappears for three weeks to juggle another job. You are washing up in the bath while the build drags through autumn and winter.

The Four Oaks fix

A dedicated crew on your property every working day until handover, with trades lined up back to back so the roof goes on and the house is watertight in weeks, not seasons.

Tip: Ask any builder: how many days a week will someone be on my site, and what else are you running at the same time?

The cheap quote and the surprise extras

The problem

A low quote wins the job by quietly leaving out drainage, steel, plastering or making good. Once your back wall is down, the 'unforeseen' bills arrive and you are stuck.

The Four Oaks fix

Justin checks the ground, drains and structure on site, then prices a line-by-line specification for the finished room, not half a job.

Tip: Never compare quotes on the total alone. Compare what each one actually includes, line by line.

You become the unpaid site manager

The problem

Ringing electricians who never answer, begging the roofer to turn up on Tuesday and refereeing trades on your lunch break.

The Four Oaks fix

Justin manages every trade in sequence: groundworkers, bricklayers, roofers, joiners, plumbers and electricians, with one person accountable for the lot.

Tip: Ask who you ring when something goes wrong, and whether that person is actually on site.

The sloppy finish and endless snagging

The problem

The tools go, but the doors catch, the patio joints look messy and your snagging texts go unanswered for months.

The Four Oaks fix

A complete finish from the steels to flush door thresholds, neat patio transitions and a clean handover, the standard you can see in our Four Oaks project.

Tip: Ask to see finished work up close, not just photos of the shell going up.

2. The pace of your build

Lone builder or dedicated team?

The biggest cost of an extension is often not money. It is how long your home is a building site.

The lone builder

  • One person digging, laying bricks, roofing and plastering in turn
  • Often juggling other jobs, so days on site come and go
  • Work can drag on for six to nine months
  • Months without a kitchen, with dust and noise through the seasons

A dedicated Four Oaks team

  • A dedicated crew on site every working day
  • Groundworkers, bricklayers, roofers and joiners lined up back to back
  • One person managing the whole build from start to finish
  • Your home and garden back in weeks, not seasons

3. What really decides the budget

Why online price guides miss the point.

Two extensions of the same size can cost very different amounts. These are the things that make the difference on Sutton Coldfield homes.

Ground and foundations

Clay soil, tree roots and sloping gardens are common around Sutton Coldfield and can change how deep and how strong the foundations need to be.

Drains and services

Shared drains, manholes under the new floor, and gas or electric meters in the way all need planning before digging starts.

Knocking through

Opening up the back of the house means steel beams sized by a structural engineer for your property, plus temporary support while they go in.

Glazing and roof

Bifolds, sliding doors and roof lanterns shape the look and the light, and they also affect the steelwork and the roof design.

Access

Narrow side paths or no rear access change how materials arrive, how waste leaves and how the work is sequenced.

Finish and specification

Flooring, cladding, paving, kitchens and bathrooms are where two similar-sized extensions differ the most.

4. Before you sign

What every builder's quote should include.

Use this checklist on every quote you get, including ours. If an item is missing, ask why before you sign.

  • Groundworks and foundations, including what happens if deeper digging is needed
  • Drainage connections and any manholes to move or build over
  • Steel beams, padstones and the structural engineer's calculations
  • Building control fees and inspections
  • Roof, insulation, windows, doors and any roof lanterns
  • Electrics, plumbing, heating and plastering
  • Making good where the new room meets the old house
  • Skips, scaffolding and site clearance
  • Flooring, decorating and any outside paving
  • Who manages the trades, and how changes are priced

5. During the build

Living at home while the work happens.

Most families stay at home throughout. A little planning makes it far easier.

Keep a working kitchen

A temporary kitchen in another room, with a sink and plug-in appliances, makes the build far easier to live with.

Seal off the work

Dust sheets and sealed openings keep the mess in the work area. The back wall usually stays up until the new room is weathertight.

Water and heating stay on

Services are only switched off for short, planned periods, and you are told in advance.

Know the noisy days

Digging, steel installation and knocking through are the loudest stages. Knowing when they happen helps you plan work and school runs.

6. Start to finish

The stages of an extension.

  1. Stage 1: Look-round and design

    Justin visits, sees the space and talks through how you want to live. Drawings and engineer's calculations follow.

  2. Stage 2: Planning and building control

    Many single-storey rear extensions fall under permitted development. Building regulations approval is needed either way.

  3. Stage 3: Groundworks and foundations

    Digging, foundations and drainage, inspected by building control before anything is built on top.

  4. Stage 4: Walls and roof

    Brickwork goes up, the roof goes on and windows and doors go in, so the room is weathertight.

  5. Stage 5: Knocking through

    With the new room sealed, the steels go in and the old back wall comes out.

  6. Stage 6: First fix, plaster and second fix

    Electrics, plumbing and heating are run, walls are plastered, then sockets, lights and radiators are fitted.

  7. Stage 7: Finishing and handover

    Flooring, kitchen or bathroom, decorating, paving and a full clean before you get your home back.

Not sure about planning? Try our extension planning checker, or see a finished build in our Four Oaks house extension story.

7. Your questions

Common questions.

How long does a single-storey extension take?

With a dedicated team on site every day, most single-storey extensions are built in weeks rather than months. The exact timeline depends on the size, the ground and the finish, and Justin will give you a realistic programme after seeing the space.

Do I need planning permission for a rear extension?

Not always. Many single-storey rear extensions in England can be built under permitted development rights, within limits on depth, height and position. Our extension planning checker gives a first indication, and your designer or the council can confirm the full position.

Can we stay living at home during the build?

Usually, yes. Most families stay at home. The back wall normally stays up until the new room is weathertight, services are only off for short planned periods, and a temporary kitchen keeps daily life going.

What should a builder's quote include?

Groundworks, drainage, steelwork and engineer's calculations, building control, roof and glazing, electrics, plumbing, plastering, making good, skips and scaffolding, and finishes. If something is missing, ask before you sign.

Where do cheap extension quotes go wrong?

Low quotes often leave out drainage, steel, plastering or making good. Those extras appear once the walls are already down. A detailed specification agreed up front avoids that.

Do you build extensions outside Sutton Coldfield?

Yes. We work across Sutton Coldfield, Four Oaks, Little Aston, Streetly, Walmley, Solihull, Dorridge, Hampton in Arden, Lichfield, Tamworth and the surrounding areas.

Have Justin over for an informal 20-minute look-round.

An experienced builder's eye on the actual space often spots practical ways to save on materials, layout and drainage.

Call Justin on 07400 805 405WhatsApp JustinBook a look-round