Poole & DorsetRenovationsKnock-throughsOpen-plan

Clarity for yourhome renovation.

A clear, step-by-step approach. One point of contact from first ideas to final build.

Get a free callback

✓ Usually back within 30 min✓ Same person who answers the phone✓ No obligation

Or call 07700 195744
  • 5.0on Google
  • Fully insured
  • Building Control approved
  • Poole since 2017

Project-managed · Four stages

  1. 01DesignSurvey & drawings
  2. 02PlanningPermission & approvals
  3. 03Building ControlEngineering & sign-off
  4. 04BuildProject-managed on site

Opening up a kitchen, reconfiguring the downstairs, taking out a load-bearing wall — renovations and internal alterations are what we do. We project-manage the full package: survey, drawings, planning, Building Control, builder appointment and on-site delivery. One accountable contact from first call to final handover.

5.0 / 5

15 Google reviews

15 min

Free discovery call

No obligation

Point cloud

3D laser surveys

Millimetre-accurate, every project

£5m

Public liability cover

Fully insured

What we do

Internal structural alterations

We handle the full process for internal wall removals, steel beam installations and structural layout changes.

knockthroughKT

Knock-throughs

Remove internal walls to open up your ground floor. We survey, design, calculate and install.

rsjRSJ

RSJ / steel beam installation

Correctly sized steel beams with padstones, installed to structural engineer specifications.

openplanOP

Open-plan kitchen alterations

Kitchen-to-dining or kitchen-to-living knock-throughs with full structural support.

layoutLAY

Internal structural layout changes

Reconfigure your internal layout. Load-bearing wall assessments, new openings, repositioned doorways.

calcsCALC

Structural calculations & drawings

Beam sizing, padstone details, lintel schedules and full structural engineering drawings.

bcBC

Building control support

We handle the building control application and manage inspections through to sign-off.

Josh Carrivick, founder of PlanBuild

Got something in mind? Send a few details.

Tell us what you’re planning and we’ll come back to you — usually within 30 minutes.

How it works

Design is where every good renovation starts.

We run the full four-stage process for you — or you can start with just the design, take the drawings, and see us again when you need the next stage.

1Start here

DesignFrom first call to draft plans

Most renovation projects live or die at the design stage. Get it right and the build is predictable. Get it wrong and you spend the whole project fighting fires.

  • Free 15-min discovery call to scope your project
  • On-site visit + 3D point cloud scan of your property
  • Existing and proposed floor plans + structural opinion

Typically: Visit in 7 days · Plans in 5–10 working days

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Then, when you're ready

  1. 2

    Planning

    Permission or permitted development

    • We assess whether planning permission is actually required
    • If it is, we handle the full application end-to-end
    • Council correspondence, amendments, and decision managed for you

    Timeframe: 8–13 weeks for a full application (council-dependent)

    Check if you need planning
  2. 3

    Building Control

    Technical drawings, calcs and inspections

    • Structural engineer sizes steel, padstones and lintels
    • Full Building Control submission pack prepared and submitted
    • Site inspections booked and managed on your behalf

    Timeframe: ~2 weeks to prep · ~8 weeks BC review

    What BC route do I need?
  3. 4

    Build

    Project-managed on site, start to finish

    • You pick the winning builder — our construction arm quotes alongside two or three independent local builders you trust
    • Line-item, spec-led quote tied to the drawings — not a lump sum
    • Scheduled start, weekly written updates and photo log

    Timeframe: Project-dependent — weekly progress updates

    Estimate my build cost

Before you call

Get a personalised estimate for your project in 2 minutes.

Answer a handful of questions about your property and what you're planning. We'll build a tailored report showing what it's likely to cost, what planning route applies, and the typical timeline. No obligation. No sales call to unlock it.

  • Area-aware pricing (Poole, Bournemouth, Dorset, New Forest)
  • Planning route detection (Permitted Development or full application)
  • Timeline and constraint flags for your specific postcode

Interactive tool

Your personalised report

Build range · Planning path · Timeline · Constraints. Delivered on-screen, emailed if you want a copy.

Start my estimate

Free · No credit card · 2 minutes

What our customers say

Real Google reviews

5.0 / 5 from 15 reviews

Josh is very knowledgeable and offered lots of ideas in planning our extension. Paperwork and communication was punctual and always well documented. His team were a pleasure to have in the house, they were very clean, tidy and respectful to our (and our neighbours) property. I would not hesitate to recommend this company, they can do everything from start to finish for you.
Sandra W.Apr 2026
Plan Build did a design and build extension project for us. They worked very well with us going through the various design stages and successfully handling the planning permission process. Then on to the build stage where everything was kept on budget and time despite some pretty atrocious weather on the way. I would highly recommend Josh and his team to handle your building project.
Richie W.Jul 2025
I couldn't recommend Josh enough! He has been absolutely fantastic, nothing was too much trouble, he was happy to bounce lots of ideas back and forth until we were happy. He is polite, friendly and professional in every aspect. I would definitely be using his services again in the future when needed.
Kirsty H.Jan 2024
Josh Carrivick, founder of PlanBuild

Ready to start? Send your details.

Same Josh you’ve just read reviews about will personally come back to you.

Why PlanBuild

Projects change.
We change with them.

A renovation isn’t a straight line. Budgets shift, neighbours push back, lives change, ideas evolve. With separate consultants, every change means re-briefing everyone. With one project manager, the context is already with us — we just carry on.

  1. 01

    Budgets shift

    Materials move. Priorities change. We reshape the project against the new number — not restart the conversation.

  2. 02

    Neighbours push back

    Party wall notices, objections, unhelpful replies. We handle the back-and-forth so you’re not stuck negotiating.

  3. 03

    You change your mind

    Ideas evolve once drawings are on paper. Because we carry the brief, new thinking lands on the existing plan — not a fresh re-brief.

  4. 04

    Life gets in the way

    Illness, family, work. The project pauses cleanly and picks up again without you having to re-explain where you got to.

Rather not call?

Drop your details and we'll call you back.

Three short fields. Same person who picks up the phone will ring you — usually within 30 minutes in business hours.

Get a callback in 30 minutes

Quick-fill your details with Google — or type them in below.

Or call now — 07700 195744

Before you start

Common questions

Do I need structural calculations?+

If you are removing or altering a load-bearing wall, yes. A structural engineer must design the replacement support — typically a steel beam (RSJ) with padstones. We handle this as part of the package.

Do I need building control for removing an internal wall?+

Yes. Any structural alteration requires a building control application. The inspector will check the steelwork before it is covered up. We manage the full process from application to sign-off.

Can you install the steel as well?+

Yes. We provide the full package — survey, plans, engineering, building control and installation. You do not need to find a separate contractor.

Can you help with kitchen knock-throughs?+

Absolutely. Kitchen-to-dining and kitchen-to-living knock-throughs are our most common job. We assess the wall, design the opening, install the steel and make good.

What happens at the site visit?+

The on-site visit runs for around 2 to 3 hours. A qualified engineer walks the space with you, checks the wall construction, assesses the load path and captures a millimetre-accurate 3D point cloud scan of the relevant rooms. You'll get a verbal summary before we leave and draft plans 5 to 10 working days later.

How quickly can you provide plans and calculations?+

Draft floor plans are typically delivered within 5 to 10 working days of the on-site visit. If structural calculations are needed, those follow within about a week after the plans are signed off. If you need it faster, ask about priority turnaround.

How long does a typical project take, start to finish?+

For a structural knock-through with drawings, calcs and Building Control: roughly 4–8 weeks of design and approvals, then 2–4 weeks on site depending on scope. For a larger rear extension going through planning: usually 4–6 months end-to-end, split between around 10 weeks of approvals and the build programme on site. These are ranges, not promises — planning committees and weather don't always cooperate. You get a realistic timeline in the discovery call and a weekly update once the project is running.

What if the project goes over budget?+

Budget drift usually starts before the build does — a surprise in the survey, a layout change you want after seeing drawings, or an engineering detail that needs re-thinking. Because we coordinate the full package, we spot those triggers early and flag the cost impact before you commit. Design-stage prices on this site are fixed — no mid-stage surcharges. At the build stage, costs come from a line-item quote tied to the drawings, so any change is priced as a variation and agreed before it happens, not buried in a lump sum.

What if planning or Building Control is refused?+

We only submit what we think will pass, and the feasibility check at the start of the project is specifically there to catch anything that won't. Most householder alterations go through permitted development or a standard Householder application without issue. If a submission is refused, we'll explain exactly why (the officer's report is public), make the revisions the LPA has flagged, and resubmit. The resubmission fee to the council is typically waived within 12 months of the original application.

What happens if my neighbours object or I have a party wall issue?+

Planning objections only carry weight if they raise valid planning grounds — "I don't like it" isn't one. We draft submissions that anticipate the common objections (overlooking, light, daylight/sunlight, boundary). Party wall notices are a separate legal process if the work affects a shared wall or excavation near a boundary: we flag it early, explain the options (agreed surveyor vs. separate surveyors), and handle the back-and-forth so you're not stuck negotiating with a difficult neighbour on your own.

Can I take the drawings to another builder?+

Yes — absolutely. The drawings are yours to keep. Most of our clients do come back to us for the build because we've engineered it and we can warrant the work end-to-end, but you're under no obligation. At the quote stage we'll happily put our construction quote alongside two or three other builders quoting against the same spec, so you can compare fairly.

One project manager. Start to finish.

Tell us what you're planning and we'll call you back — usually within 30 minutes during business hours. No sales pitch, no obligation.

Get a free callback

✓ Same-day callback✓ 15-min discovery call✓ No obligation

Or call 07700 195744

Serving Poole, Bournemouth, Christchurch, Wimborne, Wareham and the wider Dorset area.