Northampton continued their 100% winning record against Dagenham with victory in their sixth meeting.
Abu Ogogo diverted Clive Platt's flick-on into his own net to give the Cobblers the lead, before Chris Hackett neatly finished for 2-0.
Kevin Langmead added a third when he headed home Ben Tozer's delivery.
The Daggers did reduce the deficit through Scott Doe, who capitalised on poor defending to drive home, but his side could not find a way back.
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Manager Aidy Boothroyd told BBC Radio Northampton:
"I thought it was scrappy today at best. There's games when you ride your luck and we did that today.
"The scoreline flattered us, but we take it because football's like that.
"We've got the consistency at home and we need to maintain it, and get it away from home now.
"I'll get the Clarke Carlisle deal sorted to get him in our side for Saturday - and we've been really pleased with Lewis Hornby, we've offered him a new contract."
Northampton Town 21 Nicholls 03 Widdowson 05 Langmead 06 Charles 12 Tozer 08 Harding 11 Hackett 22 Hornby (Guttridge - 62' ) 09 Platt (Moult - 78' ) 10 Akinfenwa 17 Robinson Substitutes 13 Snedker 04 Guttridge 07 Demontagnac 24 Turnbull 25 Dias 29 Moyo 19 Moult Dagenham & Redbridge 01 Lewington 02 Wilkinson 03 Ilesanmi 04 Doe 06 Spillane 12 Elito 15 Saunders (Caprice - 76' ) 17 Howell 19 Ogogo 07 Williams 14 Reed (Woodall - 46' ) Substitutes 30 Seabright 18 Hoyte 21 Caprice 16 Maher 24 Bingham 10 Scott 23 Woodall
Ref: Jeremy Simpson