Build Over Agreement: Can You Extend Over a Sewer?
When an extension needs a build over agreement: building over or within 3m of a public sewer, how to find the pipes, manholes, and what to do before you build.
6 min read5.0 from 75 Google reviews
Building Regulations Drawings
Planning permission gets your extension approved. Building regulations get it actually built safely, and signed off. We handle both, in-house, as part of the same fixed fee.
We know what's keeping you up at night
- “Wait, that's a separate thing?” Building regulations often surprise people who thought planning permission was the whole process.
- “Who's actually doing this?” You don't want your project handed off to a third party you've never spoken to.
- “Will my builder even understand these?” Drawings that don't match what's needed on site just cause delays.
Fixed-fee scope
What's included — agreed before we start
No hourly billing creep. You know exactly what you're getting and what it costs.
- ✓Building regulations drawings prepared in-house — the same team as your design, not outsourced.
- ✓Structural, insulation, ventilation and fire safety requirements covered as standard.
- ✓Drawings your builder can actually work from, not just paperwork for the file.
- ✓Coordination with a structural engineer where the project needs one.
- ✓No separate invoice — it's part of your fixed design fee, agreed up front.
How it works
Our simple, honest process
- 1
Design First
Your extension or conversion is designed and agreed before we move into regulations detail.
- 2
Regulations Drawings
We prepare the technical drawings covering structure, insulation, ventilation and fire safety.
- 3
Building Control Submission
Drawings are submitted to building control, and we handle any queries that come back.
- 4
Ready for Your Builder
You hand your builder a set of drawings they can actually build from, not guess at.
Straight talk on cost
Honest cost ranges
Real numbers, not guesswork. Build costs vary by home — our design fee is always fixed and agreed first.
Building regulations drawings
Included in your fixed design fee
Prepared in-house alongside your design and planning work — not a separate cost or a third party.
Learn first
Guides about building regulations
Plain-English answers to the questions people ask us before they book a call.
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4 min readRecent project
“We chose them because they didn't just agree with us.”
A real building regulations project, designed around how the family actually lives. Full case study coming soon.
Read more reviews →Questions homeowners ask us
Is building regulations approval the same as planning permission?
No — they're separate. Planning permission decides whether you can build; building regulations cover how it's built safely (structure, insulation, fire safety, ventilation). Most projects need both, even ones that don't need planning permission at all.
Do you handle building regulations yourselves, or outsource it?
We handle it in-house, as part of the same fixed fee as your design and planning work — not passed to a third party you've never spoken to.
Does every extension need building regulations approval?
Almost always, yes — even projects that fall under permitted development and don't need planning permission still need to meet building regulations. We build this into every project from the start.
How much do building regulations drawings cost?
They're included in your fixed design fee — we don't charge separately for them, and you won't get a surprise invoice partway through.
Where we work
Building Regulations in North WalesBuilding Regulations in AngleseyBuilding Regulations in LutonBuilding Regulations in Milton KeynesBuilding Regulations in WrexhamBuilding Regulations in BangorBuilding Regulations in ConwyBuilding Regulations in ChesterBuilding Regulations in NorthwichBuilding Regulations in CheshireBuilding Regulations in ManchesterBuilding Regulations in BoltonBuilding Regulations in WiganBuilding Regulations in TamesideBuilding Regulations in TraffordBuilding Regulations in StockportBuilding Regulations in OldhamBuilding Regulations in LiverpoolBuilding Regulations in Bedford
Not sure whether to build, wait or move?
That's exactly what the call is for. We'll be straight with you — no pressure, no jargon, no nasty surprises.